[syslinux] No localboot on HP Proliant with Smart Array and menu.c32

[H. Peter Anvin]

Ulrich Wiedemann wrote:
>> Why did the previus patch work at all? the only changes there were as far as I could see which segments stored where, and no changes to avoid using any memory segments that the prolient might use?
> 
> My guess would be that this depends on the functionality you use of the 
> menu.c32 (or which uses a COM32 module in general).
> 
> I have no glue about the exact use of the segments, but from my 
> understanding I would expect that vk_seg is not used with this very 
> primitive configuration:
> 
> default menu.c32
> 
> label local
> 	localboot 0
> 
> This is approximately what I used for testing.
> 
> So if the memory block in question is located at the segment 3000h, it 
> would match in one case with pktbuf_seg, in the other with vk_seg.
> 
> My patch is by no means a fix, it was only meant to confirm that the 
> change in question is related to the problem.
> 

Actually, as soon as you have "label", you're touching vk_seg (except in 
3.62, which doesn't have vk_seg at all), but yes, most likely there is a 
low memory clobber somewhere, and just shuffling the memory map around 
avoids getting stepped on.

How to debug it, and even more, how to fix it, is tricky.  I don't know 
if HP has any interest in assisting with a machine that old although I 
have a few channels I might be able to poll.

	-hpa