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