OK, I did 3 different installs onto another USB flash drive.
- UEFI mode, after wiping 1MB at the beginning and the end of the drive (to erase any secondary GPT)
sysinst to use the standard partition sizes. In the screen which it presented, I reduced the size of the
msdos (UEFI ESP) and
swap partitions (4MB and 50MB resp.--the flash drive is only 500MB). Chose a
minimal install, and everything went fine. Could boot directly from the USB flash drive.
- UEFI mode. told
sysinst to use the existing GPT partitions.
Made sure to do a newfs (as indicated by the
N flag) for both the
This too worked just fine.
- CSM (BIOS) mode (verified using
machdep.bootmethod) after wiping drive.
sysinst naturally wanted to create an
MBR here. I told it I wanted GPT. This time it only created 2 partitions instead of 3:
swap. Didn't let me add an
msdos partition; and I told it to skip installing any rubbish
bootblocks(why? I told you I wanted GPT...)
As expected, with no ESP containing the UEFI bootloader files, and no MBR bootblocks either, the drive didn't boot. But, this is GPT, so it's easy to fix: Deleted
swap, made it smaller, squeezed in a small 4MB UEFI ESP partition, formatted it, copied the
/usr/mdec/boot*.efi files into
/efi/boot/. and hey presto! now it's a bootable drive.
So, my question is: what does
print on this system of yours?