Lines Matching +full:individual +full:- +full:port +full:- +full:switching
5 force -- enable ACPI if default was off
6 on -- enable ACPI but allow fallback to DT [arm64,riscv64]
7 off -- disable ACPI if default was on
8 noirq -- do not use ACPI for IRQ routing
9 strict -- Be less tolerant of platforms that are not
11 rsdt -- prefer RSDT over (default) XSDT
12 copy_dsdt -- copy DSDT to memory
26 If set to vendor, prefer vendor-specific driver
58 Documentation/firmware-guide/acpi/debug.rst for more information about
116 Format: <byte> or <bitmap-list>
119 Disable auto-serialization of AML methods
122 auto-serialization feature.
140 Ignore the ACPI-based watchdog interface (WDAT) and let
161 acpi_osi=! # disable all built-in OS vendor
163 acpi_osi=!! # enable all built-in OS vendor
225 For broken nForce2 BIOS resulting in XT-PIC timer.
234 as soon as the kernel's real-mode entry point is called.
272 See Documentation/sound/alsa-configuration.rst
279 align_va_addr= [X86-64]
284 CPU-intensive style benchmark, and it can vary highly in
287 32: only for 32-bit processes
288 64: only for 64-bit processes
289 on: enable for both 32- and 64-bit processes
290 off: disable for both 32- and 64-bit processes
300 Allow execve() of 32-bit applications and setting of the
302 subset of the CPUs support 32-bit EL0. When this
303 parameter is present, the set of CPUs supporting 32-bit
305 and hot-unplug operations may be restricted.
307 See Documentation/arch/arm64/asymmetric-32bit.rst for more
310 amd_iommu= [HW,X86-64]
313 fullflush - Deprecated, equivalent to iommu.strict=1
314 off - do not initialize any AMD IOMMU found in
316 force_isolation - Force device isolation for all
321 force_enable - Force enable the IOMMU on platforms known
324 pgtbl_v1 - Use v1 page table for DMA-API (Default).
325 pgtbl_v2 - Use v2 page table for DMA-API.
326 irtcachedis - Disable Interrupt Remapping Table (IRT) caching.
328 amd_iommu_dump= [HW,X86-64]
334 amd_iommu_intr= [HW,X86-64]
337 legacy - Use legacy interrupt remapping mode.
338 vapic - Use virtual APIC mode, which allows IOMMU
340 This mode requires kvm-amd.avic=1.
377 Power management functions (SPARCstation-4/5 + deriv.)
379 Disable APC CPU standby support. SPARCstation-Fox does
380 not play well with APC CPU idle - disable it if you have
387 when initialising the APIC and IO-APIC components.
388 For X86-32, this can also be used to specify an APIC
411 0 -- disable.
412 1 -- enable.
415 arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
457 audit= [KNL] Enable the audit sub-system
459 0 | off - kernel audit is disabled and can not be
461 unset - kernel audit is initialized but disabled and
463 1 | on - kernel audit is initialized and partially
476 0 - Disable the BAU.
477 1 - Enable the BAU.
478 unset - Disable the BAU.
483 baycom_par= [HW,AX25] BayCom Parallel Port AX.25 Modem
488 BayCom Serial Port AX.25 Modem (Full Duplex Mode)
493 BayCom Serial Port AX.25 Modem (Half Duplex Mode)
505 See Documentation/block/cmdline-partition.rst
518 See Documentation/admin-guide/bootconfig.rst
523 bttv.pll= See Documentation/admin-guide/media/bttv.rst
532 cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection.
551 inclusive. See arch/mips/include/asm/pgtable-bits.h
561 - foo isn't auto-mounted if you mount all cgroups in
563 - foo isn't visible as an individually mountable
565 - if foo is an optional feature then the feature is
571 Specifying "pressure" disables per-cgroup pressure
585 nosocket -- Disable socket memory accounting.
586 nokmem -- Disable kernel memory accounting.
587 nobpf -- Disable BPF memory accounting.
592 0 -- check protection applied by kernel (includes
594 1 -- check protection requested by application.
606 numbers X. Note the Linux-specific bits are not necessarily
607 stable over kernel options, but the vendor-specific
627 force such clocks to be always-on nor does it reserve
631 information, see Documentation/driver-api/clk.rst.
633 clock= [BUGS=X86-32, HW] gettimeofday clocksource override.
650 [X86-32] pit,hpet,tsc;
657 [X86-64] hpet,tsc
663 architected timer so that code using WFE-based polling
677 clocksource-wdtest.holdoff= [KNL]
683 cma=nn[MG]@[start[MG][-end[MG]]]
694 Sets the size of kernel per-numa memory area for
696 per-numa CMA altogether. And If this option is not
698 With per-numa CMA enabled, DMA users on node nid will
725 com20020= [HW,NET] ARCnet - COM20020 chipset
729 com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
733 ARCnet - COM90xx chipset (memory-mapped buffers)
756 Use the specified serial port. The options are of
762 See Documentation/admin-guide/serial-console.rst for more
772 Start an early, polled-mode console on the 8250/16550
773 UART at the specified I/O port or MMIO address,
774 switching to the matching ttyS device later.
775 MMIO inter-register address stride is either 8-bit
776 (mmio), 16-bit (mmio16), or 32-bit (mmio32).
780 the h/w is not re-initialized.
791 If the device connected to the port is not a TTY but a braille
807 syscall, or to executing "dmesg -S --raw" or to reading
826 cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver
828 <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>]
831 disable the cpuidle sub-system
837 disable the cpufreq sub-system
845 [X86] Delay for N microsec between assert and de-assert
857 Run kdump after running panic-notifiers and dumping
870 [KNL, X86-64, ARM64, RISCV] Select a region under 4G first, and
873 See Documentation/admin-guide/kdump/kdump.rst for further details.
878 start-[end] where start and end are both
880 Documentation/admin-guide/kdump/kdump.rst for an example.
883 [KNL, X86-64, ARM64, RISCV] range could be above 4G.
890 [KNL, X86-64, ARM64, RISCV] range under 4G. When crashkernel=X,high
895 low memory is needed to make sure DMA buffers for 32-bit
899 --> x86: max(swiotlb_size_or_default() + 8MiB, 256MiB)
900 --> arm64: 128MiB
901 --> riscv: 128MiB
909 [KNL] Disable crypto self-tests
917 csdlock_debug= [KNL] Enable or disable debug add-ons of cross-CPU
929 db9.dev[2|3]= [HW,JOY] Multisystem joystick support via parallel port
930 (one device per port)
931 Format: <port#>,<type>
932 See also Documentation/input/devices/joystick-parport.rst
945 [KNL] verbose locking self-tests
948 self-tests.
950 (no extra messages), setting it to -1 (all bits set)
951 will print _a_lot_ more information - normally only
986 Format: { on, no-mount, off }
988 no-mount:
993 get a -EPERM as result when trying to register files
997 Default value is set in build-time with a kernel configuration.
1009 Documentation/admin-guide/mm/hugetlbpage.rst.
1023 delayacct [KNL] Enable per-task delay accounting
1118 entries for DMA-API debugging code. One entry is
1119 required per DMA-API allocation. Use this if the
1120 DMA-API debugging code disables itself because the
1124 With this option the DMA-API debugging driver
1148 Documentation/admin-guide/hw-vuln/reg-file-data-sampling.rst
1162 Generic built-in EDID data sets are used, if one of
1167 available in Documentation/admin-guide/edid.rst. An EDID
1179 Control how the dt_cpu_ftrs device-tree binding is
1189 what data is available or for reverse-engineering.
1194 Documentation/admin-guide/dynamic-debug-howto.rst
1205 determined by stdout-path property in device tree's
1210 Start an early, polled-mode console on a Cadence
1211 (xuartps) serial port at the specified address. Only
1213 specified, the serial port must already be setup and
1221 Start an early, polled-mode console on the 8250/16550
1222 UART at the specified I/O port or MMIO address.
1223 MMIO inter-register address stride is either 8-bit
1224 (mmio) or 32-bit (mmio32 or mmio32be).
1234 Start an early, polled-mode console on a pl011 serial
1235 port at the specified address. The pl011 serial port
1238 the driver will use only 32-bit accessors to read/write
1242 Start an early console on a litex serial port at the
1243 specified address. The serial port must already be
1247 Start an early, polled-mode console on a meson serial
1248 port at the specified address. The serial port must
1253 Start an early, polled-mode console on an msm serial
1254 port at the specified address. The serial port
1259 Start an early, polled-mode console on an msm serial
1260 dm port at the specified address. The serial port
1265 Start an early, polled-mode console on a serial port
1267 specified address. The serial port must already be
1271 Start an early, polled-mode console on a serial port
1273 specified address. The serial port must already be
1277 Use RISC-V SBI (Supervisor Binary Interface) for early
1290 a correct base address of the selected UART port. The
1291 serial port must already be setup and configured.
1295 Start an early, polled-mode console on a lantiq serial
1296 (lqasc) port at the specified address. The serial port
1305 port must already be setup and configured.
1309 Start an early, polled-mode, output-only console on the
1314 Start an early, polled-mode console on the
1315 Armada 3700 serial port at the specified
1316 address. The serial port must already be setup
1320 Start an early, polled-mode console on a Qualcomm
1321 Generic Interface (GENI) based serial port at the
1322 specified address. The serial port must already be
1328 coherent non-x86 systems that use system memory for
1335 address must be provided, and the serial port must
1356 Only one of vga, serial, or usb debug port can
1362 replacing ttySn with an I/O port address, like this:
1364 You can find the port for a given device in
1366 2: uart:ST16650V2 port:00001008 irq:18 ...
1428 attribute is added to range 0x100000000-0x180000000 and
1429 0x10a0000000-0x1120000000.
1433 range 0x240000000-0x43fffffff.
1445 Documentation/admin-guide/acpi/ssdt-overlays.rst for details.
1460 via a serial port see kgdboc_earlycon instead.
1462 elanfreq= [X86-32]
1470 See Documentation/admin-guide/kdump/kdump.rst for details.
1486 0 -- permissive (log only, no denials).
1487 1 -- enforcing (deny and log).
1519 See also Documentation/fault-injection/.
1523 See Documentation/admin-guide/sysctl/net.rst for
1527 See Documentation/admin-guide/blockdev/floppy.rst.
1530 [IA-64] Avoid check_sal_cache_flush which may hang on
1535 forcepae [X86-32]
1571 ftrace_filter=[function-list]
1573 tracer at boot up. function-list is a comma-separated
1578 ftrace_notrace=[function-list]
1580 function-list. This list can be changed at run time
1584 ftrace_graph_filter=[function-list]
1587 function-list is a comma-separated list of functions
1591 ftrace_graph_notrace=[function-list]
1593 function-list. This list is a comma-separated list of
1613 off -- Don't create device links from firmware info.
1614 permissive -- Create device links from firmware info
1617 on -- Create device links from firmware info and use it
1619 rpm -- Like "on", but also use to order runtime PM.
1632 strict -- Default. Continue waiting on consumers to
1634 timeout -- Give up waiting on consumers and call
1642 support via parallel port (up to 5 devices per port)
1643 Format: <port#>,<pad1>,<pad2>,<pad3>,<pad4>,<pad5>
1644 See also Documentation/input/devices/joystick-parport.rst
1648 gart_fix_e820= [X86-64] disable the fix e820 for K8 GART
1672 gcov_persist= [GCOV] When non-zero (default), profiling data for
1682 gpio-mockup.gpio_mockup_ranges
1685 gpio-mockup.gpio_mockup_named_lines
1717 against bounds-checking flaws in the kernel's
1723 [KNL] Should the hard-lockup detector generate
1729 for 64-bit NUMA, off otherwise.
1732 hcl= [IA-64] SGI's Hardware Graph compatibility layer
1739 corresponding firmware-first mode error processing
1749 during restoration read-only).
1775 hpet= [X86-32,HPET] option to control HPET usage
1792 number of pages to allocate per-node can be specified.
1793 See also Documentation/admin-guide/mm/hugetlbpage.rst.
1804 Documentation/admin-guide/mm/hugetlbpage.rst.
1815 boot-time allocation of gigantic hugepages is skipped.
1843 by the CONFIG_BOOTPARAM_HUNG_TASK_PANIC build-time
1849 hvc_iucv_allow= [S390] Comma-separated list of z/VM user IDs.
1865 [HW] Enable printing of interrupt data from the KBD port
1866 (disabled by default, and as a pre-condition
1868 i8042.direct [HW] Put keyboard port into non-translated mode
1872 i8042.noaux [HW] Don't check for auxiliary (== mouse) port
1873 i8042.nokbd [HW] Don't check/create keyboard port
1875 for the AUX port
1882 suspend-to-ram transitions, only during s2r
1890 i8042.kbdreset [HW] Reset device connected to KBD port
1906 -1 -- never invert brightness
1907 0 -- machine default
1908 1 -- force brightness inversion
1922 idle=nomwait: Disable mwait for CPU C-states
1950 legacy only accept legacy-NaN binaries, if supported
1952 2008 only accept 2008-NaN binaries, if supported
1961 'relaxed' straps the emulator for both legacy-NaN and
1962 2008-NaN, whereas 'strict' enables legacy-NaN only on
1971 Ignore loglevel setting - this will print /all/
2038 Formats: { "ima" | "ima-ng" | "ima-ngv2" | "ima-sig" |
2039 "ima-sigv2" }
2040 Default: "ima-ng"
2073 stuff: Deploy RSB-fill mitigation when retpoline is
2078 Documentation/admin-guide/hw-vuln/indirect-target-selection.rst
2089 initcall_blacklist= [KNL] Do not execute a comma-separated list of
2090 initcall functions. Useful for debugging built-in
2135 0 -- basic integrity auditing messages. (Default)
2136 1 -- additional integrity auditing messages.
2164 could harm performance of some high-throughput
2173 1 to 9 specify maximum depth of C-state.
2182 algorithms for p-state selection. There are two
2183 P-state selection algorithms provided by
2186 on whether or not the hardware managed P-states
2193 used along with the hardware-managed P-states (HWP)
2197 in favor of acpi-cpufreq. Forcing the intel_pstate driver
2198 instead of acpi-cpufreq may disable platform features, such
2200 P-States information being indicated to OSPM and therefore
2203 or on platforms that use pcc-cpufreq instead of acpi-cpufreq.
2216 Allow per-logical-CPU P-State performance control limits using
2219 intremap= [X86-64, Intel-IOMMU]
2224 BIOS x2APIC opt-out request will be ignored
2248 0 - Try to allocate a 32-bit DMA address first, before
2250 1 - Allocate directly from the full usable range,
2252 greater than 32-bit addressing.
2256 0 - Lazy mode.
2262 1 - Strict mode.
2265 unset - Use value of CONFIG_IOMMU_DEFAULT_DMA_{LAZY,STRICT}.
2267 legacy driver-specific options takes precedence.
2272 0 - Use IOMMU translation for DMA.
2273 1 - Bypass the IOMMU for DMA.
2274 unset - Use value of CONFIG_IOMMU_DEFAULT_PASSTHROUGH.
2276 io7= [HW] IO7 for Marvel-based Alpha systems
2282 Standard port 0x80 based delay
2284 Alternate port 0xed based delay (needed on some systems)
2291 See Documentation/admin-guide/nfs/nfsroot.rst.
2315 Enables support for pseudo-NMIs in the kernel. This
2334 [Deprecated - use cpusets instead]
2335 Format: [flag-list,]<cpu-list>
2350 so to protect individual CPUs the 'cpumask' file has to
2366 "number of CPUs in system - 1".
2392 The format of <cpu-list> is described above.
2396 ivrs_ioapic [HW,X86-64]
2397 Provide an override to the IOAPIC-ID<->DEVICE-ID
2401 For example, to map IOAPIC-ID decimal 10 to
2407 * To map IOAPIC-ID decimal 10 to PCI device 00:14.0
2410 * To map IOAPIC-ID decimal 10 to PCI segment 0x1 and
2414 ivrs_hpet [HW,X86-64]
2415 Provide an override to the HPET-ID<->DEVICE-ID
2419 For example, to map HPET-ID decimal 10 to
2425 * To map HPET-ID decimal 0 to PCI device 00:14.0
2428 * To map HPET-ID decimal 10 to PCI segment 0x1 and
2432 ivrs_acpihid [HW,X86-64]
2433 Provide an override to the ACPI-HID:UID<->DEVICE-ID
2437 For example, to map UART-HID:UID AMD0020:0 to
2443 * To map UART-HID:UID AMD0020:0 to PCI segment is 0,
2446 * To map UART-HID:UID AMD0020:0 to PCI segment 0x1 and
2467 kernelcore= [KNL,X86,IA-64,PPC]
2470 the kernel for non-movable allocations. The requested
2480 subsystem. Note that allocations like PTEs-from-HighMem
2488 for non-movable allocations and remaining memory is used
2492 kgdbdbgp= [KGDB,HW] kgdb over EHCI usb debug port.
2495 port as it is probed via PCI. The poll interval is
2497 each poll cycle to the debug port in case you need
2499 gdb or control-c on the dbgp connection. When
2500 not using this parameter you use sysrq-g to break into
2505 or a supported polling keyboard driver (non-usb).
2532 Configure the RouterBoard 532 series on-chip
2535 kmemleak= [KNL] Boot-time kmemleak enable/disable
2541 kprobe_event=[probe-list]
2543 The probe-list is a semicolon delimited list of probe
2573 execution by eliminating the write-protection faults
2618 back to huge pages. If the value is a non-zero N, KVM will
2623 kvm-amd.nested= [KVM,AMD] Control nested virtualization feature in
2626 kvm-amd.npt= [KVM,AMD] Control KVM's use of Nested Page Tables,
2627 a.k.a. Two-Dimensional Page Tables. Default is 1
2631 kvm-arm.mode=
2636 nvhe: Standard nVHE-based mode, without support for
2639 protected: nVHE-based mode with support for guests whose
2642 nested: VHE-based mode with support for nested
2651 kvm-arm.vgic_v3_group0_trap=
2652 [KVM,ARM] Trap guest accesses to GICv3 group-0
2655 kvm-arm.vgic_v3_group1_trap=
2656 [KVM,ARM] Trap guest accesses to GICv3 group-1
2659 kvm-arm.vgic_v3_common_trap=
2663 kvm-arm.vgic_v4_enable=
2675 kvm-intel.ept= [KVM,Intel] Control KVM's use of Extended Page Tables,
2676 a.k.a. Two-Dimensional Page Tables. Default is 1
2680 kvm-intel.emulate_invalid_guest_state=
2682 state. Ignored if kvm-intel.enable_unrestricted_guest=1,
2688 kvm-intel.flexpriority=
2693 kvm-intel.nested=
2697 kvm-intel.unrestricted_guest=
2703 kvm-intel.vmentry_l1d_flush=[KVM,Intel] Mitigation for L1 Terminal Fault
2704 CVE-2018-3620.
2715 kvm-intel.vpid= [KVM,Intel] Control KVM's use of Virtual Processor
2735 on - enable the interface for the mitigation
2800 For details see: Documentation/admin-guide/hw-vuln/l1tf.rst
2806 lapic [X86-32,APIC] Enable the local APIC even if BIOS
2810 value for LAPIC timer one-shot implementation. Default
2833 libata.force= [LIBATA] Force configurations. The format is a comma-
2834 separated list of "[ID:]VAL" where ID is PORT[.DEVICE].
2835 PORT and DEVICE are decimal numbers matching port, link
2838 omitted, the last PORT and DEVICE values are used. If
2843 the port and all links and devices behind it. DEVICE
2845 first fan-out link behind PMP device. It does not
2855 Any ID with matching PORT is used.
2859 * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7].
2866 * rstonce: only attempt one reset during hot-unplug
2929 lockd.nlm_tcpport=N [NFS] Assign TCP port.
2935 lockd.nlm_udpport=M [NFS] Assign UDP port.
2948 Set the number of locking read-acquisition kthreads.
2953 Set the number of locking write-acquisition kthreads.
2956 Set time (s) after boot for CPU-hotplug testing.
2959 Set time (s) between CPU-hotplug operations, or
2960 zero to disable CPU-hotplug testing.
2963 Set task-shuffle interval (jiffies). Shuffling
2964 tasks allows some CPUs to go into dyntick-idle
2969 is useful for hands-off automated testing.
2985 Run the write-side locktorture kthreads at
2986 sched_set_fifo() real-time priority.
3006 7 (KERN_DEBUG) debug-level messages
3016 logo.nologo [FB] Disables display of the built-in Linux logo.
3022 lp=port[,port...] lp=none,parport0 (lp0 not configured, lp1 uses
3023 lp=reset first parallel port). 'lp=0' disables the
3029 lp0. A port specification may be 'none' to skip
3032 port specification list means that device IDs
3033 from each port should be examined, to see if
3034 an IEEE 1284-compliant printer is attached; if
3040 time-consuming boot-time autodetection (up to 250 ms per
3061 machvec= [IA-64] Force the use of a particular machine-vector
3067 Example: machtype=lemote-yeeloong-2f-7inch
3069 max_addr=nn[KMG] [KNL,BOOT,IA-64] All physical memory greater
3082 (loop.max_loop) unconditionally pre-created at init time. The default
3085 devices can be requested on-demand with the
3086 /dev/loop-control interface.
3088 mce [X86-32] Machine Check Exception
3090 mce=option [X86-64] See Documentation/arch/x86/x86_64/boot-options.rst
3093 See Documentation/admin-guide/md.rst.
3100 Control mitigation for the Micro-architectural Data
3115 full - Enable MDS mitigation on vulnerable CPUs
3116 full,nosmt - Enable MDS mitigation and disable
3118 off - Unconditionally disable MDS mitigation
3120 On TAA-affected machines, mds=off can be prevented by
3129 For details see: Documentation/admin-guide/hw-vuln/mds.rst
3143 [ARC,MICROBLAZE] - the limit applies only to low memory,
3146 [ARM64] - only limits memory covered by the linear
3159 [ARM,MIPS] - override the memory layout reported by
3166 mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
3173 per-device physically contiguous DMA buffers.
3181 See Documentation/admin-guide/mm/memory-hotplug.rst.
3206 Example: Exclude memory from 0x18690000-0x1869ffff
3220 memmap=<size>%<offset>-<oldtype>+<newtype>
3222 from <oldtype> to <newtype>. If "-<oldtype>" is left
3237 repeatable BIOS-originated corruption always
3281 mem_encrypt= [X86-64] AMD Secure Memory Encryption (SME) control
3287 Refer to Documentation/virt/kvm/x86/amd-memory-encryption.rst
3291 s2idle - Suspend-To-Idle
3292 shallow - Power-On Suspend or equivalent (if supported)
3293 deep - Suspend-To-RAM or equivalent (if supported)
3294 See Documentation/admin-guide/pm/sleep-states.rst.
3299 mfgpt_irq= [IA-32] Specify the IRQ to use for the
3300 Multi-Function General Purpose Timers on AMD Geode
3303 mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when
3315 min_addr=nn[KMG] [KNL,BOOT,IA-64] All physical memory below this
3322 0 - The attached screen is the 3.5" TFT
3323 1 - The attached screen is the 7" TFT
3324 2 - The VGA Shield is attached (1024x768)
3328 b - Enable backlight. The TFT backlight pin will be
3332 c - Enable the s3c camera interface.
3333 t - Reserved for enabling touchscreen support. The
3335 kernel as of 2.6.30, a preliminary port can be found
3337 https://repo.or.cz/w/linux-2.6/mini2440.git
3342 arch-independent options, each of which is an
3343 aggregation of existing arch-specific options.
3372 ssbd=force-off [ARM64]
3385 have other ways of avoiding SMT-based attacks.
3420 full - Enable mitigation on vulnerable CPUs
3422 full,nosmt - Enable mitigation and disable SMT on
3425 off - Unconditionally disable mitigation
3438 Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst
3468 module_blacklist= [KNL] Do not load a comma-separated list of
3482 movablecore= [KNL,X86,IA-64,PPC]
3493 movable_node [KNL] Boot-time switch to make hotplugable memory
3500 Format: <name>,<region-number>,<size>,<offset>
3503 <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
3511 See arch/arm/mach-s3c/mach-jive.c
3547 something different and driver-specific.
3576 [NFS] set the TCP port on which the NFSv4 callback
3580 [NFS] enable 64-bit inode numbers.
3581 If zero, the NFS client will fake up a 32-bit inode
3583 of returning the full 64-bit number.
3584 The default is to return 64-bit inode numbers.
3619 [NFS4] Specify an additional fixed unique ident-
3650 driver. A non-zero value sets the minimum interval
3655 server-to-server copies for which this server is
3667 server-to-server copy, knfsd temporarily mounts
3674 See Documentation/admin-guide/nfs/nfsroot.rst.
3676 nfsroot= [NFS] nfs root filesystem for disk-less boxes.
3677 See Documentation/admin-guide/nfs/nfsroot.rst.
3680 See Documentation/admin-guide/nfs/nfsroot.rst.
3684 NMI stack-backtrace request.
3693 0 - turn hardlockup detector in nmi_watchdog off
3694 1 - turn hardlockup detector in nmi_watchdog on
3706 no387 [BUGS=X86-32] Tells the kernel to use the 387 maths
3710 no4lvl [RISCV] Disable 4-level and 5-level paging modes. Forces
3711 kernel to use 3-level paging instead.
3713 no5lvl [X86-64,RISCV] Disable 5-level paging mode. Forces
3714 kernel to use 4-level paging instead.
3717 caches in the slab allocator. Saves per-node memory,
3754 no_entry_flush [PPC] Don't flush the L1-D cache when entering the kernel.
3756 noexec [IA-64]
3758 noexec32 [X86-64]
3759 This affects only 32-bit executables.
3760 noexec32=on: enable non-executable mappings (default)
3762 noexec32=off: disable non-executable mappings
3773 nofxsr [BUGS=X86-32] Disables x86 floating point extended
3775 legacy floating-point registers on task switch.
3777 nohalt [IA-64] Tells the kernel not to use the power saving
3779 power-consumption. On the positive side, it reduces
3780 interrupt wake-up latency, which may improve performance
3782 real-time systems.
3792 compared. However, if this command-line option is
3833 nointremap [X86-64, Intel-IOMMU] Do not enable interrupt
3835 [Deprecated - use intremap=off]
3837 nointroute [IA-64]
3841 noiotrap [SH] Disables trapped I/O port accesses.
3843 noirqdebug [X86-32] Disables the code which attempts to detect and
3848 nojitter [IA-64] Disables jitter checking for ITC timers.
3855 no-kvmapf [X86,KVM] Disable paravirtualized asynchronous page
3858 no-kvmclock [X86,KVM] Disable paravirtualized KVM clock driver
3860 nolapic [X86-32,APIC] Do not enable or use the local APIC.
3862 nolapic_timer [X86-32,APIC] Do not use the local APIC timer.
3864 nomca [IA-64] Disable machine check abort handling
3866 nomce [X86-32] Disable Machine Check Exception
3868 nomfgpt [X86-32] Disable Multi-Function General Purpose
3874 not load if they could possibly displace the pre-
3877 perform display-mode changes or accelerated rendering.
3890 nopcid [X86-64] Disable the PCID cpu feature.
3895 nopti [X86-64]
3911 noreplace-smp [X86-32,SMP] Don't replace SMP instructions
3917 nosbagart [IA-64]
3919 no-scroll [VGA] Disables scrollback.
3920 This is required for the Braillex ib80-piezo Braille
3923 nosgx [X86-64,SGX] Disables Intel SGX kernel support.
3943 nosoftlockup [KNL] Disable the soft-lockup detector.
3948 nospectre_bhb [ARM64] Disable all mitigations for Spectre-BHB (branch
3961 no-steal-acc [X86,PV_OPS,ARM64,PPC/PSERIES] Disable paravirtualized
3971 [PPC] Don't flush the L1-D cache after accessing user data.
3984 no-vmw-sched-clock
3989 soft-lockup and NMI watchdog (hard-lockup).
3993 nox2apic [X86-64,APIC] Do not enable x2APIC mode.
4001 enabling legacy floating-point and sse state.
4027 nptcg= [IA-64] Override max number of concurrent global TLB
4036 n. So during boot up some boot time memory for per-cpu
4037 variables need be pre-allocated for later physical cpu
4052 See Documentation/admin-guide/sysctl/vm.rst for details.
4055 See Documentation/core-api/debugging-via-ohci1394.rst for more
4070 onenand.bdry= [HW,MTD] Flex-OneNAND Boundary Configuration
4074 boundary - index of last SLC block on Flex-OneNAND.
4076 lock - Configure if Flex-OneNAND boundary should be locked.
4090 running on a platform with a direct-mapped memory-side
4096 page_owner= [KNL] Boot-time page_owner enabling option.
4102 page_poison= [KNL] Boot-time parameter changing the state of
4129 See Documentation/admin-guide/tainted-kernels.rst for
4150 parkbd.port= [HW] Parallel port number the keyboard adapter is
4153 parkbd.mode= [HW] Parallel port keyboard adapter mode of operation,
4165 settings on that particular port), or 'nofifo'
4172 Configure VIA parallel port to operate in
4175 up parallel port mode and sets it to spp.
4181 Set to non-zero to probe primary and secondary ISA
4182 port ranges on PCI systems where no PCI PATA device
4187 Set to non-zero if a chip is present that snoops speed
4204 IORDY enable mask. Set individual bits to allow IORDY
4228 PIO mode mask for autospeed devices. Set individual
4235 Set to non-zero to probe tertiary and further ISA
4236 port ranges on PCI systems. Disabled by default.
4244 of individual ports can be disabled by setting the
4246 the first port in the list above (0x1f0), and so on.
4251 Set to non-zero to probe QDI controllers. By default
4256 Set to non-zero to probe Winbond controllers. Use
4257 the standard I/O port (0x130) if 1, otherwise the
4258 value given is the I/O port to use (typically 0x1b0).
4264 Supported PIO mode mask. Set individual bits to allow
4303 bios [X86-32] force use of PCI BIOS, don't access
4305 has a non-standard PCI host bridge.
4306 nobios [X86-32] disallow use of PCI BIOS, only direct
4311 Mechanism 1 (config address in IO port 0xCF8,
4312 data in IO port 0xCFC, both 32-bit).
4314 Mechanism 2 (IO port 0xCF8 is an 8-bit port for
4315 the function, IO port 0xCFA, also 8-bit, sets
4317 through ports 0xC000-0xCFFF).
4324 root domains (aka PCI segments, in ACPI-speak).
4332 disable the use of MSI interrupts system-wide.
4337 primary IO-APIC for bridges that cannot disable
4344 biosirq [X86-32] Use PCI BIOS calls to get the interrupt
4368 F0000h-100000h range.
4373 assign-busses [X86] Always assign all PCI bus
4394 <linux-pci@vger.kernel.org>.
4398 a bug to <linux-pci@vger.kernel.org>.
4410 bfsort Sort PCI devices into breadth-first order.
4413 nobfsort Don't sort PCI devices into breadth-first order.
4415 tuning and use the BIOS-configured MPS defaults.
4425 configuration allows peer-to-peer DMA between
4428 that hot-added devices will work.
4443 A PCI-PCI bridge can be specified if resource
4449 for 4096-byte alignment.
4451 end-to-end CRC checking). Only effective if
4482 noats [PCIE, Intel-IOMMU, AMD-IOMMU]
4486 port.
4513 pcie_ports= [PCIE] PCIe port services handling:
4518 dpc-native Use native PCIe service for DPC only. May
4523 pcie_port_pm= [PCIE] PCIe port power management handling:
4535 Keep all power-domains already enabled by bootloader on,
4552 pirq= [SMP,APIC] Manual mp-table setup
4553 See Documentation/arch/x86/i386/IO-APIC.rst.
4555 plip= [PPT,NET] Parallel port network link
4557 See also Documentation/admin-guide/parport.rst.
4559 pmtmr= [X86] Manual setup of pmtmr I/O Port.
4576 CONFIG_PNP_DEBUG_MESSAGES option). Change at run-time
4585 { on | off | curr | res | no-curr | no-res }
4594 Ranges are in pairs (I/O port base and size).
4605 Format: <port>,<port>....
4625 none - Limited to cond_resched() calls
4626 voluntary - Limited to cond_resched() and might_sleep() calls
4627 full - Any section that isn't explicitly preempt disabled
4630 print-fatal-signals=
4636 coredump - etc.
4639 you might want to try "ulimit -i unlimited".
4651 or lockdep-detected issues (only if lock debug is on).
4660 on - unlimited logging to /dev/kmsg from userspace
4661 off - logging to /dev/kmsg disabled
4662 ratelimit - ratelimit the logging
4673 - 'always': traditional behavior always allows mem overrides.
4674 - 'ptrace': only allow mem overrides for active ptracers.
4675 - 'never': never allow mem overrides.
4679 Limit processor to maximum C-state
4683 Ignore the _CST method to determine C-states,
4690 Param: "schedule" - profile schedule points.
4691 Param: "kvm" - profile VM exits.
4692 Param: <number> - step/bucket size as a power of 2 for
4721 pti= [X86-64] Control Page Table Isolation of user and
4726 on - unconditionally enable
4727 off - unconditionally disable
4728 auto - kernel detects whether your CPU model is
4734 [KNL] Number of legacy pty's. Overwrites compiled-in
4746 See Documentation/admin-guide/md.rst.
4749 See Documentation/admin-guide/blockdev/ramdisk.rst.
4768 cross-syscall address exposures. This is only
4774 ras=option[,option,...] [KNL] RAS-specific options
4780 rcu_nocbs[=cpu-list]
4785 enable the no-callback CPU mode, which prevents
4790 "p" for RCU-preempt, "s" for RCU-sched, and "g"
4794 and real-time workloads. It can also improve
4798 list of CPUs is set to no-callback mode from boot.
4802 no-callback mode from boot but the mode may be
4813 This improves the real-time response for the
4830 RCU grace-period cleanup.
4834 RCU grace-period initialization.
4838 RCU grace-period pre-initialization, that is,
4839 the propagation of recent CPU-hotplug changes up
4843 Set delay from grace-period initialization to
4856 soliciting quiescent-state help from
4868 Set the SCHED_FIFO priority of the RCU per-CPU
4871 and for the RCU grace-period kthreads (rcu_bh,
4873 set, valid values are 1-99 and the default is 1
4874 (the least-favored priority). Otherwise, when
4875 RCU_BOOST is not set, valid values are 0-99 and
4876 the default is zero (non-realtime operation).
4881 On callback-offloaded (rcu_nocbs) CPUs,
4884 use of the ->nocb_bypass list. However, in the
4885 common non-flooded case, RCU queues directly to
4886 the main ->cblist in order to avoid the extra
4887 overhead of the ->nocb_bypass list and its lock.
4889 a single jiffy, RCU pre-queues the callbacks into
4890 the ->nocb_bypass queue. The definition of "too
4899 batch limiting is re-enabled.
4903 RCU's force-quiescent-state scan will aggressively
4911 Set the page-cache refill delay (in milliseconds)
4912 in response to low-memory conditions. The range
4916 Set the shift-right count to use to compute
4917 the callback-invocation batch limit bl from
4924 Please note that this callback-invocation batch
4925 limit applies only to non-offloaded callback
4934 cache-to-cache transfer latencies.
4940 and for NUMA systems with large remote-access
4956 the wakeup overhead on the global grace-period
4958 each group's NOCB grace-period kthread.
4961 Cause the grace-period kthread to get an extra
4963 it should at force-quiescent-state time.
4976 this specifies an rcu_read_unlock()-time delay
4980 of RCU-protected pointers after the relevant
4990 per-CPU rcuc kthreads. Defaults to a non-zero
5000 grace-period primitives such as call_rcu().
5011 grace-period primitives.
5014 Set test-start holdoff period. The purpose of
5032 Test the double-argument variant of kfree_rcu().
5034 rcuscale.kfree_rcu_test_single, both the single-
5035 and double-argument variants are tested.
5038 Test the single-argument variant of kfree_rcu().
5040 rcuscale.kfree_rcu_test_double, both the single-
5041 and double-argument variants are tested.
5055 does not affect the data-collection interval,
5060 Set number of RCU readers. The value -1 selects
5062 "n" less than -1 selects N-n+1, where N is again
5063 the number of CPUs. For example, -2 selects N
5064 (the number of CPUs), -3 selects N+1, and so on.
5065 A value of "n" less than or equal to -N selects
5078 complete. This is useful for hands-off automated
5085 Write-side holdoff between grace periods,
5090 Additional write-side holdoff between grace
5108 for RCU grace-period forward-progress testing
5115 Specify the fraction of a CPU-stall-warning
5116 period to do tight-loop forward-progress testing.
5120 forward-progress tests.
5124 need_resched() during tight-loop forward-progress
5128 Use conditional/asynchronous update-side
5132 Use expedited update-side primitives, if available.
5135 Use normal (non-expedited) asynchronous
5136 update-side primitives, if available.
5139 Use normal (non-expedited) synchronous
5140 update-side primitives, if available. If all
5144 they are all non-zero.
5152 Leak an RCU-protected pointer out of the reader.
5167 Set number of RCU callback-offload togglers.
5172 callback-offload toggling attempts.
5175 Set number of RCU readers. The value -1 selects
5176 N-1, where N is the number of CPUs. A value
5177 "n" less than -1 selects N-n-2, where N is again
5178 the number of CPUs. For example, -2 selects N
5179 (the number of CPUs), -3 selects N+1, and so on.
5182 Enable debug-object double-call_rcu() testing.
5185 Set time (s) after boot for CPU-hotplug testing.
5188 Set time (jiffies) between CPU-hotplug operations,
5189 or zero to disable CPU-hotplug testing.
5192 Set the number of read-then-exit kthreads used
5194 task-exit processing.
5197 The number of times in a given read-then-exit
5198 episode that a set of read-then-exit kthreads
5203 read-then-exit testing episodes.
5206 Set task-shuffle interval (s). Shuffling tasks
5207 allows some CPUs to go into dyntick-idle mode
5212 is useful for hands-off automated testing.
5221 any other stall-related activity. Note that
5227 in scheduling-while-atomic splats.
5240 grace-period kthread to test RCU CPU stall
5260 Duration (s) of each individual boost test.
5266 Test RCU's dyntick-idle handling. See also the
5315 Use expedited grace-period primitives, for
5319 real-time latency, and degrade energy efficiency.
5323 Use only normal grace-period primitives,
5326 real-time latency, CPU utilization, and
5328 increased grace-period latency. This parameter
5335 only normal grace-period primitives. No effect
5341 post-boot attempt at an expedited RCU grace
5342 period to instead use normal non-expedited
5343 grace-period processing.
5349 a single callback queue. This switching only
5351 set to the default value of -1.
5354 Set the minimum number of callback-queuing-time
5355 lock-contention events per jiffy required to
5356 cause the RCU Tasks flavors to switch to per-CPU
5357 callback queuing. This switching only occurs
5359 the default value of -1.
5364 of -1 allows this to be automatically (and
5372 number avoids disturbing real-time workloads,
5377 cancel laziness on that CPU. Use -1 to disable
5387 only printed prior to the stall-warning message
5443 force - Override the decision by the kernel to hide the
5450 Turn on/off individual RDT features. List is:
5471 Set test-start holdoff period. The purpose of
5480 but the default has already reduced the per-pass
5485 Set number of readers. The default value of -1
5494 Set the read-side critical-section duration,
5498 Specify the read-protection implementation to test.
5517 See Documentation/admin-guide/cgroup-v1/cpusets.rst.
5525 reservetop= [X86-32]
5542 See Documentation/power/swsusp-and-swap-files.rst
5557 AMD-based UNRET and IBPB mitigations alone do not stop
5559 sibling threads. For that reason, STIBP is used on pro-
5563 off - no mitigation
5564 auto - automatically select a migitation
5565 auto,nosmt - automatically select a mitigation,
5569 ibpb - On AMD, mitigate short speculation
5574 ibpb,nosmt - Like "ibpb" above but will disable SMT
5578 unret - Force enable untrained return thunks,
5579 only effective on AMD f15h-f17h based
5581 unret,nosmt - Like unret, but will disable SMT when STIBP
5616 ro [KNL] Mount root device read-only on boot
5619 on Mark read-only kernel memory as read-only (default).
5620 off Leave read-only kernel memory writable for debugging.
5621 full Mark read-only kernel memory and aliases as read-only
5625 Enable the uart passthrough on the designated usb port
5627 debug-uart get routed to the D+ and D- pins of the usb
5628 port and the regular usb controller gets disabled.
5633 block/early-lookup.c for details.
5658 rw [KNL] Mount root device read-write on boot
5710 to 10 seconds for built-in smp_call_function()
5717 that requesting even small non-zero numbers of
5724 The default of -1 specifies a number of kthreads
5729 test before initiating CPU-hotplug operations.
5733 CPU-hotplug operations. Specifying zero (which
5734 is the default) disables CPU-hotplug operations.
5740 Non-zero values are useful for automated tests.
5763 "wait" parameter. A value of -1 selects the
5764 default if all other weights are -1. However,
5766 value of -1 will instead select a weight of zero.
5771 non-zero "wait" parameter. See weight_single.
5784 non-zero "wait" parameter. See weight_single
5796 non-zero "wait" parameter. See weight_single
5803 0 -- disable. (may be 1 via CONFIG_CMDLINE="skew_tick=1"
5804 1 -- enable.
5815 0 -- disable.
5816 1 -- enable.
5819 serialnumber [BUGS=X86-32]
5821 sev=option[,option...] [X86-64] See Documentation/arch/x86/x86_64/boot-options.rst
5829 to set it to "all" by meaning -- no limit here.
5835 simeth= [IA-64]
5910 using the csdlock_debug- kernel parameter.
5915 system. By default, let CSD-lock acquisition
5917 for this value provides a 5-minute timeout.
5919 smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices
5920 smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port
5921 smsc-ircc2.ircc_sir= [HW] SIR base I/O port
5922 smsc-ircc2.ircc_fir= [HW] FIR base I/O port
5923 smsc-ircc2.ircc_irq= [HW] IRQ line
5924 smsc-ircc2.ircc_dma= [HW] DMA channel
5925 smsc-ircc2.ircc_transceiver= [HW] Transceiver type:
5935 Default: -1 (no limit)
5938 [KNL] Should the soft-lockup detector generate panics.
5941 A value of 1 instructs the soft-lockup detector
5942 to panic the machine when a soft-lockup occurs. It is
5945 respective build-time switch to that functionality.
5948 [KNL] Should the soft-lockup detector generate
5953 See Documentation/admin-guide/laptops/sonypi.rst
5960 on - (default) Enable the HW or SW mitigation
5962 off - Disable the mitigation.
5969 on - unconditionally enable, implies
5971 off - unconditionally disable, implies
5973 auto - kernel detects whether your CPU model is
5992 retpoline - replace indirect branches
5993 retpoline,generic - Retpolines
5994 retpoline,lfence - LFENCE; indirect branch
5995 retpoline,amd - alias for retpoline,lfence
5996 eibrs - Enhanced/Auto IBRS
5997 eibrs,retpoline - Enhanced/Auto IBRS + Retpolines
5998 eibrs,lfence - Enhanced/Auto IBRS + LFENCE
5999 ibrs - use IBRS to protect kernel
6009 on - Unconditionally enable mitigations. Is
6012 off - Unconditionally disable mitigations. Is
6015 prctl - Indirect branch speculation is enabled,
6021 - Like "prctl" above, but only STIBP is
6023 always when switching between different user
6027 - Same as "prctl" above, but all seccomp
6032 - Like "seccomp" above, but only STIBP is
6034 always when switching between different
6037 auto - Kernel selects the mitigation depending on
6048 off - Disable mitigation
6049 microcode - Enable microcode mitigation only
6050 safe-ret - Enable sw-only safe RET mitigation (default)
6051 ibpb - Enable mitigation by issuing IBPB on
6053 ibpb-vmexit - Issue IBPB only on VMEXIT
6054 (cloud-specific mitigation)
6079 on - Unconditionally disable Speculative Store Bypass
6080 off - Unconditionally enable Speculative Store Bypass
6081 auto - Kernel detects whether the CPU model contains an
6087 prctl - Control Speculative Store Bypass per thread
6091 seccomp - Same as "prctl" above, but all seccomp threads
6099 on,auto - On Power8 and Power9 insert a store-forwarding
6103 off - No action.
6122 off - not enabled
6124 warn - the kernel will emit rate-limited warnings
6132 fatal - the kernel will send SIGBUS to applications
6137 ratelimit:N -
6157 Certain CPUs are vulnerable to an MDS-like
6177 This kernel-boot parameter defaults to 128,
6178 but takes effect only when the low-order four
6195 instead of the compile-time CONFIG_NR_CPUS.
6199 grace-period sequence counter wrap for the
6200 srcu_data structure's ->srcu_gp_seq_needed field.
6215 Specifies the number of no-delay instances
6222 Specifies the per-grace-period phase, number of
6223 non-sleeping polls of readers. Beyond this limit,
6229 Specifies number of microseconds of non-sleeping
6230 delay between each non-sleeping poll of readers.
6233 Specifies the number of update-side contention
6238 set for contention-based conversions to occur.
6248 force-on: Unconditionally enable mitigation for
6250 force-off: Unconditionally disable mitigation for
6273 stacktrace_filter=[function-list]
6275 will trace at boot up. function-list is a comma-separated
6283 Set the STI (builtin display/keyboard on the HP-PARISC
6285 as the initial boot-console.
6317 originate from a privileged port (i.e. a port in the
6323 maximum port values.
6345 to global on non-NUMA machines)
6368 swiotlb= [ARM,IA-64,PPC,MIPS,X86]
6370 <int> -- Number of I/O TLB slabs
6371 <int> -- Second integer after comma. Number of swiotlb
6374 force -- force using of bounce buffers even if they
6376 noforce -- Never use bounce buffers (for debugging)
6391 Ignore sysrq setting - this boot parameter will
6399 cache size. See Documentation/networking/ip-sysctl.rst
6406 Specify "mem" (for Suspend-to-RAM) or "standby" (for
6411 wakeup-capable RTC alarm.
6417 -1: disable all active trip points in all thermal zones
6421 -1: disable all critical trip points in all thermal zones
6428 -1: disable all passive trip points
6434 <deci-seconds>: poll all this frequency
6456 Prevent the CPU-hotplug component of torturing
6460 Dump the ftrace buffer at torture-test shutdown,
6464 with rotating-rust storage.
6469 disables verbose-printk() sleeping.
6472 Duration of each verbose-printk() sleep in jiffies.
6490 https://trustedcomputinggroup.org/resource/pc-client-platform-tpm-profile-ptp-specification/
6528 local - Use the per CPU time stamp counter
6532 global - Event time stamps are synchronize across
6535 counter - Simple counting of events (1, 2, ..)
6539 uptime - Use jiffies as the time stamp.
6540 perf - Use the same clock that perf uses.
6541 mono - Use ktime_get_mono_fast_ns() for time stamps.
6542 mono_raw - Use ktime_get_raw_fast_ns() for time
6544 boot - Use ktime_get_boot_fast_ns() for time stamps.
6548 trace_event=[event-list]
6550 to facilitate early boot debugging. The event-list is a
6551 comma-separated list of trace events to enable. See
6554 trace_instance=[instance-info]
6574 trace_options=[option-list]
6576 The option-list is a comma delimited list of options
6590 trace_trigger=[trigger-list]
6627 See Documentation/admin-guide/mm/transhuge.rst
6635 - "tpm"
6636 - "tee"
6637 - "caam"
6647 - "kernel"
6648 - the same value as trusted.source: "tpm" or "tee"
6649 - "default"
6651 the RNG's choice is left to each individual trust source.
6658 high-resolution timer mode on older hardware, and in
6694 on - Enable TSX on the system. Although there are
6697 several previous speculation-related CVEs, and
6701 off - Disable TSX on the system. (Note that this
6709 auto - Disable TSX if X86_BUG_TAA is present,
6714 See Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
6720 Similar to Micro-architectural Data Sampling (MDS)
6735 full - Enable TAA mitigation on vulnerable CPUs
6738 full,nosmt - Enable TAA mitigation and disable SMT on
6741 vulnerable to cross-thread TAA attacks.
6742 off - Unconditionally disable TAA mitigation
6744 On MDS-affected machines, tsx_async_abort=off can be
6756 Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
6759 TurboGraFX parallel port interface
6761 <port#>,<js1>,<js2>,<js3>,<js4>,<js5>,<js6>,<js7>
6762 See also Documentation/input/devices/joystick-parport.rst
6764 udbg-immortal [PPC] When debugging early kernel crashes that
6770 Set number of hash buckets for UDP/UDP-Lite connections
6772 uhci-hcd.ignore_oc=
6774 Some badly-designed motherboards generate lots of
6783 unwind_debug [X86-64]
6791 (default -1 = authorized (same as 1),
6793 if device connected to internal port)
6797 for newly-detected USB devices (default 2). This
6825 [USB] Specifies timeout for the initial 64-byte
6832 [USB] A list of quirk entries to augment the built-in
6835 VendorID:ProductID:Flags. The IDs are 4-digit hex
6837 will change the built-in quirk; setting it if it is
6842 a 255-byte read);
6846 Set-Interface requests);
6865 (bInterval-1).
6888 delay after resetting its port);
6903 usb-storage.delay_use=
6907 usb-storage.quirks=
6909 override the built-in unusual_devs list. List
6912 and Product ID values (4-digit hex numbers) and
6914 to a common usb-storage quirk flag as follows:
6956 medium is write-protected).
6965 1 - undefined instruction events
6966 2 - system calls
6967 4 - invalid data aborts
6968 8 - SIGSEGV faults
6969 16 - SIGBUS faults
6985 vdso32= [X86] Control the 32-bit vDSO
6986 vdso32=1: enable 32-bit VDSO
6987 vdso32=0 or vdso32=2: disable 32-bit VDSO
6997 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
6999 vector= [IA-64,SMP]
7031 vga= [BOOT,X86-32] Select a particular video mode
7033 Documentation/admin-guide/svga.rst.
7048 - Disable all of the above options
7069 vsyscall= [X86-64]
7072 code). Most statically-linked binaries and older
7096 see VGA-softcursor.txt. Default: 2 = underline.
7101 This is a 16-member array composed of values
7102 ranging from 0-255.
7107 This is a 16-member array composed of values
7108 ranging from 0-255.
7113 This is a 16-member array composed of values
7114 ranging from 0-255.
7119 Set system-wide default UTF-8 mode for all tty's.
7120 Default is 1, i.e. UTF-8 mode is enabled for all
7125 Format=<-1|0|1>
7126 Set system-wide default for whether a cursor
7127 is shown on new VTs. Default is -1,
7129 overridden by individual drivers. 0 will hide
7132 vt.italic= [VT] Default color for italic text; 0-15.
7135 vt.underline= [VT] Default color for underlined text; 0-15.
7139 see Documentation/watchdog/watchdog-parameters.rst
7140 or other driver-specific files in the
7154 Format: <cpu-list>
7168 Per-cpu work items which run for longer than this
7171 them from noticeably delaying other per-cpu work
7180 Per-cpu workqueues are generally preferred because
7182 locality; unfortunately, per-cpu workqueues tend to
7185 Enabling this makes the per-cpu workqueues which
7199 Documentation/core-api/workqueue.rst.
7212 forces round-robin CPU selection to flush out
7220 on - Enable writecombine, use WUC for ioremap_wc()
7221 off - Disable writecombine, use SUC for ioremap_wc()
7223 x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of
7227 xen_512gb_limit [KNL,X86-64,XEN]
7237 ide-disks -- unplug primary master IDE devices
7238 aux-ide-disks -- unplug non-primary-master IDE devices
7239 nics -- unplug network devices
7240 all -- unplug all emulated devices (NICs and IDE disks)
7241 unnecessary -- unplugging emulated devices is
7244 never -- do not unplug even if version check succeeds
7252 Select whether to always use non-faulting (safe) MSR
7277 xen_timer_slop= [X86-64,XEN]
7302 preferred over the 2-level event handling, as it is
7319 xive.store-eoi=off [PPC]
7325 xhci-hcd.quirks [USB,KNL]