the following patch was just integrated into master: commit 97e13d84c30c308c3b2bc629b38e6bcc9565dc3a Author: Arthur Heymans arthur@aheymans.xyz Date: Wed Nov 30 18:40:38 2016 +0100
nb/intel/x4x: Fix raminit on reset path
Previously the raminit failed on hot reset and to work around this issue it unconditionally did a cold reset.
This has the following issues: * it's slow; * when the OS issues a hot reset some disk drives expect their 5V power supply to remain on, which gets cut off by a cold reset, causing data corruption.
To fix this some steps in raminit must be ommited on the reset path. This includes receive enable calibration. To achieve this it stores receive enable results in RTC nvram for them to be rewritten on the resume path. Note: The same thing needs to be done on the S3 resume path.
Calling a hot reset after raminit "outb(0x6, 0cf9)" works.
Change-Id: I6601dd90aebd071a0de7cec070487b0f9845bc30 Signed-off-by: Arthur Heymans arthur@aheymans.xyz Reviewed-on: https://review.coreboot.org/18009 Tested-by: build bot (Jenkins) Reviewed-by: Nico Huber nico.h@gmx.de
See https://review.coreboot.org/18009 for details.
-gerrit