iMX8MM EVK Linux boot fails with demo image out of the box

[davidvescovi]

Brand new i.MX 8M Mini DDR4 EVK out of the box.

Android SD card boots fine.

Downloaded L5.4.47-2.2.0_images_MX8MMEVK.zip and extracted.

Burned imx-image-full-imx8mmevk.wic to SD card and booted.

...

[ 968.744636] healthd: battery l=85 v=3 t=35.0 h=2 st=2 c=400 fc=4000000 cc=32 chg=a
[ 1024
U-Boot SPL 2020.04-5.4.47-2.2.0+gffc3fbe7e5 (Sep 11 2020 - 22:00:22 +0000)
power_bd71837_init
DDRINFO: start DRAM init
DDRINFO: DRAM rate 3000MTS
Training FAILED

[davidvescovi]

got it working ... no help from printed documentation.

[jrsalas]

May I know if you found a 'ready' .wic image for the 8MMINID4-EVK (not 8MMINILPD4-EVK)? or did you have to go the hard way for an 'out-of-the-box' demo?
Thanks!

[jrsalas]

Hi, thanks for you reply.

The output I get is:

U-Boot SPL 2020.04-5.4.70-2.3.0+ge42dee801e (Dec 03 2020 - 22:30:26 +0000)
Can't find PMIC:PCA9450
DDRINFO: start DRAM init
DDRINFO: DRAM rate 3000MTS
Training FAILED

About the second line above 'Can't find PMIC:PCA9450'. Looking into schematics for 8MMINID4, U8 (PMIC) is ROHM BD71847MWV not PCA9450 as in 8MMINILPD4. Could this be the reason why I cannot boot the prebuilt wic image on my new EVB? Note that it works with preloaded Android SD.

Thanks again!

[davidvescovi]

My issue was the newer evk boards use the DDR4 memory as opposed to LPDDR4 used on the original evk boards.

The prebuilt demo image was built using LPDDR4 and does not run on DDR4 evks.  (unless NXP has updated it) in my case. Check your evk part numbers.

I had to rebuild image for DDR4 to get it to run on DDR4 based evk.

David

[joanxie]

yes, just now I download wic of 5.4.70 to the imx8mmddr4 evk board successfully, you can use it

[davidvescovi]

maybe you should improve the documentation as the procedure as described in the quick start manual is wrong.

[joanxie]

you can find the specific ddr4 in the dts or uboot image name, if you use ddr4 board, try to choose that

[joanxie]

my understanding is that this image is for imx8mm lpddr4 board, if  you use ddr4 board, try to use the specific uboot for ddr4 board and test again