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Re: grub-pc still too obtuse

From: Arthur Marsh
Subject: Re: grub-pc still too obtuse
Date: Mon, 09 Mar 2009 07:30:36 +1030
User-agent: Mozilla-Thunderbird (X11/20090103)

Hi, I didn't see your reply in the mailing list, so I've had to quote it manually:

Felix Zielcke wrote, on 09/03/09 06:29:
> Am Montag, den 09.03.2009, 06:03 +1030 schrieb Arthur Marsh:
>> I just installed grub 1.96+20090307-1 on Debian unstable and managed to get:
>> grub-setup "(hd0)"
>> to run, but the fact that one needs to run grub-setup in that way in
>> order to install the latest version of grub on the boot media still
>> isn't documented, and I can't figure out how to run grub-probe based on
>> the current manual page and documentation.
> Don't run grub-setup, but the grub-install like, either with
> `grub-install /dev/hda' or `grub-install "(hd0)"', because only
> grub-install will update all modules in /boot/grub.
> If you just run grub-setup then grub2 isn't really updated.

Thanks, that worked.

> And what's your problem with grub-probe?
> You run it like `grub-probe /path' or `grub-probe -d /dev/hda1'.

The problem went away after running grub-install

>> I would like to have a grub menu entry to attempt booting off the USB
>> drive as this machine is too old to support booting directly off USB.
> You can try the usbms module to support booting from an USB device.
> insmod uhci (or ohci, depends on your USB controller)
> insmod usbms
> and maybe `ls' shows a new device for your USB drive.

usb_storage is loaded, but even with the USB drive listed in /boot/grub/device.map (as (hd2)):

(hd0)   /dev/hda
(hd1)   /dev/disk/by-id/scsi-SIBM_DCAS-34330W_F3T92021
(hd2)   /dev/disk/by-id/usb-Verbatim_STORE_N_GO_078A18B40293-0:0

and the drive has a boot record on it:

dd if=/usr/lib/syslinux/mbr.bin of=/dev/sda

update-grub does not detect anything of interest on hd2.

>> I have also not been successful on booting from /dev/sdb1 (Win95) unless
>> I change the BIOS to boot from SCSI, and even to do that, I had to mark
>> the FAT partitions on /dev/hda "hidden".
> grub2 doestn't have a map command yet which is needed to boot old
> windows/dos systems from a drive different then hd0.

Ah, ok, thanks for the information.



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