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