1# SPDX-License-Identifier: GPL-2.0-only 2config MICROBLAZE 3 def_bool y 4 select ARCH_32BIT_OFF_T 5 select ARCH_NO_SWAP 6 select ARCH_HAS_BINFMT_FLAT if !MMU 7 select ARCH_HAS_DMA_PREP_COHERENT 8 select ARCH_HAS_GCOV_PROFILE_ALL 9 select ARCH_HAS_SYNC_DMA_FOR_CPU 10 select ARCH_HAS_SYNC_DMA_FOR_DEVICE 11 select ARCH_HAS_UNCACHED_SEGMENT if !MMU 12 select ARCH_MIGHT_HAVE_PC_PARPORT 13 select ARCH_WANT_IPC_PARSE_VERSION 14 select BUILDTIME_TABLE_SORT 15 select TIMER_OF 16 select CLONE_BACKWARDS3 17 select COMMON_CLK 18 select DMA_DIRECT_REMAP if MMU 19 select GENERIC_ATOMIC64 20 select GENERIC_CLOCKEVENTS 21 select GENERIC_CPU_DEVICES 22 select GENERIC_IDLE_POLL_SETUP 23 select GENERIC_IRQ_PROBE 24 select GENERIC_IRQ_SHOW 25 select GENERIC_PCI_IOMAP 26 select GENERIC_SCHED_CLOCK 27 select HAVE_ARCH_HASH 28 select HAVE_ARCH_KGDB 29 select HAVE_DEBUG_KMEMLEAK 30 select HAVE_DMA_CONTIGUOUS 31 select HAVE_DYNAMIC_FTRACE 32 select HAVE_FTRACE_MCOUNT_RECORD 33 select HAVE_FUNCTION_GRAPH_TRACER 34 select HAVE_FUNCTION_TRACER 35 select HAVE_MEMBLOCK_NODE_MAP 36 select HAVE_OPROFILE 37 select HAVE_PCI 38 select IRQ_DOMAIN 39 select XILINX_INTC 40 select MODULES_USE_ELF_RELA 41 select OF 42 select OF_EARLY_FLATTREE 43 select PCI_DOMAINS_GENERIC if PCI 44 select PCI_SYSCALL if PCI 45 select TRACING_SUPPORT 46 select VIRT_TO_BUS 47 select CPU_NO_EFFICIENT_FFS 48 select MMU_GATHER_NO_RANGE if MMU 49 select SPARSE_IRQ 50 51# Endianness selection 52choice 53 prompt "Endianness selection" 54 default CPU_LITTLE_ENDIAN 55 help 56 microblaze architectures can be configured for either little or 57 big endian formats. Be sure to select the appropriate mode. 58 59config CPU_BIG_ENDIAN 60 bool "Big endian" 61 62config CPU_LITTLE_ENDIAN 63 bool "Little endian" 64 65endchoice 66 67config ZONE_DMA 68 def_bool y 69 70config ARCH_HAS_ILOG2_U32 71 def_bool n 72 73config ARCH_HAS_ILOG2_U64 74 def_bool n 75 76config GENERIC_HWEIGHT 77 def_bool y 78 79config GENERIC_CALIBRATE_DELAY 80 def_bool y 81 82config GENERIC_CSUM 83 def_bool y 84 85config STACKTRACE_SUPPORT 86 def_bool y 87 88config LOCKDEP_SUPPORT 89 def_bool y 90 91source "arch/microblaze/Kconfig.platform" 92 93menu "Processor type and features" 94 95source "kernel/Kconfig.hz" 96 97config MMU 98 bool "MMU support" 99 default n 100 101comment "Boot options" 102 103config CMDLINE_BOOL 104 bool "Default bootloader kernel arguments" 105 106config CMDLINE 107 string "Default kernel command string" 108 depends on CMDLINE_BOOL 109 default "console=ttyUL0,115200" 110 help 111 On some architectures there is currently no way for the boot loader 112 to pass arguments to the kernel. For these architectures, you should 113 supply some command-line options at build time by entering them 114 here. 115 116config CMDLINE_FORCE 117 bool "Force default kernel command string" 118 depends on CMDLINE_BOOL 119 default n 120 help 121 Set this to have arguments from the default kernel command string 122 override those passed by the boot loader. 123 124config SECCOMP 125 bool "Enable seccomp to safely compute untrusted bytecode" 126 depends on PROC_FS 127 default y 128 help 129 This kernel feature is useful for number crunching applications 130 that may need to compute untrusted bytecode during their 131 execution. By using pipes or other transports made available to 132 the process as file descriptors supporting the read/write 133 syscalls, it's possible to isolate those applications in 134 their own address space using seccomp. Once seccomp is 135 enabled via /proc/<pid>/seccomp, it cannot be disabled 136 and the task is only allowed to execute a few safe syscalls 137 defined by each seccomp mode. 138 139 If unsure, say Y. Only embedded should say N here. 140 141endmenu 142 143menu "Kernel features" 144 145config NR_CPUS 146 int 147 default "1" 148 149config ADVANCED_OPTIONS 150 bool "Prompt for advanced kernel configuration options" 151 help 152 This option will enable prompting for a variety of advanced kernel 153 configuration options. These options can cause the kernel to not 154 work if they are set incorrectly, but can be used to optimize certain 155 aspects of kernel memory management. 156 157 Unless you know what you are doing, say N here. 158 159comment "Default settings for advanced configuration options are used" 160 depends on !ADVANCED_OPTIONS 161 162config XILINX_UNCACHED_SHADOW 163 bool "Are you using uncached shadow for RAM ?" 164 depends on ADVANCED_OPTIONS && !MMU 165 default n 166 help 167 This is needed to be able to allocate uncachable memory regions. 168 The feature requires the design to define the RAM memory controller 169 window to be twice as large as the actual physical memory. 170 171config HIGHMEM 172 bool "High memory support" 173 depends on MMU 174 help 175 The address space of Microblaze processors is only 4 Gigabytes large 176 and it has to accommodate user address space, kernel address 177 space as well as some memory mapped IO. That means that, if you 178 have a large amount of physical memory and/or IO, not all of the 179 memory can be "permanently mapped" by the kernel. The physical 180 memory that is not permanently mapped is called "high memory". 181 182 If unsure, say n. 183 184config LOWMEM_SIZE_BOOL 185 bool "Set maximum low memory" 186 depends on ADVANCED_OPTIONS && MMU 187 help 188 This option allows you to set the maximum amount of memory which 189 will be used as "low memory", that is, memory which the kernel can 190 access directly, without having to set up a kernel virtual mapping. 191 This can be useful in optimizing the layout of kernel virtual 192 memory. 193 194 Say N here unless you know what you are doing. 195 196config LOWMEM_SIZE 197 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 198 default "0x30000000" 199 200config MANUAL_RESET_VECTOR 201 hex "Microblaze reset vector address setup" 202 default "0x0" 203 help 204 Set this option to have the kernel override the CPU Reset vector. 205 If zero, no change will be made to the MicroBlaze reset vector at 206 address 0x0. 207 If non-zero, a jump instruction to this address, will be written 208 to the reset vector at address 0x0. 209 If you are unsure, set it to default value 0x0. 210 211config KERNEL_START_BOOL 212 bool "Set custom kernel base address" 213 depends on ADVANCED_OPTIONS 214 help 215 This option allows you to set the kernel virtual address at which 216 the kernel will map low memory (the kernel image will be linked at 217 this address). This can be useful in optimizing the virtual memory 218 layout of the system. 219 220 Say N here unless you know what you are doing. 221 222config KERNEL_START 223 hex "Virtual address of kernel base" if KERNEL_START_BOOL 224 default "0xc0000000" if MMU 225 default KERNEL_BASE_ADDR if !MMU 226 227config TASK_SIZE_BOOL 228 bool "Set custom user task size" 229 depends on ADVANCED_OPTIONS && MMU 230 help 231 This option allows you to set the amount of virtual address space 232 allocated to user tasks. This can be useful in optimizing the 233 virtual memory layout of the system. 234 235 Say N here unless you know what you are doing. 236 237config TASK_SIZE 238 hex "Size of user task space" if TASK_SIZE_BOOL 239 default "0x80000000" 240 241choice 242 prompt "Page size" 243 default MICROBLAZE_4K_PAGES 244 depends on ADVANCED_OPTIONS && !MMU 245 help 246 Select the kernel logical page size. Increasing the page size 247 will reduce software overhead at each page boundary, allow 248 hardware prefetch mechanisms to be more effective, and allow 249 larger dma transfers increasing IO efficiency and reducing 250 overhead. However the utilization of memory will increase. 251 For example, each cached file will using a multiple of the 252 page size to hold its contents and the difference between the 253 end of file and the end of page is wasted. 254 255 If unsure, choose 4K_PAGES. 256 257config MICROBLAZE_4K_PAGES 258 bool "4k page size" 259 260config MICROBLAZE_16K_PAGES 261 bool "16k page size" 262 263config MICROBLAZE_64K_PAGES 264 bool "64k page size" 265 266endchoice 267 268endmenu 269 270menu "Bus Options" 271 272config PCI_XILINX 273 bool "Xilinx PCI host bridge support" 274 depends on PCI 275 276endmenu 277