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    • Pat Kusbel's avatar
      fastboot: support for block write and boot partition access · 5e750212
      Pat Kusbel authored
      
      flash now supports writing by block numbers instead of partition names.
      The following command writes an image to block 0x42
      $ fastboot flash 0x42 u-boot.img
      
      emmc boot partition can be unlocked for access via standard fastboot
      
      fastboot flashing unlock_critical
      fastboot flashing lock_critical
      
      See eMMC spec for details of boot_partition_enable, CSD register byte 179
      
      to program a bootloader, such as fastboot
      $ fastboot flashing unlock_critical
      $ fastboot flash 0x42 u-boot.img
      $ fastboot flashing lock_critical
      
      This also supports raw writes to environment configuration.  To
      invalidate the saved uboot environment (and effectively reset it to default)
      
      dd if=/dev/zero of=zero.bin bs=512 count=1
      $ fastboot flashing unlock_critical
      $ fastboot flash 0x1ff0 zero.bin
      $ fastboot flashing lock_critical
      
      Signed-off-by: default avatarPat Kusbel <pat@kusbel.com>
      5e750212
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