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authorJeremy Compostella <jeremy.compostella@intel.com>2023-08-18 14:25:22 -0700
committerMatt DeVillier <matt.devillier@amd.corp-partner.google.com>2023-10-20 14:32:44 +0000
commit052fb7c45136263ed194c24fd4d04488a2608fd3 (patch)
tree951b5614c6d21459394a4b6a22d741daa711d6c3 /src/arch/x86
parent621ccf8a975de10a641ba36c9f8065b7fb659611 (diff)
x86: Add pre-memory stages CBFS cache scratchpad support
Having a CBFS cache scratchpad offers a generic way to decompress CBFS files through the cbfs_map() function without having to reserve a per-file specific memory region. This commit introduces the x86 `PRERAM_CBFS_CACHE_SIZE' Kconfig to set the pre-memory stages CBFS cache size. A cache size of zero disables the CBFS cache feature. The default value is 16 KB which seems a reasonable minimal value enough to satisfy basic needs such as the decompression of a small configuration file. This setting can be adjusted depending on the platform needs and capabilities. We have set this size to zero for all the platforms without enough space in Cache-As-RAM to accommodate the default size. TEST=Decompression of vbt.bin in romstage on rex using cbfs_map() Change-Id: Iee493f9947fddcc57576f04c3d6a2d58c7368e09 Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/77290 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Diffstat (limited to 'src/arch/x86')
-rw-r--r--src/arch/x86/Kconfig7
-rw-r--r--src/arch/x86/car.ld3
2 files changed, 10 insertions, 0 deletions
diff --git a/src/arch/x86/Kconfig b/src/arch/x86/Kconfig
index c97fecb3e4..b0e479b1c4 100644
--- a/src/arch/x86/Kconfig
+++ b/src/arch/x86/Kconfig
@@ -153,6 +153,13 @@ config CBFS_MCACHE_SIZE
Increase this value if you see CBFS mcache overflow warnings. Do NOT
change this value for vboot RW updates!
+config PRERAM_CBFS_CACHE_SIZE
+ hex
+ default 0x4000
+ help
+ Define the size of the Pre-RAM stages CBFS cache. A size of
+ zero disables the CBFS cache feature in pre-memory stages.
+
config PC80_SYSTEM
bool
default y if ARCH_X86
diff --git a/src/arch/x86/car.ld b/src/arch/x86/car.ld
index 14fdba6331..2ad1ca2cd8 100644
--- a/src/arch/x86/car.ld
+++ b/src/arch/x86/car.ld
@@ -51,6 +51,9 @@
FMAP_CACHE(., FMAP_SIZE)
#endif
+ . = ALIGN(CONFIG_CBFS_CACHE_ALIGN);
+ CBFS_CACHE(., CONFIG_PRERAM_CBFS_CACHE_SIZE)
+
/* Reserve sizeof(struct ehci_dbg_info). */
REGION(car_ehci_dbg_info, ., 80, 1)