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
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@ -85,7 +85,11 @@ cbfs-files-handler= \
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#######################################################################
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# a variety of flags for our build
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CBFS_COMPRESS_FLAG:=
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ifeq ($(CONFIG_COMPRESS_RAMSTAGE),y)
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CBFS_COMPRESS_FLAG:=l
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endif
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CBFS_PAYLOAD_COMPRESS_FLAG:=
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CBFS_PAYLOAD_COMPRESS_NAME:=none
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ifeq ($(CONFIG_COMPRESSED_PAYLOAD_LZMA),y)
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@ -98,6 +98,14 @@ config USE_OPTION_TABLE
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Enable this option if coreboot shall read options from the "CMOS"
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NVRAM instead of using hard coded values.
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config COMPRESS_RAMSTAGE
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bool "Compress ramstage with LZMA"
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default y
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help
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Compress ramstage to save memory in the flash image. Note
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that decompression might slow down booting if the boot flash
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is connected through a slow Link (i.e. SPI)
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endmenu
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source src/mainboard/Kconfig
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