We have a custom board with a sd card connected to SDMMC3. when we enable sdmmc3 (sdhci@700b0400), system goes to panic mode and enter in bash mode.
when we change mmcblk0p1 to mmcblk1p1 in “APPEND ${cbootargs} quiet root=/dev/mmcblk1p1 rw rootwait rootfstype=ext4 console=ttyS0,115200n8 console=tty0 fbcon=map:0 net.ifnames=0” line in /boot/extlinux/extlinux.conf manually, system boots succesfully.
I am using Jetson Nano(model p3448) which has microSD card slot instead
of eMMC for storage and using 32.4.4. L4T.
kernel panic is due to mmc0 as in log([ 16.055631] ERROR: mmcblk0p1 not found) . only if we enable sdhci@700b0400 node, the bootable sd card node is detected as mmcblk1 and its partition[p1-p14] also created as shown in logs. in this case we haven’t connected sd card at sdio(sdmmc3).