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I'm trying to setup a dualboot with Gentoo Linux and Windows 7.

Heres my partitions:

/dev/sda1 /boot partition, ext2
/dev/sda2 Windows 7 partition, ntfs
/dev/sda3 swap partition, Linux swap
/dev/sda4 root partition, btrfs

Using Grub, I can boot into Gentoo, but when I'm choosing to boot Windows 7, nothing happens. It just writes the Grub options for that choice, and then it hangs.

grub.conf:

default 0
timeout 30

title Gentoo
root (hd0,0)
kernel /boot/kernel-x86_64-2.6.31 root=/dev/sda4

title Windows
rootnoverify (hd0,1)
makeactive
chainloader +1

Any ideas? Help will be much appreciated!

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2 Answers 2

Update your GRUB,I've had that problem with my Archlinux/Windows 7 setup,but when I installed the latest version of Ubuntu,it booted both systems seamlessly

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I tried updating to Grub 1.97 (a masked package on Gentoo) and I can't get it working. After upgrading, I have no "grub" command, only grub-install and some other. Running grub-install works, but after reboot, I get the grub shell, not the grub menu. –  Tommy Jakobsen Nov 8 '09 at 19:00
    
the grub version in ubuntu is a beta version,try looking for it on grub's website –  Mahmoud Hossam Nov 9 '09 at 1:13

I'm attempting to do the same thing (dual boot Windows 7 and Gentoo) and I am having similar problems. My GRUB bootloader looks practically identical to yours (except for a splash image) When I try to load Windows, I get the "BOOTMGR is missing" error. I'm still messing around with a few ideas on how to make these two operating systems work together, since I'm found next to nothing with Google searches. I saw this post, and found it relatively useful, so I had to comment. I wouldn't call myself a Windows expert, nor a Linux guru, but I've got the general idea of what I need to do, and what's going on.

If you guys have any ideas or comments, please feel free to provide constructive criticism!

(I'll try to update this when I find anything new or interesting in this crazyness)

EDIT: Okay, I did a bit of poking around (remember, I'm not really a guru...) The kind of setup that I had was:

/dev/sda1 = Linux boot partition
/dev/sda2 = Windows 7 partition
/dev/sda3 = Linux swap partition
/dev/sda4 = Linux root partition

When the "BOOTMGR not found" error came up, I decided to reinstall Windows 7, but specifically on the /dev/sda2 partition. (note: When I made a fresh install of Windows 7, leaving a lot of the hard drive unformatted for Gentoo, Windows 7 made two partitions, one for boot, and one for the 100 GBs that I assigned to it) Of course, installing Windows made it ignore GRUB, so I used the Gentoo minimal install CD to rewrite GRUB to /dev/sda. the fdisk command says that the Windows partition is bootable (marked with a * in the table) and /dev/sda1 is not. GRUB still loads, though, and choosing Windows 7 from GRUB successfully loads Windows 7, so I'm not complaining. Being somewhat of a newb, though, I am unclear as to why this is, and what /dev/sda1 is up to...

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