1# SPDX-License-Identifier: GPL-2.0 2config NIOS2 3 def_bool y 4 select ARCH_HAS_SYNC_DMA_FOR_CPU 5 select ARCH_HAS_SYNC_DMA_FOR_DEVICE 6 select ARCH_NO_SWAP 7 select TIMER_OF 8 select GENERIC_ATOMIC64 9 select GENERIC_CLOCKEVENTS 10 select GENERIC_CPU_DEVICES 11 select GENERIC_IRQ_PROBE 12 select GENERIC_IRQ_SHOW 13 select GENERIC_STRNCPY_FROM_USER 14 select GENERIC_STRNLEN_USER 15 select HAVE_ARCH_TRACEHOOK 16 select HAVE_ARCH_KGDB 17 select IRQ_DOMAIN 18 select MODULES_USE_ELF_RELA 19 select OF 20 select OF_EARLY_FLATTREE 21 select SOC_BUS 22 select SPARSE_IRQ 23 select USB_ARCH_HAS_HCD if USB_SUPPORT 24 select CPU_NO_EFFICIENT_FFS 25 select ARCH_DISCARD_MEMBLOCK 26 27config GENERIC_CSUM 28 def_bool y 29 30config GENERIC_HWEIGHT 31 def_bool y 32 33config GENERIC_CALIBRATE_DELAY 34 def_bool y 35 36config NO_IOPORT_MAP 37 def_bool y 38 39config FPU 40 def_bool n 41 42config RWSEM_GENERIC_SPINLOCK 43 def_bool y 44 45config TRACE_IRQFLAGS_SUPPORT 46 def_bool n 47 48menu "Kernel features" 49 50source "kernel/Kconfig.hz" 51 52config FORCE_MAX_ZONEORDER 53 int "Maximum zone order" 54 range 9 20 55 default "11" 56 help 57 The kernel memory allocator divides physically contiguous memory 58 blocks into "zones", where each zone is a power of two number of 59 pages. This option selects the largest power of two that the kernel 60 keeps in the memory allocator. If you need to allocate very large 61 blocks of physically contiguous memory, then you may need to 62 increase this value. 63 64 This config option is actually maximum order plus one. For example, 65 a value of 11 means that the largest free memory block is 2^10 pages. 66 67endmenu 68 69source "arch/nios2/platform/Kconfig.platform" 70 71menu "Processor type and features" 72 73config MMU 74 def_bool y 75 76config NR_CPUS 77 int 78 default "1" 79 80config NIOS2_ALIGNMENT_TRAP 81 bool "Catch alignment trap" 82 default y 83 help 84 Nios II CPUs cannot fetch/store data which is not bus aligned, 85 i.e., a 2 or 4 byte fetch must start at an address divisible by 86 2 or 4. Any non-aligned load/store instructions will be trapped and 87 emulated in software if you say Y here, which has a performance 88 impact. 89 90comment "Boot options" 91 92config CMDLINE_BOOL 93 bool "Default bootloader kernel arguments" 94 default y 95 96config CMDLINE 97 string "Default kernel command string" 98 default "" 99 depends on CMDLINE_BOOL 100 help 101 On some platforms, there is currently no way for the boot loader to 102 pass arguments to the kernel. For these platforms, you can supply 103 some command-line options at build time by entering them here. In 104 other cases you can specify kernel args so that you don't have 105 to set them up in board prom initialization routines. 106 107config CMDLINE_FORCE 108 bool "Force default kernel command string" 109 depends on CMDLINE_BOOL 110 help 111 Set this to have arguments from the default kernel command string 112 override those passed by the boot loader. 113 114config NIOS2_CMDLINE_IGNORE_DTB 115 bool "Ignore kernel command string from DTB" 116 depends on CMDLINE_BOOL 117 depends on !CMDLINE_FORCE 118 default y 119 help 120 Set this to ignore the bootargs property from the devicetree's 121 chosen node and fall back to CMDLINE if nothing is passed. 122 123config NIOS2_PASS_CMDLINE 124 bool "Passed kernel command line from u-boot" 125 default n 126 help 127 Use bootargs env variable from u-boot for kernel command line. 128 will override "Default kernel command string". 129 Say N if you are unsure. 130 131config NIOS2_BOOT_LINK_OFFSET 132 hex "Link address offset for booting" 133 default "0x00500000" 134 help 135 This option allows you to set the link address offset of the zImage. 136 This can be useful if you are on a board which has a small amount of 137 memory. 138 139endmenu 140 141menu "Advanced setup" 142 143config ADVANCED_OPTIONS 144 bool "Prompt for advanced kernel configuration options" 145 146comment "Default settings for advanced configuration options are used" 147 depends on !ADVANCED_OPTIONS 148 149config NIOS2_KERNEL_MMU_REGION_BASE_BOOL 150 bool "Set custom kernel MMU region base address" 151 depends on ADVANCED_OPTIONS 152 help 153 This option allows you to set the virtual address of the kernel MMU region. 154 155 Say N here unless you know what you are doing. 156 157config NIOS2_KERNEL_MMU_REGION_BASE 158 hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL 159 default "0x80000000" 160 help 161 This option allows you to set the virtual base address of the kernel MMU region. 162 163config NIOS2_KERNEL_REGION_BASE_BOOL 164 bool "Set custom kernel region base address" 165 depends on ADVANCED_OPTIONS 166 help 167 This option allows you to set the virtual address of the kernel region. 168 169 Say N here unless you know what you are doing. 170 171config NIOS2_KERNEL_REGION_BASE 172 hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL 173 default "0xc0000000" 174 175config NIOS2_IO_REGION_BASE_BOOL 176 bool "Set custom I/O region base address" 177 depends on ADVANCED_OPTIONS 178 help 179 This option allows you to set the virtual address of the I/O region. 180 181 Say N here unless you know what you are doing. 182 183config NIOS2_IO_REGION_BASE 184 hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL 185 default "0xe0000000" 186 187endmenu 188