1# SPDX-License-Identifier: GPL-2.0 2config NIOS2 3 def_bool y 4 select ARCH_32BIT_OFF_T 5 select ARCH_HAS_SYNC_DMA_FOR_CPU 6 select ARCH_HAS_SYNC_DMA_FOR_DEVICE 7 select ARCH_NO_SWAP 8 select TIMER_OF 9 select GENERIC_ATOMIC64 10 select GENERIC_CLOCKEVENTS 11 select GENERIC_CPU_DEVICES 12 select GENERIC_IRQ_PROBE 13 select GENERIC_IRQ_SHOW 14 select GENERIC_STRNCPY_FROM_USER 15 select GENERIC_STRNLEN_USER 16 select HAVE_ARCH_TRACEHOOK 17 select HAVE_ARCH_KGDB 18 select IRQ_DOMAIN 19 select MODULES_USE_ELF_RELA 20 select OF 21 select OF_EARLY_FLATTREE 22 select SOC_BUS 23 select SPARSE_IRQ 24 select USB_ARCH_HAS_HCD if USB_SUPPORT 25 select CPU_NO_EFFICIENT_FFS 26 select MMU_GATHER_NO_RANGE if MMU 27 28config GENERIC_CSUM 29 def_bool y 30 31config GENERIC_HWEIGHT 32 def_bool y 33 34config GENERIC_CALIBRATE_DELAY 35 def_bool y 36 37config NO_IOPORT_MAP 38 def_bool y 39 40config FPU 41 def_bool n 42 43config TRACE_IRQFLAGS_SUPPORT 44 def_bool n 45 46menu "Kernel features" 47 48source "kernel/Kconfig.hz" 49 50config FORCE_MAX_ZONEORDER 51 int "Maximum zone order" 52 range 9 20 53 default "11" 54 help 55 The kernel memory allocator divides physically contiguous memory 56 blocks into "zones", where each zone is a power of two number of 57 pages. This option selects the largest power of two that the kernel 58 keeps in the memory allocator. If you need to allocate very large 59 blocks of physically contiguous memory, then you may need to 60 increase this value. 61 62 This config option is actually maximum order plus one. For example, 63 a value of 11 means that the largest free memory block is 2^10 pages. 64 65endmenu 66 67source "arch/nios2/platform/Kconfig.platform" 68 69menu "Processor type and features" 70 71config MMU 72 def_bool y 73 74config NR_CPUS 75 int 76 default "1" 77 78config NIOS2_ALIGNMENT_TRAP 79 bool "Catch alignment trap" 80 default y 81 help 82 Nios II CPUs cannot fetch/store data which is not bus aligned, 83 i.e., a 2 or 4 byte fetch must start at an address divisible by 84 2 or 4. Any non-aligned load/store instructions will be trapped and 85 emulated in software if you say Y here, which has a performance 86 impact. 87 88comment "Boot options" 89 90config CMDLINE_BOOL 91 bool "Default bootloader kernel arguments" 92 default y 93 94config CMDLINE 95 string "Default kernel command string" 96 default "" 97 depends on CMDLINE_BOOL 98 help 99 On some platforms, there is currently no way for the boot loader to 100 pass arguments to the kernel. For these platforms, you can supply 101 some command-line options at build time by entering them here. In 102 other cases you can specify kernel args so that you don't have 103 to set them up in board prom initialization routines. 104 105config CMDLINE_FORCE 106 bool "Force default kernel command string" 107 depends on CMDLINE_BOOL 108 help 109 Set this to have arguments from the default kernel command string 110 override those passed by the boot loader. 111 112config NIOS2_CMDLINE_IGNORE_DTB 113 bool "Ignore kernel command string from DTB" 114 depends on CMDLINE_BOOL 115 depends on !CMDLINE_FORCE 116 default y 117 help 118 Set this to ignore the bootargs property from the devicetree's 119 chosen node and fall back to CMDLINE if nothing is passed. 120 121config NIOS2_PASS_CMDLINE 122 bool "Passed kernel command line from u-boot" 123 help 124 Use bootargs env variable from u-boot for kernel command line. 125 will override "Default kernel command string". 126 Say N if you are unsure. 127 128config NIOS2_BOOT_LINK_OFFSET 129 hex "Link address offset for booting" 130 default "0x00500000" 131 help 132 This option allows you to set the link address offset of the zImage. 133 This can be useful if you are on a board which has a small amount of 134 memory. 135 136endmenu 137 138menu "Advanced setup" 139 140config ADVANCED_OPTIONS 141 bool "Prompt for advanced kernel configuration options" 142 143comment "Default settings for advanced configuration options are used" 144 depends on !ADVANCED_OPTIONS 145 146config NIOS2_KERNEL_MMU_REGION_BASE_BOOL 147 bool "Set custom kernel MMU region base address" 148 depends on ADVANCED_OPTIONS 149 help 150 This option allows you to set the virtual address of the kernel MMU region. 151 152 Say N here unless you know what you are doing. 153 154config NIOS2_KERNEL_MMU_REGION_BASE 155 hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL 156 default "0x80000000" 157 help 158 This option allows you to set the virtual base address of the kernel MMU region. 159 160config NIOS2_KERNEL_REGION_BASE_BOOL 161 bool "Set custom kernel region base address" 162 depends on ADVANCED_OPTIONS 163 help 164 This option allows you to set the virtual address of the kernel region. 165 166 Say N here unless you know what you are doing. 167 168config NIOS2_KERNEL_REGION_BASE 169 hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL 170 default "0xc0000000" 171 172config NIOS2_IO_REGION_BASE_BOOL 173 bool "Set custom I/O region base address" 174 depends on ADVANCED_OPTIONS 175 help 176 This option allows you to set the virtual address of the I/O region. 177 178 Say N here unless you know what you are doing. 179 180config NIOS2_IO_REGION_BASE 181 hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL 182 default "0xe0000000" 183 184endmenu 185