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_CLOCKEVENTS 14 select GENERIC_CPU_DEVICES 15 select GENERIC_IRQ_PROBE 16 select GENERIC_IRQ_SHOW 17 select GENERIC_STRNCPY_FROM_USER 18 select GENERIC_STRNLEN_USER 19 select HAVE_ARCH_TRACEHOOK 20 select HAVE_ARCH_KGDB 21 select IRQ_DOMAIN 22 select MODULES_USE_ELF_RELA 23 select OF 24 select OF_EARLY_FLATTREE 25 select SOC_BUS 26 select SPARSE_IRQ 27 select USB_ARCH_HAS_HCD if USB_SUPPORT 28 select CPU_NO_EFFICIENT_FFS 29 select MMU_GATHER_NO_RANGE if MMU 30 select SET_FS 31 32config GENERIC_CSUM 33 def_bool y 34 35config GENERIC_HWEIGHT 36 def_bool y 37 38config GENERIC_CALIBRATE_DELAY 39 def_bool y 40 41config NO_IOPORT_MAP 42 def_bool y 43 44config FPU 45 def_bool n 46 47config TRACE_IRQFLAGS_SUPPORT 48 def_bool n 49 50menu "Kernel features" 51 52source "kernel/Kconfig.hz" 53 54config FORCE_MAX_ZONEORDER 55 int "Maximum zone order" 56 range 9 20 57 default "11" 58 help 59 The kernel memory allocator divides physically contiguous memory 60 blocks into "zones", where each zone is a power of two number of 61 pages. This option selects the largest power of two that the kernel 62 keeps in the memory allocator. If you need to allocate very large 63 blocks of physically contiguous memory, then you may need to 64 increase this value. 65 66 This config option is actually maximum order plus one. For example, 67 a value of 11 means that the largest free memory block is 2^10 pages. 68 69endmenu 70 71source "arch/nios2/platform/Kconfig.platform" 72 73menu "Processor type and features" 74 75config MMU 76 def_bool y 77 78config NR_CPUS 79 int 80 default "1" 81 82config NIOS2_ALIGNMENT_TRAP 83 bool "Catch alignment trap" 84 default y 85 help 86 Nios II CPUs cannot fetch/store data which is not bus aligned, 87 i.e., a 2 or 4 byte fetch must start at an address divisible by 88 2 or 4. Any non-aligned load/store instructions will be trapped and 89 emulated in software if you say Y here, which has a performance 90 impact. 91 92comment "Boot options" 93 94config CMDLINE_BOOL 95 bool "Default bootloader kernel arguments" 96 default y 97 98config CMDLINE 99 string "Default kernel command string" 100 default "" 101 depends on CMDLINE_BOOL 102 help 103 On some platforms, there is currently no way for the boot loader to 104 pass arguments to the kernel. For these platforms, you can supply 105 some command-line options at build time by entering them here. In 106 other cases you can specify kernel args so that you don't have 107 to set them up in board prom initialization routines. 108 109config CMDLINE_FORCE 110 bool "Force default kernel command string" 111 depends on CMDLINE_BOOL 112 help 113 Set this to have arguments from the default kernel command string 114 override those passed by the boot loader. 115 116config NIOS2_CMDLINE_IGNORE_DTB 117 bool "Ignore kernel command string from DTB" 118 depends on CMDLINE_BOOL 119 depends on !CMDLINE_FORCE 120 default y 121 help 122 Set this to ignore the bootargs property from the devicetree's 123 chosen node and fall back to CMDLINE if nothing is passed. 124 125config NIOS2_PASS_CMDLINE 126 bool "Passed kernel command line from u-boot" 127 help 128 Use bootargs env variable from u-boot for kernel command line. 129 will override "Default kernel command string". 130 Say N if you are unsure. 131 132config NIOS2_BOOT_LINK_OFFSET 133 hex "Link address offset for booting" 134 default "0x00500000" 135 help 136 This option allows you to set the link address offset of the zImage. 137 This can be useful if you are on a board which has a small amount of 138 memory. 139 140endmenu 141 142menu "Advanced setup" 143 144config ADVANCED_OPTIONS 145 bool "Prompt for advanced kernel configuration options" 146 147comment "Default settings for advanced configuration options are used" 148 depends on !ADVANCED_OPTIONS 149 150config NIOS2_KERNEL_MMU_REGION_BASE_BOOL 151 bool "Set custom kernel MMU region base address" 152 depends on ADVANCED_OPTIONS 153 help 154 This option allows you to set the virtual address of the kernel MMU region. 155 156 Say N here unless you know what you are doing. 157 158config NIOS2_KERNEL_MMU_REGION_BASE 159 hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL 160 default "0x80000000" 161 help 162 This option allows you to set the virtual base address of the kernel MMU region. 163 164config NIOS2_KERNEL_REGION_BASE_BOOL 165 bool "Set custom kernel region base address" 166 depends on ADVANCED_OPTIONS 167 help 168 This option allows you to set the virtual address of the kernel region. 169 170 Say N here unless you know what you are doing. 171 172config NIOS2_KERNEL_REGION_BASE 173 hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL 174 default "0xc0000000" 175 176config NIOS2_IO_REGION_BASE_BOOL 177 bool "Set custom I/O region base address" 178 depends on ADVANCED_OPTIONS 179 help 180 This option allows you to set the virtual address of the I/O region. 181 182 Say N here unless you know what you are doing. 183 184config NIOS2_IO_REGION_BASE 185 hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL 186 default "0xe0000000" 187 188endmenu 189