1 comment "Processor Type"
3 # Select CPU types depending on the architecture selected. This selects
4 # which CPUs we support in the kernel image, and the compiler instruction
9 bool "Support ARM610 processor" if ARCH_RPC
14 select CPU_COPY_V3 if MMU
15 select CPU_TLB_V3 if MMU
16 select CPU_PABRT_LEGACY
18 The ARM610 is the successor to the ARM3 processor
19 and was produced by VLSI Technology Inc.
21 Say Y if you want support for the ARM610 processor.
26 bool "Support ARM7TDMI processor"
30 select CPU_PABRT_LEGACY
33 A 32-bit RISC microprocessor based on the ARM7 processor core
34 which has no memory control unit and cache.
36 Say Y if you want support for the ARM7TDMI processor.
41 bool "Support ARM710 processor" if ARCH_RPC
46 select CPU_COPY_V3 if MMU
47 select CPU_TLB_V3 if MMU
48 select CPU_PABRT_LEGACY
50 A 32-bit RISC microprocessor based on the ARM7 processor core
51 designed by Advanced RISC Machines Ltd. The ARM710 is the
52 successor to the ARM610 processor. It was released in
53 July 1994 by VLSI Technology Inc.
55 Say Y if you want support for the ARM710 processor.
60 bool "Support ARM720T processor" if ARCH_INTEGRATOR
63 select CPU_PABRT_LEGACY
67 select CPU_COPY_V4WT if MMU
68 select CPU_TLB_V4WT if MMU
70 A 32-bit RISC processor with 8kByte Cache, Write Buffer and
71 MMU built around an ARM7TDMI core.
73 Say Y if you want support for the ARM720T processor.
78 bool "Support ARM740T processor" if ARCH_INTEGRATOR
82 select CPU_PABRT_LEGACY
83 select CPU_CACHE_V3 # although the core is v4t
86 A 32-bit RISC processor with 8KB cache or 4KB variants,
87 write buffer and MPU(Protection Unit) built around
90 Say Y if you want support for the ARM740T processor.
95 bool "Support ARM9TDMI processor"
99 select CPU_PABRT_LEGACY
102 A 32-bit RISC microprocessor based on the ARM9 processor core
103 which has no memory control unit and cache.
105 Say Y if you want support for the ARM9TDMI processor.
110 bool "Support ARM920T processor" if ARCH_INTEGRATOR
113 select CPU_PABRT_LEGACY
114 select CPU_CACHE_V4WT
115 select CPU_CACHE_VIVT
117 select CPU_COPY_V4WB if MMU
118 select CPU_TLB_V4WBI if MMU
120 The ARM920T is licensed to be produced by numerous vendors,
121 and is used in the Cirrus EP93xx and the Samsung S3C2410.
123 Say Y if you want support for the ARM920T processor.
128 bool "Support ARM922T processor" if ARCH_INTEGRATOR
131 select CPU_PABRT_LEGACY
132 select CPU_CACHE_V4WT
133 select CPU_CACHE_VIVT
135 select CPU_COPY_V4WB if MMU
136 select CPU_TLB_V4WBI if MMU
138 The ARM922T is a version of the ARM920T, but with smaller
139 instruction and data caches. It is used in Altera's
140 Excalibur XA device family and Micrel's KS8695 Centaur.
142 Say Y if you want support for the ARM922T processor.
147 bool "Support ARM925T processor" if ARCH_OMAP1
150 select CPU_PABRT_LEGACY
151 select CPU_CACHE_V4WT
152 select CPU_CACHE_VIVT
154 select CPU_COPY_V4WB if MMU
155 select CPU_TLB_V4WBI if MMU
157 The ARM925T is a mix between the ARM920T and ARM926T, but with
158 different instruction and data caches. It is used in TI's OMAP
161 Say Y if you want support for the ARM925T processor.
166 bool "Support ARM926T processor" if ARCH_INTEGRATOR || MACH_REALVIEW_EB
168 select CPU_ABRT_EV5TJ
169 select CPU_PABRT_LEGACY
170 select CPU_CACHE_VIVT
172 select CPU_COPY_V4WB if MMU
173 select CPU_TLB_V4WBI if MMU
175 This is a variant of the ARM920. It has slightly different
176 instruction sequences for cache and TLB operations. Curiously,
177 there is no documentation on it at the ARM corporate website.
179 Say Y if you want support for the ARM926T processor.
187 select CPU_PABRT_LEGACY
188 select CPU_CACHE_VIVT
191 select CPU_COPY_FA if MMU
192 select CPU_TLB_FA if MMU
194 The FA526 is a version of the ARMv4 compatible processor with
195 Branch Target Buffer, Unified TLB and cache line size 16.
197 Say Y if you want support for the FA526 processor.
202 bool "Support ARM940T processor" if ARCH_INTEGRATOR
205 select CPU_ABRT_NOMMU
206 select CPU_PABRT_LEGACY
207 select CPU_CACHE_VIVT
210 ARM940T is a member of the ARM9TDMI family of general-
211 purpose microprocessors with MPU and separate 4KB
212 instruction and 4KB data cases, each with a 4-word line
215 Say Y if you want support for the ARM940T processor.
220 bool "Support ARM946E-S processor" if ARCH_INTEGRATOR
223 select CPU_ABRT_NOMMU
224 select CPU_PABRT_LEGACY
225 select CPU_CACHE_VIVT
228 ARM946E-S is a member of the ARM9E-S family of high-
229 performance, 32-bit system-on-chip processor solutions.
230 The TCM and ARMv5TE 32-bit instruction set is supported.
232 Say Y if you want support for the ARM946E-S processor.
235 # ARM1020 - needs validating
237 bool "Support ARM1020T (rev 0) processor" if ARCH_INTEGRATOR
240 select CPU_PABRT_LEGACY
241 select CPU_CACHE_V4WT
242 select CPU_CACHE_VIVT
244 select CPU_COPY_V4WB if MMU
245 select CPU_TLB_V4WBI if MMU
247 The ARM1020 is the 32K cached version of the ARM10 processor,
248 with an addition of a floating-point unit.
250 Say Y if you want support for the ARM1020 processor.
253 # ARM1020E - needs validating
255 bool "Support ARM1020E processor" if ARCH_INTEGRATOR
258 select CPU_PABRT_LEGACY
259 select CPU_CACHE_V4WT
260 select CPU_CACHE_VIVT
262 select CPU_COPY_V4WB if MMU
263 select CPU_TLB_V4WBI if MMU
268 bool "Support ARM1022E processor" if ARCH_INTEGRATOR
271 select CPU_PABRT_LEGACY
272 select CPU_CACHE_VIVT
274 select CPU_COPY_V4WB if MMU # can probably do better
275 select CPU_TLB_V4WBI if MMU
277 The ARM1022E is an implementation of the ARMv5TE architecture
278 based upon the ARM10 integer core with a 16KiB L1 Harvard cache,
279 embedded trace macrocell, and a floating-point unit.
281 Say Y if you want support for the ARM1022E processor.
286 bool "Support ARM1026EJ-S processor" if ARCH_INTEGRATOR
288 select CPU_ABRT_EV5T # But need Jazelle, but EV5TJ ignores bit 10
289 select CPU_PABRT_LEGACY
290 select CPU_CACHE_VIVT
292 select CPU_COPY_V4WB if MMU # can probably do better
293 select CPU_TLB_V4WBI if MMU
295 The ARM1026EJ-S is an implementation of the ARMv5TEJ architecture
296 based upon the ARM10 integer core.
298 Say Y if you want support for the ARM1026EJ-S processor.
303 bool "Support StrongARM(R) SA-110 processor" if ARCH_RPC
304 select CPU_32v3 if ARCH_RPC
305 select CPU_32v4 if !ARCH_RPC
307 select CPU_PABRT_LEGACY
308 select CPU_CACHE_V4WB
309 select CPU_CACHE_VIVT
311 select CPU_COPY_V4WB if MMU
312 select CPU_TLB_V4WB if MMU
314 The Intel StrongARM(R) SA-110 is a 32-bit microprocessor and
315 is available at five speeds ranging from 100 MHz to 233 MHz.
316 More information is available at
317 <http://developer.intel.com/design/strong/sa110.htm>.
319 Say Y if you want support for the SA-110 processor.
327 select CPU_PABRT_LEGACY
328 select CPU_CACHE_V4WB
329 select CPU_CACHE_VIVT
331 select CPU_TLB_V4WB if MMU
338 select CPU_PABRT_LEGACY
339 select CPU_CACHE_VIVT
341 select CPU_TLB_V4WBI if MMU
343 # XScale Core Version 3
348 select CPU_PABRT_LEGACY
349 select CPU_CACHE_VIVT
351 select CPU_TLB_V4WBI if MMU
354 # Marvell PJ1 (Mohawk)
359 select CPU_PABRT_LEGACY
360 select CPU_CACHE_VIVT
362 select CPU_TLB_V4WBI if MMU
363 select CPU_COPY_V4WB if MMU
370 select CPU_PABRT_LEGACY
371 select CPU_CACHE_VIVT
373 select CPU_COPY_FEROCEON if MMU
374 select CPU_TLB_FEROCEON if MMU
376 config CPU_FEROCEON_OLD_ID
377 bool "Accept early Feroceon cores with an ARM926 ID"
378 depends on CPU_FEROCEON && !CPU_ARM926T
381 This enables the usage of some old Feroceon cores
382 for which the CPU ID is equal to the ARM926 ID.
383 Relevant for Feroceon-1850 and early Feroceon-2850.
387 bool "Support ARM V6 processor" if ARCH_INTEGRATOR || MACH_REALVIEW_EB || MACH_REALVIEW_PBX || ARCH_DOVE
392 select CPU_CACHE_VIPT
394 select CPU_HAS_ASID if MMU
395 select CPU_COPY_V6 if MMU
396 select CPU_TLB_V6 if MMU
400 bool "Support ARM V6K processor extensions" if !SMP
402 default y if SMP && !(ARCH_MX3 || ARCH_OMAP2)
404 Say Y here if your ARMv6 processor supports the 'K' extension.
405 This enables the kernel to use some instructions not present
406 on previous processors, and as such a kernel build with this
407 enabled will not boot on processors with do not support these
412 bool "Support ARM V7 processor" if ARCH_INTEGRATOR || MACH_REALVIEW_EB || MACH_REALVIEW_PBX
413 select CPU_32v6K if !ARCH_OMAP2
418 select CPU_CACHE_VIPT
420 select CPU_HAS_ASID if MMU
421 select CPU_COPY_V6 if MMU
422 select CPU_TLB_V7 if MMU
424 # Figure out what processor architecture version we should be using.
425 # This defines the compiler instruction set which depends on the machine type.
428 select TLS_REG_EMUL if SMP || !MMU
429 select NEEDS_SYSCALL_FOR_CMPXCHG if SMP
433 select TLS_REG_EMUL if SMP || !MMU
434 select NEEDS_SYSCALL_FOR_CMPXCHG if SMP
438 select TLS_REG_EMUL if SMP || !MMU
439 select NEEDS_SYSCALL_FOR_CMPXCHG if SMP
443 select TLS_REG_EMUL if SMP || !MMU
444 select NEEDS_SYSCALL_FOR_CMPXCHG if SMP
448 select TLS_REG_EMUL if !CPU_32v6K && !MMU
454 config CPU_ABRT_NOMMU
469 config CPU_ABRT_EV5TJ
478 config CPU_PABRT_LEGACY
494 config CPU_CACHE_V4WT
497 config CPU_CACHE_V4WB
506 config CPU_CACHE_VIVT
509 config CPU_CACHE_VIPT
516 # The copy-page model
526 config CPU_COPY_FEROCEON
535 # This selects the TLB model
539 ARM Architecture Version 3 TLB.
544 ARM Architecture Version 4 TLB with writethrough cache.
549 ARM Architecture Version 4 TLB with writeback cache.
554 ARM Architecture Version 4 TLB with writeback cache and invalidate
555 instruction cache entry.
557 config CPU_TLB_FEROCEON
560 Feroceon TLB (v4wbi with non-outer-cachable page table walks).
565 Faraday ARM FA526 architecture, unified TLB with writeback cache
566 and invalidate instruction cache entry. Branch target buffer is
575 config VERIFY_PERMISSION_FAULT
582 This indicates whether the CPU has the ASID register; used to
583 tag TLB and possibly cache entries.
588 Processor has the CP15 register.
594 Processor has the CP15 register, which has MMU related registers.
600 Processor has the CP15 register, which has MPU related registers.
603 # CPU supports 36-bit I/O
608 comment "Processor Features"
611 bool "Support Thumb user binaries"
612 depends on CPU_ARM720T || CPU_ARM740T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM940T || CPU_ARM946E || CPU_ARM1020 || CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_V6 || CPU_V7 || CPU_FEROCEON
615 Say Y if you want to include kernel support for running user space
618 The Thumb instruction set is a compressed form of the standard ARM
619 instruction set resulting in smaller binaries at the expense of
620 slightly less efficient code.
622 If you don't know what this all is, saying Y is a safe choice.
625 bool "Enable ThumbEE CPU extension"
628 Say Y here if you have a CPU with the ThumbEE extension and code to
629 make use of it. Say N for code that can run on CPUs without ThumbEE.
631 config CPU_BIG_ENDIAN
632 bool "Build big-endian kernel"
633 depends on ARCH_SUPPORTS_BIG_ENDIAN
635 Say Y if you plan on running a kernel in big-endian mode.
636 Note that your board must be properly built and your board
637 port must properly enable any big-endian related features
638 of your chipset/board/processor.
640 config CPU_ENDIAN_BE8
642 depends on CPU_BIG_ENDIAN
643 default CPU_V6 || CPU_V7
645 Support for the BE-8 (big-endian) mode on ARMv6 and ARMv7 processors.
647 config CPU_ENDIAN_BE32
649 depends on CPU_BIG_ENDIAN
650 default !CPU_ENDIAN_BE8
652 Support for the BE-32 (big-endian) mode on pre-ARMv6 processors.
654 config CPU_HIGH_VECTOR
655 depends on !MMU && CPU_CP15 && !CPU_ARM740T
656 bool "Select the High exception vector"
658 Say Y here to select high exception vector(0xFFFF0000~).
659 The exception vector can be vary depending on the platform
660 design in nommu mode. If your platform needs to select
661 high exception vector, say Y.
662 Otherwise or if you are unsure, say N, and the low exception
663 vector (0x00000000~) will be used.
665 config CPU_ICACHE_DISABLE
666 bool "Disable I-Cache (I-bit)"
667 depends on CPU_CP15 && !(CPU_ARM610 || CPU_ARM710 || CPU_ARM720T || CPU_ARM740T || CPU_XSCALE || CPU_XSC3)
669 Say Y here to disable the processor instruction cache. Unless
670 you have a reason not to or are unsure, say N.
672 config CPU_DCACHE_DISABLE
673 bool "Disable D-Cache (C-bit)"
676 Say Y here to disable the processor data cache. Unless
677 you have a reason not to or are unsure, say N.
679 config CPU_DCACHE_SIZE
681 depends on CPU_ARM740T || CPU_ARM946E
682 default 0x00001000 if CPU_ARM740T
683 default 0x00002000 # default size for ARM946E-S
685 Some cores are synthesizable to have various sized cache. For
686 ARM946E-S case, it can vary from 0KB to 1MB.
687 To support such cache operations, it is efficient to know the size
689 If your SoC is configured to have a different size, define the value
690 here with proper conditions.
692 config CPU_DCACHE_WRITETHROUGH
693 bool "Force write through D-cache"
694 depends on (CPU_ARM740T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM940T || CPU_ARM946E || CPU_ARM1020 || CPU_FA526) && !CPU_DCACHE_DISABLE
695 default y if CPU_ARM925T
697 Say Y here to use the data cache in writethrough mode. Unless you
698 specifically require this or are unsure, say N.
700 config CPU_CACHE_ROUND_ROBIN
701 bool "Round robin I and D cache replacement algorithm"
702 depends on (CPU_ARM926T || CPU_ARM946E || CPU_ARM1020) && (!CPU_ICACHE_DISABLE || !CPU_DCACHE_DISABLE)
704 Say Y here to use the predictable round-robin cache replacement
705 policy. Unless you specifically require this or are unsure, say N.
707 config CPU_BPREDICT_DISABLE
708 bool "Disable branch prediction"
709 depends on CPU_ARM1020 || CPU_V6 || CPU_MOHAWK || CPU_XSC3 || CPU_V7 || CPU_FA526
711 Say Y here to disable branch prediction. If unsure, say N.
716 An SMP system using a pre-ARMv6 processor (there are apparently
717 a few prototypes like that in existence) and therefore access to
718 that required register must be emulated.
722 depends on !TLS_REG_EMUL
723 default y if SMP || CPU_32v7
725 This selects support for the CP15 thread register.
726 It is defined to be available on some ARMv6 processors (including
727 all SMP capable ARMv6's) or later processors. User space may
728 assume directly accessing that register and always obtain the
729 expected value only on ARMv7 and above.
731 config NEEDS_SYSCALL_FOR_CMPXCHG
734 SMP on a pre-ARMv6 processor? Well OK then.
735 Forget about fast user space cmpxchg support.
736 It is just not possible.
741 config OUTER_CACHE_SYNC
744 The outer cache has a outer_cache_fns.sync function pointer
745 that can be used to drain the write buffer of the outer cache.
747 config CACHE_FEROCEON_L2
748 bool "Enable the Feroceon L2 cache controller"
749 depends on ARCH_KIRKWOOD || ARCH_MV78XX0
753 This option enables the Feroceon L2 cache controller.
755 config CACHE_FEROCEON_L2_WRITETHROUGH
756 bool "Force Feroceon L2 cache write through"
757 depends on CACHE_FEROCEON_L2
759 Say Y here to use the Feroceon L2 cache in writethrough mode.
760 Unless you specifically require this, say N for writeback mode.
763 bool "Enable the L2x0 outer cache controller"
764 depends on REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || MACH_REALVIEW_PB1176 || \
765 REALVIEW_EB_A9MP || ARCH_MX35 || ARCH_MX31 || MACH_REALVIEW_PBX || \
766 ARCH_NOMADIK || ARCH_OMAP4 || ARCH_U8500 || ARCH_VEXPRESS_CA9X4
769 select OUTER_CACHE_SYNC
771 This option enables the L2x0 PrimeCell.
774 bool "Enable the Tauros2 L2 cache controller"
775 depends on (ARCH_DOVE || ARCH_MMP)
779 This option enables the Tauros2 L2 cache controller (as
783 bool "Enable the L2 cache on XScale3"
788 This option enables the L2 cache on XScale3.
790 config ARM_L1_CACHE_SHIFT
792 default 6 if ARM_L1_CACHE_SHIFT_6
795 config ARM_DMA_MEM_BUFFERABLE
796 bool "Use non-cacheable memory for DMA" if CPU_V6 && !CPU_V7
797 default y if CPU_V6 || CPU_V7
799 Historically, the kernel has used strongly ordered mappings to
800 provide DMA coherent memory. With the advent of ARMv7, mapping
801 memory with differing types results in unpredictable behaviour,
802 so on these CPUs, this option is forced on.
804 Multiple mappings with differing attributes is also unpredictable
805 on ARMv6 CPUs, but since they do not have aggressive speculative
806 prefetch, no harm appears to occur.
808 However, drivers may be missing the necessary barriers for ARMv6,
809 and therefore turning this on may result in unpredictable driver
810 behaviour. Therefore, we offer this as an option.
812 You are recommended say 'Y' here and debug any affected drivers.
814 config ARCH_HAS_BARRIERS
817 This option allows the use of custom mandatory barriers
818 included via the mach/barriers.h file.