Other Parts Discussed in Thread: CSD
Hi All,
I'm using BBB and successfully partitioned e-MMC General user area into 6 partitions by using SFDISK <sfdisk -D -H 255 -S 63 -C $CYLINDERS $DRIVE> Linux utility
mmcblk0p1 ---> Boot Partition of size 8MB <MLO and u-boot.img>
mmcblk0p2 ---> Ext4 Partition of size 256MB
mmcblk0p3 ---> Ext4 Partition of size 256MB
mmcblk0p4 ---> Extended Partition
-mmcblk0p5 ---> Ext4 Partition of size 256MB
-mmcblk0p6 ---> Ext4 Partition of size 256MB
-mmcblk0p7 ---> Ext4 Partition of size 256MB
The partitions created and able to access, but the issue is HOW TO WRITE PROTECT individual partitions ? i have to protect 3 partitions from writing not entire e-MMC.
I have tried to protect by using mmc-utility
Print extcsd data from <Device>
mmc extcsd read /dev/mmcblk0p1
ioctl: Operation not permitted
Could not read EXT_CSD from /dev/mmcblk0p1
mmc extcsd read /dev/mmcblk0p2
ioctl: Operation not permitted
Could not read EXT_CSD from /dev/mmcblk0p2
Determine the eMMC writeprotect status of <device>.
mmc writeprotect get /dev/mmcblk0p1
ioctl: Operation not permitted
Could not read EXT_CSD from /dev/mmcblk0p1
mmc writeprotect get /dev/mmcblk0p2
ioctl: Operation not permitted
Could not read EXT_CSD from /dev/mmcblk0p2
Set the eMMC writeprotect status of <device>.
mmc writeprotect set /dev/mmcblk0p1
ioctl: Operation not permitted
Could not read EXT_CSD from /dev/mmcblk0p1
mmc writeprotect set /dev/mmcblk0p2
ioctl: Operation not permitted
Could not read EXT_CSD from /dev/mmcblk0p2
Is there any way to write protect or lock the individual e-MMC partition to safe guard from unwanted write and erase?
Any suggestions highly appreciable
Thanks
Thiru N
