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 CLONE_BACKWARDS
12 # ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev
13 select DEVTMPFS if !INITRAMFS_SOURCE=""
14 select GENERIC_ATOMIC64
15 select GENERIC_CLOCKEVENTS
16 select GENERIC_FIND_FIRST_BIT
17 # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
18 select GENERIC_IRQ_SHOW
19 select GENERIC_PENDING_IRQ if SMP
20 select GENERIC_SMP_IDLE_THREAD
22 select HAVE_ARCH_TRACEHOOK
23 select HAVE_GENERIC_HARDIRQS
24 select HAVE_IOREMAP_PROT
26 select HAVE_KRETPROBES
28 select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
30 select HAVE_PERF_EVENTS
32 select MODULES_USE_ELF_RELA
35 select OF_EARLY_FLATTREE
36 select PERF_USE_VMALLOC
37 select HAVE_DEBUG_STACKOVERFLOW
39 config SCHED_OMIT_FRAME_POINTER
45 config RWSEM_GENERIC_SPINLOCK
48 config ARCH_FLATMEM_ENABLE
57 config GENERIC_CALIBRATE_DELAY
60 config GENERIC_HWEIGHT
63 config STACKTRACE_SUPPORT
67 config HAVE_LATENCYTOP_SUPPORT
74 source "kernel/Kconfig.freezer"
76 menu "ARC Architecture Configuration"
78 menu "ARC Platform/SoC/Board"
80 source "arch/arc/plat-arcfpga/Kconfig"
81 source "arch/arc/plat-tb10x/Kconfig"
82 #New platform adds here
86 menu "ARC CPU Configuration"
95 Support for ARC750 core
99 select ARC_CPU_REL_4_10
101 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
102 This core has a bunch of cool new features:
103 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
104 Shared Address Spaces (for sharing TLB entires in MMU)
105 -Caches: New Prog Model, Region Flush
106 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
110 config CPU_BIG_ENDIAN
111 bool "Enable Big Endian Mode"
114 Build kernel for Big Endian Mode of ARC CPU
116 # If a platform can't work with 0x8000_0000 based dma_addr_t
117 config ARC_PLAT_NEEDS_CPU_TO_DMA
121 bool "Symmetric Multi-Processing (Incomplete)"
123 select USE_GENERIC_SMP_HELPERS
125 This enables support for systems with more than one CPU. If you have
126 a system with only one CPU, like most personal computers, say N. If
127 you have a system with more than one CPU, say Y.
131 config ARC_HAS_COH_CACHES
134 config ARC_HAS_COH_RTSC
137 config ARC_HAS_REENTRANT_IRQ_LV2
143 int "Maximum number of CPUs (2-32)"
149 bool "Enable Cache Support"
151 # if SMP, cache enabled ONLY if ARC implementation has cache coherency
152 depends on !SMP || ARC_HAS_COH_CACHES
156 config ARC_CACHE_LINE_SHIFT
157 int "Cache Line Length (as power of 2)"
161 Starting with ARC700 4.9, Cache line length is configurable,
162 This option specifies "N", with Line-len = 2 power N
163 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
164 Linux only supports same line lengths for I and D caches.
166 config ARC_HAS_ICACHE
167 bool "Use Instruction Cache"
170 config ARC_HAS_DCACHE
171 bool "Use Data Cache"
174 config ARC_CACHE_PAGES
175 bool "Per Page Cache Control"
177 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
179 This can be used to over-ride the global I/D Cache Enable on a
180 per-page basis (but only for pages accessed via MMU such as
181 Kernel Virtual address or User Virtual Address)
182 TLB entries have a per-page Cache Enable Bit.
183 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
184 Global DISABLE + Per Page ENABLE won't work
186 config ARC_CACHE_VIPT_ALIASING
187 bool "Support VIPT Aliasing D$"
188 depends on ARC_HAS_DCACHE
196 Single Cycle RAMS to store Fast Path Code
200 int "ICCM Size in KB"
202 depends on ARC_HAS_ICCM
207 Single Cycle RAMS to store Fast Path Data
211 int "DCCM Size in KB"
213 depends on ARC_HAS_DCCM
216 hex "DCCM map address"
218 depends on ARC_HAS_DCCM
220 config ARC_HAS_HW_MPY
221 bool "Use Hardware Multiplier (Normal or Faster XMAC)"
224 Influences how gcc generates code for MPY operations.
225 If enabled, MPYxx insns are generated, provided by Standard/XMAC
226 Multipler. Otherwise software multipy lib is used
229 prompt "ARC700 MMU Version"
230 default ARC_MMU_V3 if ARC_CPU_770
231 default ARC_MMU_V2 if ARC_CPU_750D
241 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
242 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
246 depends on ARC_CPU_770
248 Introduced with ARC700 4.10: New Features
249 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
250 Shared Address Spaces (SASID)
256 prompt "MMU Page Size"
257 default ARC_PAGE_SIZE_8K
259 config ARC_PAGE_SIZE_8K
262 Choose between 8k vs 16k
264 config ARC_PAGE_SIZE_16K
266 depends on ARC_MMU_V3
268 config ARC_PAGE_SIZE_4K
270 depends on ARC_MMU_V3
274 config ARC_COMPACT_IRQ_LEVELS
275 bool "ARCompact IRQ Priorities: High(2)/Low(1)"
277 # Timer HAS to be high priority, for any other high priority config
279 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
280 depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
282 if ARC_COMPACT_IRQ_LEVELS
295 config ARC_FPU_SAVE_RESTORE
296 bool "Enable FPU state persistence across context switch"
299 Double Precision Floating Point unit had dedictaed regs which
300 need to be saved/restored across context-switch.
301 Note that ARC FPU is overly simplistic, unlike say x86, which has
302 hardware pieces to allow software to conditionally save/restore,
303 based on actual usage of FPU by a task. Thus our implemn does
304 this for all tasks in system.
309 menuconfig ARC_CPU_REL_4_10
310 bool "Enable support for Rel 4.10 features"
313 -ARC770 (and dependent features) enabled
314 -ARC750 also shares some of the new features with 770
317 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
319 depends on ARC_CPU_770 && !ARC_CANT_LLSC
322 bool "Insn: SWAPE (endian-swap)"
324 depends on ARC_CPU_REL_4_10
327 bool "Insn: RTSC (64-bit r/o cycle counter)"
329 depends on ARC_CPU_REL_4_10
330 # if SMP, enable RTSC only if counter is coherent across cores
331 depends on !SMP || ARC_HAS_COH_RTSC
333 endmenu # "ARC CPU Configuration"
335 config LINUX_LINK_BASE
336 hex "Linux Link Address"
339 ARC700 divides the 32 bit phy address space into two equal halves
340 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
341 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
342 Typically Linux kernel is linked at the start of untransalted addr,
343 hence the default value of 0x8zs.
344 However some customers have peripherals mapped at this addr, so
345 Linux needs to be scooted a bit.
346 If you don't know what the above means, leave this setting alone.
348 config ARC_CURR_IN_REG
349 bool "Dedicate Register r25 for current_task pointer"
352 This reserved Register R25 to point to Current Task in
353 kernel mode. This saves memory access for each such access
356 config ARC_MISALIGN_ACCESS
357 bool "Emulate unaligned memory access (userspace only)"
359 select SYSCTL_ARCH_UNALIGN_NO_WARN
360 select SYSCTL_ARCH_UNALIGN_ALLOW
362 This enables misaligned 16 & 32 bit memory access from user space.
363 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
364 potential bugs in code
367 int "Timer Frequency"
370 config ARC_METAWARE_HLINK
371 bool "Support for Metaware debugger assisted Host access"
374 This options allows a Linux userland apps to directly access
375 host file system (open/creat/read/write etc) with help from
376 Metaware Debugger. This can come in handy for Linux-host communication
377 when there is no real usable peripheral such as EMAC.
383 config ARC_DW2_UNWIND
384 bool "Enable DWARF specific kernel stack unwind"
389 Compiles the kernel with DWARF unwind information and can be used
390 to get stack backtraces.
392 If you say Y here the resulting kernel image will be slightly larger
393 but not slower, and it will give very useful debugging information.
394 If you don't debug the kernel, you can say N, but we may not be able
395 to solve problems without frame unwind information
397 config ARC_DBG_TLB_PARANOIA
398 bool "Paranoia Checks in Low Level TLB Handlers"
402 config ARC_DBG_TLB_MISS_COUNT
403 bool "Profile TLB Misses"
408 Counts number of I and D TLB Misses and exports them via Debugfs
409 The counters can be cleared via Debugfs as well
412 bool "Support U-boot kernel command line passing"
415 If you are using U-boot (www.denx.de) and wish to pass the kernel
416 command line from the U-boot environment to the Linux kernel then
417 switch this option on.
418 ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
419 to it. kernel startup code will append this to DeviceTree
420 /bootargs provided cmdline args.
422 config ARC_BUILTIN_DTB_NAME
423 string "Built in DTB"
425 Set the name of the DTB to embed in the vmlinux binary
426 Leaving it blank selects the minimal "skeleton" dtb
428 source "kernel/Kconfig.preempt"
430 menu "Executable file formats"
431 source "fs/Kconfig.binfmt"
434 endmenu # "ARC Architecture Configuration"
438 source "drivers/Kconfig"
440 source "arch/arc/Kconfig.debug"
441 source "security/Kconfig"
442 source "crypto/Kconfig"