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arch: common: Add user can specify the nocache location

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nocache ram is usually used by DMA to transfer data between
peripherals and ram. Some chips use isolated nocache ram,
which does not necessarily have to be in RAMABLE-REGION.
By specifying the zephyr,nocache-ram options, users can specify
the region where nocache-ram is located. If the user does not
specify it, it defaults to RAMABLE-REGION.

Signed-off-by: Weiwei Guo <guoweiwei@syriusrobotics.com>
This commit is contained in:
Weiwei Guo 2024-08-13 18:09:07 +08:00 • committed by Carles Cufí
commit 88f6851a3d
1 changed files with 7 additions and 1 deletions
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8
arch/common/nocache.ld
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@ -7,6 +7,12 @@
/* Copied from linker.ld */ /* Copied from linker.ld */
#if DT_NODE_HAS_STATUS(DT_CHOSEN(zephyr_nocache_ram), okay)
#define NOCACHE_REGION LINKER_DT_NODE_REGION_NAME_TOKEN(DT_CHOSEN(zephyr_nocache_ram))
#else
#define NOCACHE_REGION RAMABLE_REGION
#endif
/* Non-cached region of RAM */ /* Non-cached region of RAM */
SECTION_DATA_PROLOGUE(_NOCACHE_SECTION_NAME,(NOLOAD),) SECTION_DATA_PROLOGUE(_NOCACHE_SECTION_NAME,(NOLOAD),)
{ {
@ -27,5 +33,5 @@ SECTION_DATA_PROLOGUE(_NOCACHE_SECTION_NAME,(NOLOAD),)
MPU_ALIGN(_nocache_ram_size); MPU_ALIGN(_nocache_ram_size);
#endif #endif
_nocache_ram_end = .; _nocache_ram_end = .;
} GROUP_DATA_LINK_IN(RAMABLE_REGION, RAMABLE_REGION) } GROUP_DATA_LINK_IN(NOCACHE_REGION, NOCACHE_REGION)
_nocache_ram_size = _nocache_ram_end - _nocache_ram_start; _nocache_ram_size = _nocache_ram_end - _nocache_ram_start;