1# SPDX-License-Identifier: GPL-2.0 2config NIOS2 3 def_bool y 4 select ARCH_32BIT_OFF_T 5 select ARCH_HAS_DMA_PREP_COHERENT 6 select ARCH_HAS_SYNC_DMA_FOR_CPU 7 select ARCH_HAS_SYNC_DMA_FOR_DEVICE 8 select ARCH_HAS_DMA_SET_UNCACHED 9 select ARCH_NO_SWAP 10 select COMMON_CLK 11 select TIMER_OF 12 select GENERIC_ATOMIC64 13 select GENERIC_CPU_DEVICES 14 select GENERIC_IRQ_PROBE 15 select GENERIC_IRQ_SHOW 16 select GENERIC_STRNCPY_FROM_USER 17 select GENERIC_STRNLEN_USER 18 select HAVE_ARCH_TRACEHOOK 19 select HAVE_ARCH_KGDB 20 select IRQ_DOMAIN 21 select MODULES_USE_ELF_RELA 22 select OF 23 select OF_EARLY_FLATTREE 24 select SOC_BUS 25 select SPARSE_IRQ 26 select USB_ARCH_HAS_HCD if USB_SUPPORT 27 select CPU_NO_EFFICIENT_FFS 28 select MMU_GATHER_NO_RANGE if MMU 29 select SET_FS 30 31config GENERIC_CSUM 32 def_bool y 33 34config GENERIC_HWEIGHT 35 def_bool y 36 37config GENERIC_CALIBRATE_DELAY 38 def_bool y 39 40config NO_IOPORT_MAP 41 def_bool y 42 43config FPU 44 def_bool n 45 46config TRACE_IRQFLAGS_SUPPORT 47 def_bool n 48 49menu "Kernel features" 50 51source "kernel/Kconfig.hz" 52 53config FORCE_MAX_ZONEORDER 54 int "Maximum zone order" 55 range 9 20 56 default "11" 57 help 58 The kernel memory allocator divides physically contiguous memory 59 blocks into "zones", where each zone is a power of two number of 60 pages. This option selects the largest power of two that the kernel 61 keeps in the memory allocator. If you need to allocate very large 62 blocks of physically contiguous memory, then you may need to 63 increase this value. 64 65 This config option is actually maximum order plus one. For example, 66 a value of 11 means that the largest free memory block is 2^10 pages. 67 68endmenu 69 70source "arch/nios2/platform/Kconfig.platform" 71 72menu "Processor type and features" 73 74config MMU 75 def_bool y 76 77config NR_CPUS 78 int 79 default "1" 80 81config NIOS2_ALIGNMENT_TRAP 82 bool "Catch alignment trap" 83 default y 84 help 85 Nios II CPUs cannot fetch/store data which is not bus aligned, 86 i.e., a 2 or 4 byte fetch must start at an address divisible by 87 2 or 4. Any non-aligned load/store instructions will be trapped and 88 emulated in software if you say Y here, which has a performance 89 impact. 90 91comment "Boot options" 92 93config CMDLINE_BOOL 94 bool "Default bootloader kernel arguments" 95 default y 96 97config CMDLINE 98 string "Default kernel command string" 99 default "" 100 depends on CMDLINE_BOOL 101 help 102 On some platforms, there is currently no way for the boot loader to 103 pass arguments to the kernel. For these platforms, you can supply 104 some command-line options at build time by entering them here. In 105 other cases you can specify kernel args so that you don't have 106 to set them up in board prom initialization routines. 107 108config CMDLINE_FORCE 109 bool "Force default kernel command string" 110 depends on CMDLINE_BOOL 111 help 112 Set this to have arguments from the default kernel command string 113 override those passed by the boot loader. 114 115config NIOS2_CMDLINE_IGNORE_DTB 116 bool "Ignore kernel command string from DTB" 117 depends on CMDLINE_BOOL 118 depends on !CMDLINE_FORCE 119 default y 120 help 121 Set this to ignore the bootargs property from the devicetree's 122 chosen node and fall back to CMDLINE if nothing is passed. 123 124config NIOS2_PASS_CMDLINE 125 bool "Passed kernel command line from u-boot" 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