Robert Millan wrote:
On Fri, Feb 15, 2008 at 11:32:49PM +0100, Christian Franke wrote:
I don't think it is really practical to support USB drives in
grub-mkrescue.
You'd have to require root permissions, which IMO beats the point of having
a separate script from grub-install in first place.
It may be useful to create small rescue images which can be later put on
USB key with dd.
(BTW: The "floppy" image actually boots from USB at least on one of my
PC. It appears as hd0).
Yes, but how different would those be from floppy output? As you point out,
floppy images work as well.
For a BIOS which handles USB flash drives like USB hard drives, a valid
hard disk boot sector with a partition table should be present.
With the floppy image, GRUB detects bogus partitions on (hd0), because
boot.img contains the "floppy_probe" code in the partition table space.
The boot sector is also not properly patched for hdd (need to replace
jmp by nop at "boot_drive_check").
But it actually works without any change.
Besides, dd'ing a grub image to that stick would render the rest of the device
useless for filesystem data.
Yes. But if you need a rescue boot device when floppy or CD cannot be
used for some reason, you probably do not care about this :-)
It may be possible to produce a rescue image with a valid partition
table such that a filesystem partition can be added later.
Otherwise, grub-setup/install may work to install grub on an USB flash
drive which has partition table and filesystem.
The patch also adds a --joliet option, useful to access the long file
names on Windows (which has no RR support).
Is there any drawback in using --joliet ? If not, I think it's better to do
it by default to avoid "option creep".
I'm not aware of any drawback.
Christian
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