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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>

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6552 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Sven Schnelle 2011-05-02 19:53:04 +00:00
parent 4ee7d80e06
commit 8eee19d0ea
2 changed files with 12 additions and 0 deletions
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4
Makefile.inc
View File

@ -85,7 +85,11 @@ cbfs-files-handler= \
#######################################################################
# 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)

8
src/Kconfig
View File

@ -98,6 +98,14 @@ config USE_OPTION_TABLE
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