i.MX audio board cannot find MMC device when to boot from micro SD card

[michael_wang1]

I am trying to boot linux from micro-SD card in i.MX audio board with IMX8MNano as SOM. In Nano development board, it can boot linux from SD card. However, in the audio board, though it can load u-boot from SD card, u-boot failed to load linux with following error messages:

MMC: no card present
flash target is MMC:1
MMC: no card present
MMC card init failed!
MMC: no card present
** Block device MMC 1 not supported
Net:
Warning: ethernet@30be0000 using MAC address from ROM
eth0: ethernet@30be0000
Fastboot: Normal
Normal Boot
Hit any key to stop autoboot: 0
MMC: no card present
MMC Device 0 not found
no mmc device at slot 0

[michael_wang1]

hi Igor,

thanks for your kind reply.

I can boot from sd-card in the nano development board. 

I'm now planning to test audio in the audio dev kit. The nano SOM is installed as the interposer board.

It can load u-boot when to boot from sd-card in the audio board, but u-boot failed to detect sd-card.

Do I need another device tree to run nano in the audio board?

best,

Michael

[igorpadykov]

Hi Michael

one can look at

i.MX Audio Board Hardware User's Guide

Best regards
igor

[igorpadykov]

Hi Michael

reason may be wrong root=/dev/mmcblkXpY parameter described in

Table 11. Common kernel boot parameters i.MX Linux Release Notes

and i.MX Linux User’s Guide​

In audio board there is no emmc, one can try to boot without audio board.

Use Demo Image from link

https://www.nxp.com/design/software/embedded-software/i-mx-software/embedded-linux-for-i-mx-applicat...

Best regards
igor