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e8ecda5e8d
This adds support for write protecting the RO code at boot, and the entire flash on demand. Implementation if WP# is not asserted is currently a little different than STM32F and LM4; RO is still protected at boot if ro_at_boot, but can be unprotected and the change will commit on the next reboot. This saves the bank of flash which we use for pstate on LM4 and STM32F. I think I can use one of the unused option bits (WRP2 bit 0) to hold the RO-at-boot flag, in which case I can more closely match the behavior of the other chips, but I'd like to do that (or give up and implement pstate) in a separate CL so it's clearer what I'm doing. BUG=chrome-os-partner:15613 BRANCH=none TEST=manual - flashinfo -> (no flags) - enable WP (via screw or dut-control) - flashinfo -> wp_gpio_asserted - flashwp enable - flashinfo -> wp_gpio_asserted ro_at_boot - flashwp now - flashinfo -> wp_gpio_asserted ro_at_boot all_now - flashwp disable -> fails - flashinfo -> wp_gpio_asserted ro_at_boot all_now - flasherase 0x1fc00 0x400 -> fails - reboot - flashinfo -> wp_gpio_asserted ro_at_boot ro_now - flasherase 0xfc00 0x400 -> fails - flasherase 0x1fc00 0x400 -> succeeds - disable WP (via screw or dut-control) - reboot - flashinfo -> ro_at_boot ro_now - flashwp disable - flashinfo -> ro_now - reboot - flashinfo -> (no flags) - flasherase 0xfc00 0x400 -> succeeds - flasherase 0x1fc00 0x400 -> succeeds Change-Id: Id1b6b099a44a1985a5ab9387feb882a8f26e3aa1 Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/55594