Hi,
Sorry that you still don’t get the point. “On board” just means the carrier. There are no other terms. “ConnectTech Photon” is the carrier.
We only have 2 components here. A Xavier NX module and a carrier, or you call it board, which has no difference.
There are two kinds of “modules”, one has sdcard slot on the “module”. That is why we provide “sdcard image”. Such image is for this kind of module.
The other kind of module has no sdcard slot, and it only has emmc.
The link and the picture you posted mean this is ConnectTech’s custom carrier board. There is a sdcard slot on this “carrier board”. This is added by ConnectTech because they want to support sdcard. You can know that this kind of carrier board is mostly for emmc module and sdcard image does not support such sd slot.
Also, flash.sh is not able to flash any “external storage”.
And uboot does not care about what parameters you give to flash.sh.
I assume just: ./flash.sh [board] /dev/mmcblk1p1 <---- THAT SHOULD TELL uBoot to always look for the sdcard firs
This command only tells the kernel cmdline, “mount the file system from /dev/mmcblk1p1”. Which means it is for kernel to read. Not uboot.
You can read my post here to understand.
If you really want to check what is going on, share the uart log from your board.