Writing mmcblk0boot0 partition from linux command line

dougbailey — Tue, 10 Nov 2015 22:52:07 GMT

I am trying to update the u-boot on my iMX6 board without having to open the packaging. I have access to unit via network and the android adb tool so I can get console access and can stage the u-boot binary in the mounted MMC partition.

I see that the u-boot is programmed into the /dev/block/mmcblk0boot0 and /dev/block/mmcblk0boot1 block devices. However, when I try to dd the new image to those partitions I get the following response:

# dd if=/sdcard/uboot.bin of=/dev/block/mmcblk0boot0 seek=1024

/dev/block/mmcblk0boot0: write error: Operation not permitted

1+0 records in

0+0 records out

I tried opening up the permissions on the /dev/block/mmcblk0boot0 device with no luck.

Is this even possible? Do I need to change something in how the kernel image is built or how it is initially programmed?

Regards,

Doug Bailey

Re: Writing mmcblk0boot0 partition from linux command line

dougbailey — Wed, 11 Nov 2015 22:31:12 GMT

It appears that the answer would be in the linux documentation.

https://www.kernel.org/doc/Documentation/mmc/mmc-dev-parts.txt

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Writing mmcblk0boot0 partition from linux command line

Re: Writing mmcblk0boot0 partition from linux command line