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Re: CD-ROM booting staus update
From: |
Robert Millan |
Subject: |
Re: CD-ROM booting staus update |
Date: |
Sun, 1 Jul 2007 13:57:49 +0200 |
User-agent: |
Mutt/1.5.13 (2006-08-11) |
On Thu, Jun 28, 2007 at 10:04:12AM -0400, Alex Roman wrote:
> On 26/06/07, Alex Roman <address@hidden> wrote:
> >Thought I'd write a little status update on this project.
>
> All right, I took a look at the Bochs BIOS source code, and they seem
> to be implementing just one Int 13h function that is specified in the
> Eltorito specification: the 4B01h that isolinux needs to boot.
>
> Next, I started to use Bochs' internal debugger and I noticed that the
> grub_gate_a20 function clobbers %edx which was what was causing me the
> grief, since I was holding the number of bytes to copy from my buffer
> (that I read into from the CD) to 7c00h. So, instead of copying at
> least 2k which is what ISOLINUX expects, it was copying only 224 bytes
> (or something like that, the leftover value in %edx).
>
> Now that I figured that out, *I managed to get the FreeDOS CD to boot! :)*
Congrats :-)
--
Robert Millan
My spam trap is address@hidden Note: this address is only intended
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- Re: CD-ROM booting staus update,
Robert Millan <=
Re: CD-ROM booting staus update, Johan Rydberg, 2007/07/09