Re: [Etherboot-developers] More analysis to the old problem with etherboot+GRUB (diskless/disk)

[Christoph Plattner]

Further experiment: It has nothing to do with the DISKLESS GRUB
version. I booted the "diskless GRUB" from floppy, prepared in
the following way:

        in stage2/ :
        cat start diskless > stage2-diskless

        then stage1 and stage2 on a floppy with `dd'

... and booted. This GRUB works correct, does a bootp, loads the
menu definedwith `T150="...."' and boots CORECCTLY !!! (no crash !)

So really diskless booed GRUB has a problem (independent of GRUB
itself) !

Etherboot problem ?
Is GRUB not completely loaded in RAM ?

Cheers
        Christoph

Christoph Plattner wrote:
> 
> Hello GRUB and Etherboot people,
> 
>         finally I had some time to further analysing the
> problem, I describer a week ago.
> 
> The problem was: I can boot our (company's) OS (multiboot,
> loaded at 1MB) with a GRUB booted by floppy, kernel and
> modules loaded via tftp (plus bootp before...)
> 
> The OS crashes, if I do the same on a diskless booted GRUB.
> 
> Discussions with KEN YAP leads me to the fact, that the
> problem is the ethernet board used twice and is perhaps
> not resetted in the correct way. So I did an experiement
> unsing to different types of ethernet boards. A working
> combination was a NE2000/PCI for etherboot and the i82559
> or 559er base board for the GRUB to download.
> 
> The result: THE SAME. The kernel crashes.
> (By the way, I also tried to embedd the eepro100.c file
> of 4.7.18 into GRUB to have the newest driver... there !).
> 
> So the problem seems not to be direct a problem concerning
> ethernet chip handling. So I have again to analyse the
> differences in those two GRUB versions. Which point can
> influence the loading of this kernel. I really have no
> idea, yet. There are only some lines of C code different.
> 
> And I often use diskless GRUB + Etherboot for Linux, and
> I never had problems... on really many different machines
> and embedded industrial PCs.
> 
> With friendly regards
> 
>         Christoph P.
> 
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