Vincent Palatin b42dd73603
core: add chip-specific memory regions definition mechanism ...
When a chip has special/non-contiguous SRAM physical memory region,
rather than extending the generic linker file ad nauseam, define a
mechanism to declare a chip specific list of those regions.
To do so, a chip must declare the CONFIG_CHIP_MEMORY_REGIONS
configuration and have a memory_regions.inc with the list of regions.
The special-purpose preprocessed chip/<chip_name>/memory_regions.inc
file has one region declaration per line using the following macro:
REGION(name, attributes, start_address, size)
Each region will get a proper MEMORY entry and a section in the linker
file.
the __SECTION(region_name) helper is provided as a convenience to
declare variable in a specific region.
Note: those 'special' regions are NOT cleared at startup contrary to
.bss.
Signed-off-by: Vincent Palatin <vpalatin@chromium.org >
BRANCH=none
BUG=b:67081508
TEST=on ZerbleBarn, along with the following CLs, run the firmware with
large arrays in special AHB memory regions.
Change-Id: I3f156ef6e5feb4a6a0b2ae2468bae8a20483f17c
Reviewed-on: https://chromium-review.googlesource.com/946368
Commit-Ready: Vincent Palatin <vpalatin@chromium.org >
Tested-by: Vincent Palatin <vpalatin@chromium.org >
Reviewed-by: Randall Spangler <rspangler@chromium.org >
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b42dd73603