> the only option seems to be to properly install grub
> to the first HD.
grub-install /dev/hda renders the PC completely
unusable
>
> I would start with a grub floppy disk or boot
> CD(-RW) and look what
Both drives are bootable provided I make a detour to
the BIOS and change the boot order.
> devices that sees when booting. In order to have
> grub list disks, you
dmesg reports ALL drives and appropriate partitions.
> enter "root (" and press TAB. The same goes for
> partitions after the
> setting device and a comma (e.g. "(hd0," + TAB).
>
Now this is really wierd. When I'm at the prompt using
the grub that appears when the PC boots, ie when the
second drive is given preference in BIOS, tab
completion reports only a string of fdn's followed by
hd0. But, when having booted and logged in, I issue
the grub command, tab completion reports possible
disks as hd0 and hd1 as it should. And it correctly
sees the "unknown" partition on /dev/hda and the four
linux partitions on /dev/hdc. But that's with
device.map like so: (fd0) /dev/fd0
(hd0) /dev/hda
(hd2) /dev/hdc
^!?!?
> If all devices are seen, then set root (as indicated
> above) to the
> partition holding the grub stages (i.e. partition of
> /boot in Gentoo
> or /lib/grub/i386-pc/). Then have grub write the MBR
> using
> "setup (hd0)". Note that this will overwrite the
> Windows MBR, which
> will make it unbootable at that point. So better
OK, this throws me. Isn't it supposed to be bootable?
As I said above installing grub to Win-mbr renders the
PC unusable. Can't recall the precise error message
but
even the grub prompt isn't available.
> before doing that --
> from Linux -- backup the MBR:
> "dd if=/dev/hda of=/backup-mbr-hda bs=512 count=1"
> so you can write it
> back later.
Thanks for the tip, a lot simpler than booting into
Win98 and running A:\fdisk /mbr.
There's more...
I followed the instructions here:
http://gentoo-wiki.com/HOWTO_Dual_Boot_from_Windows_Bootloader_(NTLDR)_and_why
And, provided I'm booting from /dev/hda, I'm presented
with two choices, Gentoo and XP. XP boots OK but
gentoo halts at:
GRUB Loading stage1.5
GRUB loading, please wait...
Error 21
even though the boot routine is identical to the one
that WORKS when the second drive is given boot
preference.
-mw
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