Yocto Harpoon demo on eMMC

[khang_letruong]

Hi Forum, CC @JosephAtNXP,

Recently, I was able to run the Harpoon demo on the iMX8MP-EVK as well as an iMX8MN based custom board. Both require that the yocto harpoon image to be flashed to and executed from the micro-SD card.

I would like to have you advice on what should be done/modified in order to run the harpoon demo on the eMMC, please ?

Thanks in advance,

Khang

[JosephAtNXP]

Hi,

Thank you for your interest in NXP Semiconductor products,

You would need to flash the image (the one you copy using dd CLI command) to eMMC, you can do it using UUU, download latest release and decompress the image until you have a .wic image (instead of .wic.zst).

$ sudo uuu -b emmc_all <image>.wic
> uuu -b emmc_all <image>.wic

Regards

[khang_letruong]

Hi @JosephAtNXP ,

I know perfectly how to flash to and boot from the eMMC. Also, you might have noticed that I tested with both iMX8MP-EVK and our custom iMX8MN-based board. They work very well with normal Linux (without jailhouse mode).

I found the following discussion about Harpoon and eMMC confirming the limitation.

Regards,

K.

[JosephAtNXP · Accepted solution]

Hi @khang_letruong,

You are right, usdhc3 interface is disabled in 8MP and 8MN, you could patch NXP BSP (the linked files) but the added layer would be in lower layers than Harpoon.

The best option is to act upon Harpoon layer, either in the patch that includes such DTS from NXP BSP or create another patch as this one enabling usdhc3. You could quickly confirm enabling the node in that patch and rebuilding.

Keep in mind that you cannot do that on EVK, but on your custom board.

Regards

[khang_letruong]

Hi @JosephAtNXP ,

Your suggestion was really useful. I am now able to get the demo working on the eMMC.

Thanks and best regards,

Khang.