Re: [PATCH] Create floppy emulation boot CD with grub-mkimage

[Christian Franke <Christian.Franke@t-online.de>]

Robert Millan wrote:
> On Fri, Feb 08, 2008 at 07:45:48PM +0100, Christian Franke wrote:
>   
>> A CD created by "grub-mkrescue --image-type=cdrom" does not work for me 
>> for some reason.
>>     
>
> This is AFAIK the most widely used method for CD boot.  Do other CDs work for
> you?
>
>   

Yes, all of my boot CDs work :-)

Meantime, I found the problem: cdboot.img was > 512 bytes. I forgot to 
add the ld script necessary for the Cygwin build (-N does not work). 
Should have checked this first, sorry.

Now the CD boots, but the result is interesting:

Real PC: escape to rescue mode, root=hd31, no (cd0) device, no modules.

VMWare: same.

VirtualPC: escape to rescue mode, root=cd15, (cd0) exists, normal mode 
can be started manually.

VirtualBox: Works as expected.


Both floppy and "floppy(on)cd" both work as expected.


> If this is a bug, I think it's better to fix it instead of adding workarounds.
>
>   

Yes, but the patch provides the end-user with a simple way to create a 
fall back boot CD when the normal boot CD does not work for whatever 
reason. And the patch does not break anything existing.

Christian