Re: how to script for SLAM

Paul,

If you're able to use PXELINUX to load WinPE via MEMDISK but not from gPXE,  
you may want to try chainloading PXELINUX with your modified gPXE binary  
and then loading MEMDISK and WinPE from PXELINUX under gPXE, which at that  
point *should* support the SLAM protocol.

When PXELINUX is chainloaded with gPXE, gPXE's protocol support is extended  
to PXELINUX.

There's a DHCP option that you can set for PXELINUX that determines  
the "TFTP Prefix" you see when booting a client, which you can set  
to "x-slam://slamserver" to force use of the SLAM protocol. I don't know  
which option it is off the top of my head, though.

Also, someone else may be able to add some more information, as there may  
be some sort of issue with the use of SLAM itself. Though that's just a  
guess on my part.

Good luck, Paul.

-Andrew Bobulsky

On Sep 18, 2009 10:38am, ShenQiyu <[email protected]> wrote:

> Dear Shao,



> Thanks!



> Following your guide, I have completed the test.



> But I could only boot winpe 2.0 with MEMDISK in VMWare virtual machine  
> with 512M or 1G memory .



> When I use Lenovo T400 notebook, it failed .



> The winpe image could be downloaded and the initial boot is successful.  
> The windows boot loader started and shows that winpe.wim is loaded. But  
> after that the screen will show nothing. And I tried tftp and http  
> protocol to download the image, the result is the same.



> Then, I try it with PXELINUX and MEMDISK, the booting is successful into  
> PE environment every time.



> When break the MEMDISK before the actual boot, there could be found  
> something different:

> With gpxe, the ramdisk is at 0x8f800000, but with pxelinux, the ramdisk  
> is a little higher at 0x966ae000.



> The machine has 4G memory and the winpe image size is about 112M.



> Could please anyone give me some hints for it?



> Regards!



> Paul

> > Subject: RE: [Etherboot-discuss] how to script for SLAM
> > Date: Fri, 28 Aug 2009 11:29:20 -0400
> > From: [email protected]
> > To: [email protected]
> > CC: [email protected]
> >
> > Good day Paul,
> >
> > You asked about using gPXE to fetch and load a Windows PE environment
> > utilizing MEMDISK.
> >
> > Your first question seemed to be concerning HTTP versus TFTP. In your
> > sample script, replace
> >
> > http://webserver/
> >
> > with
> >
> > tftp://tftpserver/
> >
> > and that should do the trick.
> >
> > Your second question concerned the SLAM protocol, so you might enjoy a
> > look at the gPXE source code file gpxe/src/net/udp/slam.c It sort of
> > looks like you'd have to replace
> >
> > http://webserver/
> >
> > with
> >
> > x-slam://slamserver/
> >
> > as well as to enable the SLAM protocol in a gPXE compilation, by editing
> > gpxe/src/config/general.h and changing the line
> >
> > #undef DOWNLOAD_PROTO_SLAM
> >
> > to
> >
> > #define DOWNLOAD_PROTO_SLAM
> >
> > and then recompiling gPXE.
> >
> > I hope this helps.
> >
> > - Shao Miller

> 与任何您希望的人分享您的回忆。 任何您希望的人。

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