On Wed, Jan 27, 2021 at 11:41 PM Brian Hutchinson via lists.yoctoproject.org <b.hutchman=gmail.com@lists.yoctoproject.org> wrote:

Ok, stumped now. I created a /etc/fw_env.config file with:
/dev/mmcblk1 0x400000 0x1000

Also tried:
/dev/mmcblk1 0x0 0x1000

... mmcblk1 is the sdcard I'm booting.

Now I'm getting:

root@imx8mmevk:/etc# fw_printenv
Cannot read environment, using default
Cannot read default environment from file

This is first time I'm using sdcards or eMMC to store u-boot env, always did it in NOR before so I'm kinda lost at the moment.

Anyone know where the u-boot env is on sdcard (or eMMC)?

Update ... feeling like I'm losing my mind now.

fw_env.config must be sensitive to spaces or tabs or something.

I messed around with it some more and it magically started working with my imx8mm-evk board with fw_env.config containing:

/dev/mmcblk1 0x400000 0x1000

I don't know why that didn't work before ... I tried all kinds of things to get this to work and really can't explain why it just started working. To test, I used fw_setenv to set a variable and rebooted and stopped in u-boot and did printenv and sure enough the variable I set is there.

Regards,

Brian