the following patch was just integrated into master: commit 12b121f3fef61d6a346c2575266a9cb46bb9d31f Author: Hung-Te Lin hungte@chromium.org Date: Tue Sep 24 15:51:05 2013 +0800
arm/exynos: Allow releasing UART retention for resume.
The UART / serial console is put in retention state by kernel during suspend / resume path, which caused Coreboot not able to print any messages during resume.
Sending values to the padret_uart_opt inside PMU may release UART, but that may also cause unexpected output when kernel is back. However, it's still very helpful when we are debugging suspend/resume inside Coreboot.
To get UART message on resume, call wakeup_enable_uart() in boot block or romstage (before console_init).
Change-Id: Ib5759cb402c6e018d9dba14fad8b61f6a1b1a265 Reviewed-on: https://chromium-review.googlesource.com/170440 Tested-by: Hung-Te Lin hungte@chromium.org Reviewed-by: Hung-Te Lin hungte@chromium.org Commit-Queue: Hung-Te Lin hungte@chromium.org (cherry picked from commit 547fbbfe2eeb6da4e161f36be2caf8099f9eac9b) Signed-off-by: Isaac Christensen isaac.christensen@se-eng.com Reviewed-on: http://review.coreboot.org/6649 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich rminnich@gmail.com
See http://review.coreboot.org/6649 for details.
-gerrit