diff options
| author | Vadim Bendebury <vbendeb@chromium.org> | 2015-03-12 18:58:13 -0700 |
|---|---|---|
| committer | ChromeOS Commit Bot <chromeos-commit-bot@chromium.org> | 2015-03-13 21:36:25 +0000 |
| commit | 7b50512ccf17f1a0f138c2ef2bb5d3984e0e89de (patch) | |
| tree | 3886256032cfbe154a5fc6726240a88f0a9ca411 /host | |
| parent | d574f070c52f913790dd0c69b178de3dbeac3078 (diff) | |
| download | vboot-7b50512ccf17f1a0f138c2ef2bb5d3984e0e89de.tar.gz | |
vboot: allow firmware to signal a wipeout request
It has become necessary to be able to "factory reset" certain devices
on firmware request. The best mechanism for this is NVRAM, as the
request needs to be detected very early in the boot process, before
other means of communications with the upper layers are available.
A previously unused NVRAM bit (bit 0x08 at offset zero) is taken for
this purpose.
A new flag is introduced to allow the firmware to signal the need to
assert this bit.
A new variable name/parameter ('wipeout_request') added to crossystem
to provide user space access to the setting of the dedicated NVRAM
bit.
BRANCH=storm
BUG=chrome-os-partner:37219
TEST=with all the patches applied, on storm, holding the recovery
button at startup for 10 seconds, causes 'crossystem
wipeout_request' to report '1'.
Change-Id: If1f6f061ce5b3f357b92aaa74cb129671dc30446
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/259857
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Diffstat (limited to 'host')
| -rw-r--r-- | host/lib/crossystem.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/host/lib/crossystem.c b/host/lib/crossystem.c index 43dcc2a4..1eef737b 100644 --- a/host/lib/crossystem.c +++ b/host/lib/crossystem.c @@ -496,6 +496,8 @@ int VbGetSystemPropertyInt(const char* name) { value = VbGetNvStorage(VBNV_OPROM_NEEDED); } else if (!strcasecmp(name,"recovery_subcode")) { value = VbGetNvStorage(VBNV_RECOVERY_SUBCODE); + } else if (!strcasecmp(name,"wipeout_request")) { + value = VbGetNvStorage(VBNV_FW_REQ_WIPEOUT); } /* Other parameters */ else if (!strcasecmp(name,"cros_debug")) { |