>On Tue, 11 Mar 2014 20:08:45 +0100
>Alexey Orishko <[email protected]> wrote:

> I can't boot BLFS 7.4 system (Intel Atom 32-bit) from USB stick on
> some motherboards, but I  can do it on the same motherboard type with
> different (old) BIOS version.

> I've read BIOS release notes and found nothing relevant to the problem
> neither seen anything significantly different in BIOS menu.

> - If I connect the same USB stick to the motherboard with old BIOS,
> it boots ok.
> - I can boot from SATA HDD with exactly the same root fs as USB stick
> (I've copied root partition with cpio and updated UUID value in grub
> and fstab).
> - I can boot from USB stick only if it has FAT32, for example MSDOS
> boot disk or Ubuntu install disk made by Universal-USB-Installer.exe.
> 
> I wonder, what else do I need to check in order to get to the bottom
> of this problem?

Returning back to the root of the problem, can you give a bit more
light?

If you have an USB with ext2 (or whatever), you can not boot a new
BIOS, correct? If you have an USB with FAT32, and with the exact same
filesystem (except ownership and permissions) that the USB with ext2
has, you can boot it?

The question being, can you make a USB bootable just by switching the
filesystem?

And a thing I just came up with: does your ext2 USB have the "bootable"
flag set on its boot partition?

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