diff options
| -rw-r--r-- | util/flash_fp_mcu | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/util/flash_fp_mcu b/util/flash_fp_mcu index aff479dba9..bfaa391fc0 100644 --- a/util/flash_fp_mcu +++ b/util/flash_fp_mcu @@ -472,6 +472,18 @@ flash_fp_mcu_stm32() { klog "Binding cros-ec driver" echo "" > "/sys/bus/spi/devices/${deviceid}/driver_override" echo "${deviceid}" > /sys/bus/spi/drivers/cros-ec-spi/bind + else + # FPMCU can still have ro_now protection (sector write protection) enabled + # e.g. when flash_fp_mcu was run with --read option. It is disabled when + # FPMCU boots with HW write protect disabled. + # Disabling sector write protection takes some time due to flash internal + # structures update. During that time we can't reset or power cycle FPMCU + # otherwise we will corrupt internal flash state which will brick FPMCU. + # This situation can occur if DUT is rebooted immediately after flash_fp_mcu + # finishes, so give some time to remove sector write protection. No need to + # wait if transport is SPI because later we query for version and reset + # flags. + sleep 3 fi if [[ "${cmd_exit_status}" -ne 0 ]]; then |