[syslinux] Very slow download with pxelinux > 4.07 on specific hardware

[Ady]

> >> Hello Ady,
> >>
> >> To sum up :
> >>
> >>
> >> _ 4.0x works;
> >> _ 4.10-pre22 (lwip branch) works;
> >> _ 5.01 (elflink branch) works;
> >> _ 5.10 and beyond (lwip merge into elflink) fails; --> pxelinux.0 very slow,
> >> lpxelinux.0 freezes (i don't get the menu)
> >>
> >> I just tried with 6.03 pre 5 :
> >> pxelinux.0 very slow
> >> lpxelinux.0 hangs displaying pxelinux 6.03 lwip
> > Could you try 5.10-pre1 or -pre2 from
> > https://www.kernel.org/pub/linux/utils/boot/syslinux/Testing/5.10/ ?
> >
> Thanks for the suggestion. Not better with both (very slow)
 
Hi Eric,

Could you please perform similar tests with official Syslinux 
5.02-pre{3,2,1}?

 https://www.kernel.org/pub/linux/utils/boot/syslinux/Testing/5.02/ 

 The intention is to narrow down the problematic commit(s) by 
identifying which pre-release is the last to work correctly and the 
first with a different behavior.

As usual, please use the pre-built binaries from each archive, all 
from the same respective version as each pxelinux.0 to be tested, 
including ldlinux.c32, lib*.c32 and any additional c32 module.

TIA,
Ady.