Re: pxegrub to boot a dos image ?

[Jean-Jacques Michel]

Jean-Claude Giese wrote:
> 
>        Hi,
> 
> I'm trying to replace pxelinux+memdisk with pxegrub to boot a
> dos-image via the network. I'm able to get the grub prompt after a PXE
> boot but I don't know how to load my dos-image and boot it ?
> The dos-image is on the tftp server and works with pxelinux+memdisk.
> I'v tried to load it via the command chainloader (after a "root (nd)"
> but it does not boot ?
> 
> Any idea ?
> 
> Thank you

Grub cannot load the "memdisk" because of its format (BzImage, with
only a setup section, no text/data).

Here is a patch to ./stage2/boot.c that I use to make it 
work (tested on 0.5.96.1 & 0.9x) :

--- /tmp/boot.c Wed Mar 13 09:40:15 2002
+++ boot.c      Wed Mar 13 09:33:59 2002
@@ -341,6 +341,14 @@
            *dest = 0;
          }

+          if (text_len == 0)
+          {
+             grub_close ();
+             linux_text_len = text_len;
+             cur_addr = LINUX_STAGING_AREA + text_len;
+             return big_linux ? KERNEL_TYPE_BIG_LINUX :
KERNEL_TYPE_LINUX;
+          }
+
          /* offset into file */
          grub_seek (data_len + SECTOR_SIZE);

I guess it will also work from a (nd) boot device with :

kernel (nd)/.../memdisk
initrd (nd)/.../yourDOSimage
boot

Have fun ;-)

-- 
Jean-Jacques Michel mailto:address@hidden 
Hardware Engineer - Linbox http://www.linbox.com
Technopôle Metz 2000 - 152 rue de Grigy - 57070 Metz - France
Tel : +33 (0)3 87 75 55 21 - Fax : +33 (0)3 87 75 19 26