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1 # SPDX-License-Identifier: GPL-2.0
17 A 32-bit RISC microprocessor based on the ARM7 processor core
36 A 32-bit RISC processor with 8kByte Cache, Write Buffer and
53 A 32-bit RISC processor with 8KB cache or 4KB variants,
54 write buffer and MPU(Protection Unit) built around
69 A 32-bit RISC microprocessor based on the ARM9 processor core
166 Branch Target Buffer, Unified TLB and cache line size 16.
182 ARM940T is a member of the ARM9TDMI family of general-
184 instruction and 4KB data cases, each with a 4-word line
190 # ARM946E-S
201 ARM946E-S is a member of the ARM9E-S family of high-
202 performance, 32-bit system-on-chip processor solutions.
203 The TCM and ARMv5TE 32-bit instruction set is supported.
205 Say Y if you want support for the ARM946E-S processor.
208 # ARM1020 - needs validating
222 with an addition of a floating-point unit.
227 # ARM1020E - needs validating
255 embedded trace macrocell, and a floating-point unit.
260 # ARM1026EJ-S
272 The ARM1026EJ-S is an implementation of the ARMv5TEJ architecture
275 Say Y if you want support for the ARM1026EJ-S processor.
291 The Intel StrongARM(R) SA-110 is a 32-bit microprocessor and
296 Say Y if you want support for the SA-110 processor.
364 Relevant for Feroceon-1850 and early Feroceon-2850.
554 # The copy-page model
590 Feroceon TLB (v4wbi with non-outer-cachable page table walks).
596 and invalidate instruction cache entry. Branch target buffer is
637 and to handle IO-space as a special type of memory by assigning
651 interrupts supported by the NVIC on Cortex-M family.
656 # CPU supports 36-bit I/O
664 bool "Support for the Large Physical Address Extension"
673 processors without the LPA extension.
700 bool "Enable ThumbEE CPU extension"
703 Say Y here if you have a CPU with the ThumbEE extension and code to
711 Extensions to install hypervisors without run-time firmware
750 bool "Built little-endian kernel"
752 Say Y if you plan on running a kernel in little-endian mode.
757 bool "Build big-endian kernel"
760 Say Y if you plan on running a kernel in big-endian mode.
762 but requires big-endian user space.
764 The only ARMv5 platform with big-endian support is
774 Support for the BE-8 (big-endian) mode on ARMv6 and ARMv7 processors.
781 Support for the BE-32 (big-endian) mode on pre-ARMv6 processors.
795 bool "Disable I-Cache (I-bit)"
802 bool "Workaround for I-Cache line size mismatch between CPU cores"
805 Some big.LITTLE systems have I-Cache line size mismatch between
807 proper I-Cache support on such systems. If unsure, say N.
810 bool "Disable D-Cache (C-bit)"
820 default 0x00002000 # default size for ARM946E-S
823 ARM946E-S case, it can vary from 0KB to 1MB.
830 bool "Force write through D-cache"
841 Say Y here to use the predictable round-robin cache replacement
859 Speculation attacks against some high-performance processors rely
866 This config option will take CPU-specific actions to harden
878 Speculation attacks against some high-performance processors can
887 An SMP system using a pre-ARMv6 processor (there are apparently
949 that can be used to drain the write buffer of the outer cache.
952 bool "Enable the Broadcom Brahma-B15 read-ahead cache controller"
956 This option enables the Broadcom Brahma-B15 read-ahead cache
957 controller. If disabled, the read-ahead cache remains off.
1034 the store buffer still remains when the operation completes.
1035 This means that the store buffer is always asked to drain and
1039 This has the same effect as the cache sync operation: store buffer
1043 bool "PL310 errata: no automatic Store Buffer drain"
1045 On revisions of the PL310 prior to r3p2, the Store Buffer does
1046 not automatically drain. This can cause normal, non-cacheable
1050 on systems with an outer cache, the store buffer is drained
1100 bool "Use non-cacheable memory for DMA" if (CPU_V6 || CPU_V6K || CPU_V7M) && !CPU_V7
1116 On some of the beefier ARMv7-M machines (with DMA and write
1126 bool "Make rodata strictly non-executable"
1130 If this is set, rodata will be made explicitly non-executable. This
1133 additional section-aligned split of rodata from kernel text so it
1134 can be made explicitly non-executable. This padding may waste memory