Vic Yang a7d7297577 stm32f: Use FLASH_KEYR to lock entire flash ...

Writing wrong key to FLASH_KEYR locks entire flash and effectively
performs RW_NOW. Therefore we can use this and remove RW_AT_BOOT to
prevent having to reboot for RW to be protected.

BUG=chrome-os-partner:12043
TEST=1. fakewp 1         -> wp_gpio_asserted
     2. flashwp now      -> nothing happens
     2. flashwp enable   -> wp_gpio_asserted ro_at_boot
     3. reboot           -> wp_gpio_asserted ro_at_boot ro_now
     4. flasherase 0x10000 0x1000 -> success
     5. flashwp now      -> wp_gpio_asserted ro_at_boot ro_now rw_now
     6. flasherase 0x10000 0x1000 -> error
     7. reboot           -> wp_gpio_asserted ro_at_boot ro_now
     8. flasherase 0x10000 0x1000 -> success

Change-Id: I22df188e31404c190c5830c6d94c9646224eb9ab
Reviewed-on: https://gerrit.chromium.org/gerrit/29255
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Commit-Ready: Vic Yang <victoryang@chromium.org>
Tested-by: Vic Yang <victoryang@chromium.org>

2012-08-08 11:39:48 -07:00

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