[Mactel-linux-users] trouble with refit/grub usb boot

[Ken M. <km...@ma...>]

I've had my Intel Mac Mini booting using grub off of a usb drive 
selected from refit for some time. I did this without any alteration of 
the internal OS X disk.

I wanted to upgrade to a larger usb disk and have dd'd a duplicate onto 
a larger usb disk. I used grub to setup the new usb disk bootloader with

root (hd0,0)
setup (hd0)

from grub. grub shows hd0 as the only hard drive, and confirms that 
(hd0,0) is the proper ext2 filesystem.

When I go to boot through refit and select the new usb drive, it never 
gets as far as a grub message. I get a "no bootable device insert boot 
disk and press any key".

There is nothing wrong with /boot on the first partition of the new usb 
disk. I can get refit to boot off a cdrom and use grub from there to 
boot the new usb drive.

I really can't remember what I did differently to get this to work with 
the old usb drive.

Ideas?