Re: GRUB2 support for "map()" and "liveswap"

[Mellissa Dalby]

Hi Andrei,

Thanks for the tips, I'll try that.

Here's a link that describes the proper use of liveswap in the old GRUB, implemented on the "Super Grub Boot Disk" as I mentioned it:

http://www.supergrubdisk.org/wiki/SGD_liveswap

On Dec 9, 2014, at 14:06, Andrei Borzenkov <address@hidden> wrote:

В Tue, 9 Dec 2014 13:52:44 -0500
Mellissa Dalby <address@hidden> пишет:

Hi Andrei,

The "map()" and "liveswap" commands were working in the legacy GRUB (version 0.97 I think).

They somehow make it possible to work around BIOS limitations in older systems that prevent the GRUB Bootloader from vectoring off to another hard disk to boot.

For EXAMPLE:

/dev/sda1       /boot   GRUB

/dev/sda2       /   LINUX boots OK

/dev/sdb1      Windows no boot!

Grub entries using "map()" and "liveswap":

map (hd0) (hd1)

map (hd1) (hd0)

liveswap

I have never heard about liveswap, but drivemap command in grub2 should
do what you need.

drivemap -s (hd0) (hd1)

Somehow fools the BIOS into believing /dev/sdb1 is actually /dev/sda1.

I don't know how it does that because I never fetched the legacy GRUB source code.

On Dec 9, 2014, at 13:23, Andrei Borzenkov <address@hidden> wrote:

В Tue, 9 Dec 2014 05:51:22 -0500

Mellissa Dalby <address@hidden> пишет:

Hi GRUB community,

GRUB has become my Bootloader of choice.

I do like the development progression of GRUB2 but I STILL NEED "map()" and

"liveswap"

Could you explain what they do? Any links to description or

implementation?

to support existing hardware.

PLEASE consider adding it to GRUB2.