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If UMA is locked, read and write access to SR* regs will fail, and we'll be unable to determine or change our write protect state. Save our SR regs before enabling UMA lock, and bring down UMA lock for a brief period when writing SR regs. BUG=chrome-os-partner:60029 BRANCH=gru TEST=Manual on kevin with SW sync enabled. flashrom -p ec --wp-enable -> verify success, check flags: Flags: wp_gpio_asserted ro_at_boot ro_now Reboot host, check flags: Flags: wp_gpio_asserted ro_at_boot ro_now all_now Verify flashrom -p ec --wp-status shows protected, and flashrom -p ec --wp-disable fails. Also verify same state after EC reset. Boot into recovery mode, check flags: Flags: wp_gpio_asserted ro_at_boot ro_now Remove WP screw, reboot EC, check flags: Flags: ro_at_boot ro_now Verify flashrom WP status shows protected, and flashrom WP disable succeeds and clears all flags. Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Change-Id: I17e32f7305600183e7fcb87f69a3feb88978f94e Reviewed-on: https://chromium-review.googlesource.com/412977 (cherry picked from commit 6cfc0d0dd030b8b0334f99e99950a52fcf8267af) Reviewed-on: https://chromium-review.googlesource.com/415497 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-by: Shawn N <shawnn@chromium.org>