Syslinux - Mar 2013 - Booting an ISO with FreeDOS over PXE with memdisk

I've got $SUBJ almost working except for the DOS bit where the CD needs
to be read. 

My pxe config:

label Firmware
    menu label Update IPMI firmware
    kernel memdisk
    append keeppxe raw iso  initrd=<isofile>

The ISO is about 400Mb, and works fine when I boot it from an actual
CDROM drive.  It also boots fine over PXE, I can see FreeDOS being
booted up etc. The problem is - once in DOS, there is no access to the
CD.  The CDROM driver doesn't load due to "no cdrom found".  Does
this
ring a bell with anyone?
The ISO is from a manufacturer, but I can modify it if needed (change
the DOS setup for instance). 
>From the FreeDOS boot image: 
config.sys:
DEVICE=FDXMS.SYS
DEVICE=SRDXMS.SYS
DOS=HIGH, UMB
LASTDRIVE=Z
BREAK=ON
DEVICE=CDDRV.SYS /D:mscd001
STACKS=9,256

autoexec.bat:
@echo off
PROMPT $P$G
VERIFY ON
BREAK ON
SRDISK 4096
LH SHSUCDX.EXE /D:mscd001,F,,1




-- 
Per Jessen, Z?rich (0.5?C)
http://www.dns24.ch/ - free DNS hosting, made in Switzerland.

On Fri, 01 Mar 2013 08:38:42 +0100 Per Jessen <per at computer.org> wrote:
> I've got $SUBJ almost working except for the DOS bit where the CD
> needs to be read. 
> 
> My pxe config:
> 
> label Firmware
>     menu label Update IPMI firmware
>     kernel memdisk
>     append keeppxe raw iso  initrd=<isofile>
> 
> The ISO is about 400Mb, and works fine when I boot it from an actual
> CDROM drive.  It also boots fine over PXE, I can see FreeDOS being
> booted up etc. The problem is - once in DOS, there is no access to the
> CD.  The CDROM driver doesn't load due to "no cdrom found". 
Does this
> ring a bell with anyone?
Might be completely on a wrong track, but doesn't memdisk emulate hard
drive? In which case you should see the content of your isofile as C:
once FreeDOS boot up, (and CDDRV.SYS won't find any CD devices because
there isn't one to find).

Misha


-- 
Vanush "Misha" Paturyan
Senior Technical Officer
Room 1.37
Computer Science Department
NUI Maynooth
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On 02/28/2013 11:38 PM, Per Jessen wrote:
> I've got $SUBJ almost working except for the DOS bit where the CD needs
> to be read. 
> 
> My pxe config:
> 
> label Firmware
>     menu label Update IPMI firmware
>     kernel memdisk
>     append keeppxe raw iso  initrd=<isofile>
> 
> The ISO is about 400Mb, and works fine when I boot it from an actual
> CDROM drive.  It also boots fine over PXE, I can see FreeDOS being
> booted up etc. The problem is - once in DOS, there is no access to the
> CD.  The CDROM driver doesn't load due to "no cdrom found". 
Does this
> ring a bell with anyone?
> The ISO is from a manufacturer, but I can modify it if needed (change
> the DOS setup for instance). 
> 
>>From the FreeDOS boot image: 
> 
> config.sys:
> DEVICE=FDXMS.SYS
> DEVICE=SRDXMS.SYS
> DOS=HIGH, UMB
> LASTDRIVE=Z
> BREAK=ON
> DEVICE=CDDRV.SYS /D:mscd001
> STACKS=9,256
> 
You probably want to replace CDDRV.SYS (which almost certainly tries to
do direct I/O to the CD-ROM drive) with ELTORITO.SYS (which is included
in the Syslinux distribution.)

	-hpa