diff options
| author | Duncan Laurie <dlaurie@chromium.org> | 2012-06-23 16:37:45 -0700 |
|---|---|---|
| committer | Ronald G. Minnich <rminnich@gmail.com> | 2012-07-25 00:47:10 +0200 |
| commit | f4d362339f4d96657be1dc5956c34278d1089eba (patch) | |
| tree | 4f07a246238d953f054e8aa3937a65c259529081 /src/drivers/elog/Kconfig | |
| parent | 472ec9cd7ecb3d283bc05941c7dbb54a10813614 (diff) | |
ELOG: Add support for a monotonic boot counter in CMOS
This maintains a 32bit monotonically increasing boot counter
that is stored in CMOS and logged on every non-S3 boot when
the event log is initialized.
In CMOS the count is prefixed with a 16bit signature and
appended with a 16bit checksum.
This counter is incremented in sandybridge early_init which is
called by romstage. It is incremented early in order notice
when reboots happen after memory init.
The counter is then logged when ELOG is initialized and will
store the boot count as part of a 'System boot; event.
Reboot a few times and look for 'System boot' events in the
event log and check that they are increasing. Also verify
that the counter does NOT increase when resuming from S3.
171 | 2012-06-23 16:02:55 | System boot | 285
176 | 2012-06-23 16:26:00 | System boot | 286
182 | 2012-06-23 16:27:04 | System boot | 287
189 | 2012-06-23 16:31:10 | System boot | 288
Change-Id: I23faeafcf155edfd10aa6882598b3883575f8a33
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/1315
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Diffstat (limited to 'src/drivers/elog/Kconfig')
| -rw-r--r-- | src/drivers/elog/Kconfig | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/src/drivers/elog/Kconfig b/src/drivers/elog/Kconfig index d61dd10857..867416cc77 100644 --- a/src/drivers/elog/Kconfig +++ b/src/drivers/elog/Kconfig @@ -67,3 +67,20 @@ config ELOG_SHRINK_SIZE Default is 1K. endif + +config ELOG_BOOT_COUNT + depends on ELOG + bool "Maintain a monotonic boot number in CMOS" + default n + help + Store a monotonic boot number in CMOS and provide an interface + to read the current value and increment the counter. This boot + counter will be logged as part of the System Boot event. + +config ELOG_BOOT_COUNT_CMOS_OFFSET + depends on ELOG && ELOG_BOOT_COUNT && !USE_OPTION_TABLE + int "Offset in CMOS to store the boot count" + default 0 + help + This value must be greater than 16 bytes so as not to interfere + with the standard RTC region. Requires 8 bytes. |