Re: grub in mac

[Andrei Borzenkov]

11.11.2015 06:52, Peter Cheung пишет:
> Here you go, thanks again:
> /Users/peter/NetBeansProjects/PeterI>$base/sbin/grub-bios-setup -v 
> --no-rs-codes -m device.map -c ../../`pwd`/temp/boot/grub/core.img -b 
> ../../toolchain/lib/grub/i386-pc/boot.img /dev/disk2
> /toolchain/sbin/grub-bios-setup: info: adding `hd0' -> `/dev/disk2' from 
> device.map.
> /toolchain/sbin/grub-bios-setup: info: /dev/disk2 is present.
> /toolchain/sbin/grub-bios-setup: info: Looking for /dev/disk2.
> /toolchain/sbin/grub-bios-setup: info: /dev/disk2 is a parent of /dev/disk2.
> /toolchain/sbin/grub-bios-setup: info: Looking for /dev/disk2.
> /toolchain/sbin/grub-bios-setup: info: /dev/disk2 is a parent of /dev/disk2.
> /toolchain/sbin/grub-bios-setup: info: transformed OS device `/dev/disk2' into 
> GRUB device `hd0'.
> /toolchain/sbin/grub-bios-setup: info: reading 
> /boot/grub/../../toolchain/lib/grub/i386-pc/boot.img.
> /toolchain/sbin/grub-bios-setup: info: reading 
> /boot/grub/../..//Users/peter/NetBeansProjects/PeterI/temp/boot/grub/core.img.
> /toolchain/sbin/grub-bios-setup: info: root is `(null)', dest is `hd0'.
> /toolchain/sbin/grub-bios-setup: info: Opening dest.
> /toolchain/sbin/grub-bios-setup: info: drive = 0.
> /toolchain/sbin/grub-bios-setup: info: the size of hd0 is 0.
> /toolchain/sbin/grub-bios-setup: info: changing current directory to /dev.
> /toolchain/sbin/grub-bios-setup: info: changing current directory to fd.
> /toolchain/sbin/grub-bios-setup: info: /dev/rdisk1 is not present.
> /toolchain/sbin/grub-bios-setup: info: Looking for /dev/rdisk1.
> /toolchain/sbin/grub-bios-setup: info: /dev/rdisk1 is a parent of /dev/rdisk1.
> /toolchain/sbin/grub-bios-setup: info: Looking for /dev/rdisk1.
> /toolchain/sbin/grub-bios-setup: info: /dev/rdisk1 is a parent of /dev/rdisk1.
> /toolchain/sbin/grub-bios-setup: info: drive = 1.
> /toolchain/sbin/grub-bios-setup: error: guessing the root device failed, 
> because of `disk `hostdisk//dev/rdisk1' not found'.

The file core.img must be on partition that is accessible at boot time. 
Your file is on /dev/disk1 so GRUB tries to resolve it.

Do not use grub-bios-setup, this is internal tool. Use grub-install 
which will copy GRUB binaries to /boot/grub in suitable location and 
call grub-bios-setup with correct parameters. In Linux that would be 
(assuming /boot is on the first partition of image)

losetup -P /dev/loop0 /path/to/image
mount /dev/loop0p1 /mnt
grub-install --boot-directory=/mnt /dev/loop0