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We may have multiple storage types (disk or mkbp) of VbNvContext. crossystem should switch the type and choose the corresponding device driver. After patching U-Boot, you may check storage type: [ "mkbp" = "$(cat /proc/device-tree/firmware/chromeos/nonvolatile-context-storage)" ] And cross-verify crossystem with mosys: $ mosys nvram vboot read 70000000000000000000000000000020 $ crossystem recovery_request 0 $ crossystem recovery_request=123 $ mosys nvram vboot read 70007b0000000000000000000000005d $ mosys nvram vboot write 70000000000000000000000000000020 $ crossystem recovery_request 0 More importantly, crossystem should also work with older version of firmware, which does not pass down this information. Signed-off-by: Che-Liang Chiou <clchiou@chromium.org> BRANCH=none BUG=chrome-os-partner:13766 TEST=Check storage type on a Snow device: [ "mkbp" = "$(cat /proc/device-tree/firmware/chromeos/nonvolatile-context-storage)" ] Make sure that FAFT is still happy: ./run_remote_tests.sh --remote $ADDR --board daisy 'firmware_TryFwB/control$' ./run_remote_tests.sh --remote $ADDR --board daisy 'firmware_TryFwB/control.dev$' More importantly, check crossystem worked well even when ChromeOS is booted from an older version of firmware. Change-Id: I3989a8c181efe03cd9f06127743763e0ad97e281 Reviewed-on: https://gerrit.chromium.org/gerrit/32470 Reviewed-by: Che-Liang Chiou <clchiou@chromium.org> Tested-by: Che-Liang Chiou <clchiou@chromium.org> Commit-Ready: Che-Liang Chiou <clchiou@chromium.org>