After my old laptop developed what seems to be NVME controller faults, I installed my backup onto an external SDD. On a borrowed Dell Latitude 5510 that external SDD boots. The SSD is partitioned as
Disk /dev/sdb: 1.82 TiB, 2000365371904 bytes, 3906963617 sectors
Disk model: My Passport 264F
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 1048576 bytes
Disklabel type: gpt
Disk identifier: AAEEB6DD-E581-4EC4-9D54-06665DCB89CF
Device Start End Sectors Size Type
/dev/sdb1 2048 616447 614400 300M EFI System
/dev/sdb2 616448 3839854591 3839238144 1.8T Linux filesystem
/dev/sdb3 3839854592 3906963455 67108864 32G Linux swap
The EFI System partition gets mounted as /boot/efi and there’s GRUB installed onto the SSD to boot.
When I plug the SSD into the Darter coreboot sees the external drive, but when I try to boot from it, it does not find anything to boot… (I do not remember the exact error message). From a USB memory stick that has the Manjaro installation system on it, the machine can also not boot. But it did boot from a USB stick with Ventoy on it, then booting into the Manjaro installation system.
So, my question is, what specific tweak is necessary to boot my external SSD that currently has my working system/installation on it?