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