nb/intel/e7505: Leave ROM as un-cacheable in postcar

Collected timestamps indicate LZMA decompression of ramstage
is 4x slower when ROM is marked WP-cacheable, in contrast to
having ROM as US. A simple copy WP->WB with uncompressed
ramstage also appeared to be twice as slow as UC->WB copy.

It should be noted that if POSTCAR_STAGE was removed from build,
un-lzma takes 130 seconds instead of 45 milliseconds.

Change-Id: I2cf995395ef2d303ad0bc044dbfa160990a705d0
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/27164
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

0 files changed, 0 insertions, 0 deletions