I’m trying to update manually using the UEFI capsule update mechanism, which requires setting this UEFI variable: OsIndications. (This is assuming we’ve been able to set TegraPlatformSpec, and TegraPlatformCompatSpec previously)
On the Xavier AGX, which has the uefi variable store on the emmc, we have to write files to a location on the ESP, under /EFI/NVDA/Variables, and reboot.
However, if the ESP is on an NVMe drive, instead of the emmc, this will fail, with this message produced (when turning on debug messages):
Failed to Locate System Partition Guid Not Found
I suspect the cause of the issue is that NvmExpressDxe and others required to read from an nvme drive are not loaded when DefaultVariableDxe runs, while the emmc/sd card dxes are loaded by virtue of being in APRIORI DXE under Platform/NVIDIA/Jetson/Jetson.fdf