EFI booting from external USB pen drive

[Warner Losh]

FAT12 isn't good for UEFI. Use FAT16 or FAT32.

Warner

On Thu, Jul 5, 2018, 9:32 AM Bjoern A. Zeeb <bzeeb-lists at lists.zabbadoz.net>
wrote:

> Hi,
>
> while I can boot memstick images just fine (which are created using
> makefs/mkimg), doing the same thing using gpart/newfs_msdos -F 12/.. I
> am not able to get anything that boots.
>
> On a Thinkpad (secure boot is off) from the “boot device chooser from
> ‘BIOS’” I get a quick blank screen and am back at the chooser.
> I’ve tried the gpart “thinkpad hack” as well as trying an MBR (why
> that should work I don’t know but the memstick one does) and GPT
> options of various kinds.
>
>
> Anyone successfully done this lately?
>
>
> /bz
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