[syslinux] Embedding com32 modules and ldlinux.sys into one file

[Tal Lubko]

> -----Original Message-----
> From: Syslinux [mailto:syslinux-bounces at zytor.com] On Behalf Of Paulo
> Alcantara via Syslinux
> Sent: Monday, January 25, 2016 11:30 PM
> To: Tal Lubko via Syslinux
> Cc: 'H. Peter Anvin'
> Subject: Re: [syslinux] Embedding com32 modules and ldlinux.sys into
> one file
> 
> On Mon, 25 Jan 2016 22:50:24 +0200
> Tal Lubko via Syslinux <syslinux at zytor.com> wrote:
> 
> > > -----Original Message-----
> > > From: poma [mailto:pomidorabelisima at gmail.com]
> > > Sent: Tuesday, January 19, 2016 1:30 PM
> > > To: Tal Lubko; 'H. Peter Anvin'; 'Celelibi'
> > > Cc: 'For discussion of Syslinux and tftp-hpa'
> > > Subject: Re: [syslinux] Embedding com32 modules and ldlinux.sys
> into
> > > one file
> > >
> > > On 19.01.2016 09:07, Tal Lubko via Syslinux wrote:
> > > ...
> > >
> > > > 1) Exposing the bootloader in the BIOS as a (readonly) disk drive
> > > using standard BIOS or EFI interfaces (hpa suggestion).
> > > > This suggestion looks very promising. It probably requires some
> > > changes in the BIOS. I'm not sure if it requires changes in the
> > > bootloader.
> > > > There is one potential problem I see: the bootloader is stored on
> > > some flashrom chip and the Linux image is stored on a different
> > > storage device.
> > > > I think that right now the bootloader assumes they are stored on
> > > > the
> > > same storage device. Am I wrong?
> > > > If I'm wrong, how do I tell the bootloader to load the Linux
> image
> > > from a different storage device?
> > > >
> > >
> > > MultiFS pro tempore with QEMU/SeaBIOS only
> > > http://bugzilla.syslinux.org/show_bug.cgi?id=67
> > >
> >
> > Hi Poma
> >
> > I'm trying to test MultiFS support but not sure how to do it.
> > How do I apply the MultiFS patch?
> >
> > I've seen some e-mails talking about integrating it some branches but
> > I'm not sure it we done.
> 
> The patchset can be found at my repo:
> 
> git://git.zytor.com/users/pcacjr/syslinux.git multifs-for-upstream
> 
> I should push it out to a separate branch on the official repo soon as
> it was proposed before.
> 
> Thanks,
> 
> Paulo
> 
> --
> Paulo Alcantara, HP Inc.
> Speaking for myself only.
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Hi

I got it this way:
git clone git://git.zytor.com/users/pcacjr/syslinux.git
git checkout origin/multifs-for-upstream

I've built it for BIOS system (make bios) and it seems to be working !!!
If I understand the syntax correct, it is:
(hdX,Y)/path/to/file", where X is disk number and Y is partition number.
As far as I understand X and Y are zero based.

I've tested it with qemu and 2 disks:
- the first with bootloader
- the second with kernel+rootfs

I've used the following configuration file label:

label MULTIFS
  KERNEL (hd1,1)/mfs/bzImage
  APPEND root=/dev/ram0 initrd=(hd1,1)/mfs/rootfs.ext2 ramdisk_size=65536
quiet

I've also tried to load kernel from one disk and rootfs from another disk
and it also seems to be working.

Thanks for the help,
Tal