Orin Nano: Can't change/ select UEFI boot device

Autonomous Machines Jetson & Embedded Systems Jetson Orin Nano
9
  1. With NVMe boot:
L4TLauncher: Attempting Direct Boot
L4T boot options
0: NVME primary kernel
1: primary kernel
  1. With USB boot:
L4TLauncher: Attempting Direct Boot
L4T boot options
0: USB kernel
1: primary kernel
  1. Change boot sequence: success

But like I say, both boot option mount NVMe for rootfs.

ubuntu@tegra-ubuntu:~$ lsblk
NAME         MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
loop0          7:0    0    16M  1 loop 
sda            8:0    1  59.5G  0 disk 
├─sda1         8:1    1    55G  0 part /media/ubuntu/7d793bf7-affe-43a3-9399-683
├─sda2         8:2    1    64M  0 part 
├─sda3         8:3    1   448K  0 part 
├─sda4         8:4    1    32M  0 part 
├─sda5         8:5    1    64M  0 part 
├─sda6         8:6    1   448K  0 part 
├─sda7         8:7    1    32M  0 part 
├─sda8         8:8    1    80M  0 part 
├─sda9         8:9    1   512K  0 part 
├─sda10        8:10   1   300M  0 part 
├─sda11        8:11   1    64M  0 part 
├─sda12        8:12   1    80M  0 part 
├─sda13        8:13   1   512K  0 part 
└─sda14        8:14   1    64M  0 part 
zram0        251:0    0 275.9M  0 disk [SWAP]
zram1        251:1    0 275.9M  0 disk [SWAP]
zram2        251:2    0 275.9M  0 disk [SWAP]
zram3        251:3    0 275.9M  0 disk [SWAP]
zram4        251:4    0 275.9M  0 disk [SWAP]
zram5        251:5    0 275.9M  0 disk [SWAP]
nvme0n1      259:0    0 119.2G  0 disk 
├─nvme0n1p1  259:1    0 118.5G  0 part /
├─nvme0n1p2  259:2    0    64M  0 part 
├─nvme0n1p3  259:3    0   448K  0 part 
├─nvme0n1p4  259:4    0    32M  0 part 
├─nvme0n1p5  259:5    0    64M  0 part 
├─nvme0n1p6  259:6    0   448K  0 part 
├─nvme0n1p7  259:7    0    32M  0 part 
├─nvme0n1p8  259:8    0    80M  0 part 
├─nvme0n1p9  259:9    0   512K  0 part 
├─nvme0n1p10 259:10   0   300M  0 part 
├─nvme0n1p11 259:11   0    64M  0 part 
├─nvme0n1p12 259:12   0    80M  0 part 
├─nvme0n1p13 259:13   0   512K  0 part 
└─nvme0n1p14 259:14   0    64M  0 part

=> Yes, when I modify something that would potentially corrupt the rootfs.
(can’t reach the Login Prompt or keep rebooting.)

I have no choice but re-flash all APP partition, or remove NVMe to use different rootfs.
Both take a lot of time.

I found the way to modify the rootfs target /boot/extlinux/extlinux.conf.

- root=PARTUUID=ad43ec6f-6d79-4df0-b915-1c936b0e33ef
+ root=/dev/sda1

And could change it in demo image by modify flash.sh

elif [ "${target_rootdev}" == "internal" ] || \
     [ "${target_rootdev}" == "external" ] || \
     [[ "${rootfs_ab}" == 1 ]]; then
        # For 'internal' and 'external' target root devices,
        # or enabled ROOTFS_AB=1, always use the UUID stored in the file
        # ${rootfsuuidfile} or ${rootfsuuidfile}_b if present.
        # If this file is not present, then try to generate one.
        _tmp_uuid="";

        if [ "${target_rootdev}" == "external" ] || \
        [ "${external_device}" -eq 1 ]; then
                rootuuid_restore "_ext"
                _tmp_uuid="${rootfsuuid_ext}";
        else
                rootuuid_restore ""
                _tmp_uuid="${rootfsuuid}";
        fi

        if [ ${disk_enc_enable} -eq 1 ]; then
                # The encrypted fs UUID of the rootdev.
                if [ "${external_device}" -eq 1 ]; then
                        rootuuid_restore "_ext_enc"
                        _tmp_uuid="${rootfsuuid_ext_enc}";

                        bootpartuuid_restore "_ext"
                        rootfsuuid_enc="${rootfsuuid_ext_enc}"
                        rootfsuuid_b_enc="${rootfsuuid_b_ext_enc}"
                        # These variables are set in disk_encryption_helper.func
                        bootpartuuid="${bootpartuuid_ext}"
                        # These variables are set in disk_encryption_helper.func
                        bootpartuuid_b="${bootpartuuid_b_ext}"
                else
                        rootuuid_restore "_enc";
                        _tmp_uuid="${rootfsuuid_enc}";

                        bootpartuuid_restore;
                fi

                cmdline+="root=UUID=${_tmp_uuid} rw rootwait rootfstype=ext4 "
        else
                cmdline+="root=PARTUUID=${_tmp_uuid} rw rootwait rootfstype=ext4 "
        fi;
else
        cmdline+="root=/dev/${target_rootdev} rw rootwait rootfstype=ext4 "
fi;
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