2 # Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4 # This program is free software; you can redistribute it and/or modify
5 # it under the terms of the GNU General Public License version 2 as
6 # published by the Free Software Foundation.
11 select ARCH_NO_VIRT_TO_BUS
12 select CLONE_BACKWARDS
13 # ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev
14 select DEVTMPFS if !INITRAMFS_SOURCE=""
15 select GENERIC_ATOMIC64
16 select GENERIC_CLOCKEVENTS
17 select GENERIC_FIND_FIRST_BIT
18 # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
19 select GENERIC_IRQ_SHOW
20 select GENERIC_KERNEL_EXECVE
21 select GENERIC_KERNEL_THREAD
22 select GENERIC_PENDING_IRQ if SMP
23 select GENERIC_SMP_IDLE_THREAD
24 select HAVE_GENERIC_HARDIRQS
25 select MODULES_USE_ELF_RELA
27 config SCHED_OMIT_FRAME_POINTER
33 config RWSEM_GENERIC_SPINLOCK
36 config ARCH_FLATMEM_ENABLE
45 config GENERIC_CALIBRATE_DELAY
48 config GENERIC_HWEIGHT
54 config HAVE_LATENCYTOP_SUPPORT
61 source "kernel/Kconfig.freezer"
63 menu "ARC Architecture Configuration"
67 default ARC_PLAT_FPGA_LEGACY
69 config ARC_PLAT_FPGA_LEGACY
70 bool "\"Legacy\" ARC FPGA dev platform"
72 Support for ARC development platforms, provided by Synopsys.
73 These are based on FPGA or ISS. e.g.
78 #New platform adds here
81 menu "ARC CPU Configuration"
90 Support for ARC750 core
94 select ARC_CPU_REL_4_10
96 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
97 This core has a bunch of cool new features:
98 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
99 Shared Address Spaces (for sharing TLB entires in MMU)
100 -Caches: New Prog Model, Region Flush
101 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
105 config CPU_BIG_ENDIAN
106 bool "Enable Big Endian Mode"
109 Build kernel for Big Endian Mode of ARC CPU
112 bool "Enable Cache Support"
117 config ARC_CACHE_LINE_SHIFT
118 int "Cache Line Length (as power of 2)"
122 Starting with ARC700 4.9, Cache line length is configurable,
123 This option specifies "N", with Line-len = 2 power N
124 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
125 Linux only supports same line lengths for I and D caches.
127 config ARC_HAS_ICACHE
128 bool "Use Instruction Cache"
131 config ARC_HAS_DCACHE
132 bool "Use Data Cache"
135 config ARC_CACHE_PAGES
136 bool "Per Page Cache Control"
138 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
140 This can be used to over-ride the global I/D Cache Enable on a
141 per-page basis (but only for pages accessed via MMU such as
142 Kernel Virtual address or User Virtual Address)
143 TLB entries have a per-page Cache Enable Bit.
144 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
145 Global DISABLE + Per Page ENABLE won't work
149 config ARC_HAS_HW_MPY
150 bool "Use Hardware Multiplier (Normal or Faster XMAC)"
153 Influences how gcc generates code for MPY operations.
154 If enabled, MPYxx insns are generated, provided by Standard/XMAC
155 Multipler. Otherwise software multipy lib is used
158 prompt "ARC700 MMU Version"
159 default ARC_MMU_V3 if ARC_CPU_770
160 default ARC_MMU_V2 if ARC_CPU_750D
170 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
171 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
175 depends on ARC_CPU_770
177 Introduced with ARC700 4.10: New Features
178 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
179 Shared Address Spaces (SASID)
185 prompt "MMU Page Size"
186 default ARC_PAGE_SIZE_8K
188 config ARC_PAGE_SIZE_8K
191 Choose between 8k vs 16k
193 config ARC_PAGE_SIZE_16K
195 depends on ARC_MMU_V3
197 config ARC_PAGE_SIZE_4K
199 depends on ARC_MMU_V3
203 config ARC_FPU_SAVE_RESTORE
204 bool "Enable FPU state persistence across context switch"
207 Double Precision Floating Point unit had dedictaed regs which
208 need to be saved/restored across context-switch.
209 Note that ARC FPU is overly simplistic, unlike say x86, which has
210 hardware pieces to allow software to conditionally save/restore,
211 based on actual usage of FPU by a task. Thus our implemn does
212 this for all tasks in system.
214 menuconfig ARC_CPU_REL_4_10
215 bool "Enable support for Rel 4.10 features"
218 -ARC770 (and dependent features) enabled
219 -ARC750 also shares some of the new features with 770
222 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
224 depends on ARC_CPU_770
225 # if SMP, enable LLSC ONLY if ARC implementation has coherent atomics
226 depends on !SMP || ARC_HAS_COH_LLSC
229 bool "Insn: SWAPE (endian-swap)"
231 depends on ARC_CPU_REL_4_10
234 bool "Insn: RTSC (64-bit r/o cycle counter)"
236 depends on ARC_CPU_REL_4_10
238 endmenu # "ARC CPU Configuration"
240 menu "Platform Board Configuration"
242 source "arch/arc/plat-arcfpga/Kconfig"
244 #New platform adds here
247 int "Clk speed in Hz"
250 config LINUX_LINK_BASE
251 hex "Linux Link Address"
254 ARC700 divides the 32 bit phy address space into two equal halves
255 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
256 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
257 Typically Linux kernel is linked at the start of untransalted addr,
258 hence the default value of 0x8zs.
259 However some customers have peripherals mapped at this addr, so
260 Linux needs to be scooted a bit.
261 If you don't know what the above means, leave this setting alone.
263 config ARC_PLAT_SDRAM_SIZE
267 Implies the amount of SDRAM/DRAM Linux is going to claim/own.
268 The actual memory itself could be larger than this number. But for
269 all software purposes, this is the amt of memory.
271 endmenu # "Platform Board Configuration"
273 config ARC_STACK_NONEXEC
274 bool "Make stack non-executable"
277 To disable the execute permissions of stack/heap of processes
278 which are enabled by default.
281 int "Timer Frequency"
288 config ARC_DBG_TLB_PARANOIA
289 bool "Paranoia Checks in Low Level TLB Handlers"
293 config ARC_DBG_TLB_MISS_COUNT
294 bool "Profile TLB Misses"
299 Counts number of I and D TLB Misses and exports them via Debugfs
300 The counters can be cleared via Debugfs as well
303 string "Kernel command line to built-in"
304 default "print-fatal-signals=1"
306 The default command line which will be appended to the optional
307 u-boot provided command line (see below)
310 bool "Support U-boot kernel command line passing"
313 If you are using U-boot (www.denx.de) and wish to pass the kernel
314 command line from the U-boot environment to the Linux kernel then
315 switch this option on.
316 ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
317 to it. kernel startup code will copy the string into cmdline buffer
318 and also append CONFIG_CMDLINE.
320 source "kernel/Kconfig.preempt"
322 endmenu # "ARC Architecture Configuration"
326 source "drivers/Kconfig"
328 source "arch/arc/Kconfig.debug"
329 source "security/Kconfig"
330 source "crypto/Kconfig"