* mmc-utils boot enable conflict with mmc_blk_part_switch
@ 2014-08-14 9:11 Matthieu CASTET
0 siblings, 0 replies; only message in thread
From: Matthieu CASTET @ 2014-08-14 9:11 UTC (permalink / raw)
To: linux-mmc@vger.kernel.org; +Cc: Chris Ball, Ulf Hansson
Hi,
Boot enable setting is enable with writting PARTITION_CONFIG ext csd.
But the kernel also write it in mmc_blk_part_switch.
This lead to weird result :
~ # mmc_utils extcsd read /dev/mmcblk0 | grep PARTITION_CONFIG
Boot configuration bytes [PARTITION_CONFIG: 0x00]
## no boot partition enabled
~ # mmc_utils boot enable 1 1 /dev/mmcblk0
~ # mmc_utils extcsd read /dev/mmcblk0 | grep PARTITION_CONFIG
Boot configuration bytes [PARTITION_CONFIG: 0x48]
## boot partition enabled
~ # dd if=/dev/mmcblk0boot0 of=/dev/null count=1
1+0 records in
1+0 records out
~ # mmc_utils extcsd read /dev/mmcblk0 | grep PARTITION_CONFIG
Boot configuration bytes [PARTITION_CONFIG: 0x01]
## kernel erased your boot partition config.
This is because the kernel have a cache of ext_csd in card->ext_csd and
is not aware of modification done by the mmc_utils.
Matthieu
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