dual booting fc6, f8

[Mikkel L. Ellertson]

Gene Heskett wrote:
> Greetings;
> 
> In attempting to come up with a grub.conf which will boot either version of 
> the os, I kept running into not being able to boot f8 from anything but a 
> fedora kernel.
> 
> I have successfully switched the kernel.org 2.6.24-rc6 kernel such that all 
> hard drives are now /dev/sd*.
> 
> But I figured that would probably need an edit of /boot/grub/device.map, but 
> before I did that, I thought I'd run 'grub-install --recheck /dev/sda' sda 
> being the new name for the ide0,0 drive, the old /dev/hda.
> 
>>From my read of the info page, I assumed it would not write anything, but just 
> check what was there for errors.  But it did 
> rewrite /dev/hda1/grub/device.map, placing fd0 above the older assignments, 
> and appending the new sata drive below as /dev/sdc, and replaced a now 
> missing FC2 install on what was /dev/hdb with the /amandatapes drive which 
> was formerly /dev/hdd.  There is currently no drive on the middle connector 
> of the first ide cable.
> 
> Confusing ain't it?
> 
> So, thinking that I needed to re-edit my grub.conf to set the f8 drive as 
> 'root (hd2,0)', I did so.  But now none of the f8 boot stanzas work, error 15, 
> file not found.
> 
Unless you have 3 hard drives that the BIOS sees, this should still
be 'root (hd1,0)'. This tells Grub to use the second BIOS drive,
first partition.

> So I guess I don't understand how grub works as well as I thought.  The info 
> pages might tell me, but it seems the only way to read them is backwards as 
> once you've gone down a tree to read something, there seems to be only one 
> way to back up, using the backspace key, but you never get back to the main 
> menu so its easier to 'q'uit it and restart it, but that screws with ones 
> train of thought till not even 2 more cups of coffee makes it make sense.
> 
Try using pinfo, and the arrow keys.

> The other ugly thought is that my bios doesn't see the sata drive (sdc) at 
> all, and the couple of times I made it boot to f8, I had to move all the boot 
> files to /dev/hda1, but specify /dev/VolGroup01/LogVol00 in the kernel 
> argument line, but that seems to have quit working too.
> 
The thing to keep in mind is that Grub uses the BIOS for all its
drive access. So if the BIOS can not access a drive, then Grub can
not access it. The Linux designation of a drive does not matter to
Grub. Only the BIOS designation matters.

Mikkel
-- 

  Do not meddle in the affairs of dragons,
for thou art crunchy and taste good with Ketchup!

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