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drivers/intel/fsp2_0: add option to compress FSP-M in cbfs

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Allow the ability for chipset or mainboard to choose to
compress FSP-M in cbfs using LZMA or LZ4 routines. However, only
non-XIP platforms will support FSP-M compression. Since the main
cbfs decompression paths are utilized add the appropriate checks
for including compression algorithms under the FSP-M compression
options.

On picasso FSP-M (debug builds) the following savings were measured:
no-compression:
	fspm.bin	720896	none
FSP_COMPRESS_FSP_M_LZ4:
	fspm.bin	138379	LZ4  (720896 decompressed)	-80%
FSP_COMPRESS_FSP_M_LZMA:
	fspm.bin	98921	LZMA (720896 decompressed)	-86%

BUG=b:155322763,b:150746858,b:152909132

Change-Id: I5c88510c134b56a36ff1cd97a64b51ab2fea0ab0
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41450
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
This commit is contained in:
Aaron Durbin
2020-05-15 17:01:58 -06:00
parent 7729b29a58
commit ecbfa99f64
6 changed files with 105 additions and 68 deletions
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12
src/lib/cbfs.c
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@@ -99,10 +99,20 @@ static inline bool fsps_env(void)
return false;
}
static inline bool fspm_env(void)
{
/* FSP-M is assumed to be loaded in romstage. */
if (ENV_ROMSTAGE)
return true;
return false;
}
static inline bool cbfs_lz4_enabled(void)
{
if (fsps_env() && CONFIG(FSP_COMPRESS_FSP_S_LZ4))
return true;
if (fspm_env() && CONFIG(FSP_COMPRESS_FSP_M_LZ4))
return true;
if ((ENV_BOOTBLOCK || ENV_SEPARATE_VERSTAGE) && !CONFIG(COMPRESS_PRERAM_STAGES))
return false;
@@ -114,6 +124,8 @@ static inline bool cbfs_lzma_enabled(void)
{
if (fsps_env() && CONFIG(FSP_COMPRESS_FSP_S_LZMA))
return true;
if (fspm_env() && CONFIG(FSP_COMPRESS_FSP_M_LZMA))
return true;
/* We assume here romstage and postcar are never compressed. */
if (ENV_BOOTBLOCK || ENV_SEPARATE_VERSTAGE)
return false;