Author: svens Date: Mon May 2 21:53:04 2011 New Revision: 6552 URL: https://tracker.coreboot.org/trac/coreboot/changeset/6552
Log: Add option 'compress ramstage'
Add an option to make compression of ramstage configurable. Right now it is always compressed. On my Thinkpad, the complete boot to grub takes 4s, with around 1s required for decompressing ramstage. This is probably caused by the fact the decompression does a lot of single byte/word/qword accesses, which are really slow on SPI buses. So give the user the option to store ramstage uncompressed, if he has enough memory.
Signed-off-by: Sven Schnelle svens@stackframe.org Acked-by: Patrick Georgi patrick@georgi-clan.de
Modified: trunk/Makefile.inc trunk/src/Kconfig
Modified: trunk/Makefile.inc ============================================================================== --- trunk/Makefile.inc Sat Apr 30 02:22:04 2011 (r6551) +++ trunk/Makefile.inc Mon May 2 21:53:04 2011 (r6552) @@ -85,7 +85,11 @@
####################################################################### # a variety of flags for our build +CBFS_COMPRESS_FLAG:= +ifeq ($(CONFIG_COMPRESS_RAMSTAGE),y) CBFS_COMPRESS_FLAG:=l +endif + CBFS_PAYLOAD_COMPRESS_FLAG:= CBFS_PAYLOAD_COMPRESS_NAME:=none ifeq ($(CONFIG_COMPRESSED_PAYLOAD_LZMA),y)
Modified: trunk/src/Kconfig ============================================================================== --- trunk/src/Kconfig Sat Apr 30 02:22:04 2011 (r6551) +++ trunk/src/Kconfig Mon May 2 21:53:04 2011 (r6552) @@ -98,6 +98,14 @@ Enable this option if coreboot shall read options from the "CMOS" NVRAM instead of using hard coded values.
+config COMPRESS_RAMSTAGE + bool "Compress ramstage with LZMA" + default y + help + Compress ramstage to save memory in the flash image. Note + that decompression might slow down booting if the boot flash + is connected through a slow Link (i.e. SPI) + endmenu
source src/mainboard/Kconfig