How to switch iMX8M Plus partition

Y_K — Mon, 24 Apr 2023 12:04:15 GMT

Dear NXP Tech support,

We are trying to use eMMC of iMX8M Plus to build partitions for firmware updates.
We are trying to switch partitions as one of the pre-examination.
Trying to modify u-boot to switch between partitions A), B) and partitions C), D).
I tried to set u-boot to switch between partitions A), B) and partitions C), D) but it doesn't work.
Partitions A) and B) always boot.
Are we creating partitions wrong?
Or u-boot configuration is wrong?

I am currently creating partitions with the following contents.
device boot start end sectors type
A) /dev/mmcblk2p1 16384 186775 170392 W95FAT32 (LBA)
B) /dev/mmcblk2p2 196608 17027413 16830806 Linux
C) /dev/mmcblk2p3 * 17027413 17214188 170392 W95FAT32 (LBA)
D) /dev/mmcblk2p4 17224021 34054826 16830806 Linux

After creating partitions with the fdisk command, I copied the files in partitions A) and B) to partitions C) and D).
Partitions A) and C) have kernel images and DTBs.
Partitions B) and D) have rootfs.

The place where u-boot setting was changed is the following item.
mmcpart=3
mmcroot=/dev/mmcvlk2p4 rootwait rw
devplist=3,1

On another note, I read that iMX8M Plus has a Secondary Image Boot feature.
Is it possible to switch partitions by switching BOOT_PARTITION_ENABLE field in the Ext_CSD[179]?

i.MX Processors中的主题 How to switch iMX8M Plus partition

How to switch iMX8M Plus partition