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drivers/mrc_cache: Always generate an FMAP region

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This automatically generates an FMAP region for the MRC_CACHE driver
which is easier to handle than a cbfsfile.

Adds some spaces and more comments to Makefile.inc to improve
readability.

Tested on Thinkpad x200 with some proof of concept patches.

Change-Id: Iaaca36b1123b094ec1bbe5df4fb25660919173ca
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/23150
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Arthur Heymans
2018-01-07 23:12:49 +01:00
parent 1e931f3e47
commit 82aa8338c7
6 changed files with 69 additions and 43 deletions
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19
src/drivers/mrc_cache/mrc_cache.c
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@@ -98,26 +98,9 @@ static const struct cache_region *cache_regions[] = {
static int lookup_region_by_name(const char *name, struct region *r)
{
/* This assumes memory mapped boot media just under 4GiB. */
const uint32_t pointer_base_32bit = -CONFIG_ROM_SIZE;
if (fmap_locate_area(name, r) == 0)
return 0;
/* CHROMEOS builds must get their MRC cache from FMAP. */
if (IS_ENABLED(CONFIG_CHROMEOS)) {
printk(BIOS_ERR, "MRC: Chrome OS lookup failure.\n");
return -1;
}
if (!IS_ENABLED(CONFIG_BOOT_DEVICE_MEMORY_MAPPED))
return -1;
/* Base is in the form of a pointer. Make it an offset. */
r->offset = CONFIG_MRC_SETTINGS_CACHE_BASE - pointer_base_32bit;
r->size = CONFIG_MRC_SETTINGS_CACHE_SIZE;
return 0;
return -1;
}
static const struct cache_region *lookup_region_type(int type)