Aaron Durbin (adurbin@google.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/5040
-gerrit
commit 84dfaa01c27d221fd38993f763c2e1de1356591e Author: Aaron Durbin adurbin@chromium.org Date: Thu Jan 9 14:35:41 2014 -0600
baytrail: reboot with EC in S0 with no MRC cache and EC in RW
This improves boot time in 2 ways for a firmware upgrade:
1. Normally MRC would detect the S0 state without an MRC cache even though it's told to the S5 path. When it observes this state a cold reset occurs. The cold reset stays in S5 for at least 4 seconds which is time observed by the end user.
2. As the EC was running RW code before the reset after firmware upgrade it will still be running the older RW code. Vboot will then reboot the EC and the whole system to put the EC into RO mode so it can handle the RW update.
The issues are mitigated by detecting the system is in S0 with no MRC cache and the EC isn't in RO mode. Therefore we can do the reboot without waiting the 4 secs and the EC is running RO so the 2nd reboot is not necessary.
BUG=chrome-os-partner:24133 BRANCH=rambi,squawks TEST=Booted. Updated firmware while in OS. Rebooted. Noted the EC reboot before MRC execution.
Change-Id: I1c53d334a5e18c237a74ffbe96f263a7540cd8fe Signed-off-by: Aaron Durbin adurbin@chromium.org Reviewed-on: https://chromium-review.googlesource.com/182061 Reviewed-by: Duncan Laurie dlaurie@chromium.org --- src/soc/intel/baytrail/romstage/raminit.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/src/soc/intel/baytrail/romstage/raminit.c b/src/soc/intel/baytrail/romstage/raminit.c index 352b86f..752a49b 100644 --- a/src/soc/intel/baytrail/romstage/raminit.c +++ b/src/soc/intel/baytrail/romstage/raminit.c @@ -32,6 +32,8 @@ #include <baytrail/pci_devs.h> #include <baytrail/reset.h> #include <baytrail/romstage.h> +#include <ec/google/chromeec/ec.h> +#include <ec/google/chromeec/ec_commands.h>
static void reset_system(void) { @@ -131,6 +133,12 @@ void raminit(struct mrc_params *mp, int prev_sleep_state) reset_system(); } else { printk(BIOS_DEBUG, "No MRC cache found.\n"); +#if CONFIG_EC_GOOGLE_CHROMEEC + if (prev_sleep_state == 0) { + /* Ensure EC is running RO firmware. */ + google_chromeec_check_ec_image(EC_IMAGE_RO); + } +#endif }
mrc_entry = cbfs_get_file_content(CBFS_DEFAULT_MEDIA, "mrc.bin", 0xab,