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

[Andrei Borzenkov]

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.
> >