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