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| author | Vincent Palatin <vpalatin@chromium.org> | 2018-03-01 16:45:40 +0100 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2018-03-02 06:49:06 -0800 |
| commit | f23f45e74e4c0aff7116a832556d194747997ffe (patch) | |
| tree | 348f7a5a727346f0317155b84938488c68e78a48 /include | |
| parent | c55f09496009249426574e1facf96a222b4e4693 (diff) | |
| download | chrome-ec-f23f45e74e4c0aff7116a832556d194747997ffe.tar.gz | |
cortex-m: enable I-cache on ARMv7-M
The ARMv7-M ISA defines standard (and optional) mechanism to manage the
CPU caches through the SCB (System Control Block) registers.
So far, only the Cortex-M7 core implements such as a mechanism (e.g. the
Cortex-M4 with caches we have are using a proprietary mechanism for the
management).
Define the functions to use the I-Cache,
and enable them on STM32H7 which is our only supported Cortex-M7 core.
The D-Cache mechanism is still To Be Done, as it involves a bit more
support in the firmware for the DMA memory areas.
Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
BRANCH=none
BUG=b:67081508
TEST=on ZerbleBarn, verify manually that the 'IC' bit is set in the CCR
(e.g. 'rw 0xe000ed14' returns 0x60218), and runs some CPU workload
without crash and with a speed-up.
Change-Id: I6af1021d65048b787630387f7d95797db15d069c
Reviewed-on: https://chromium-review.googlesource.com/943445
Commit-Ready: Vincent Palatin <vpalatin@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/config.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/config.h b/include/config.h index 8d023c54ba..bdf40ec722 100644 --- a/include/config.h +++ b/include/config.h @@ -187,6 +187,12 @@ /* Support AP Warm reset Interrupt. */ #undef CONFIG_AP_WARM_RESET_INTERRUPT +/* + * Enable support for CPU caches behaving according to the ARMv7-M ISA. + * (so far, only the Cortex-M7 has such caches) + */ +#undef CONFIG_ARMV7M_CACHE + /* Allow proprietary communication protocols' extensions. */ #undef CONFIG_EXTENSION_COMMAND |