[syslinux] PXELINUX 4.10-pre17 and newer Dell OptiPlex/Latitude/Precision

H. Peter Anvin hpa at zytor.com
Mon Jan 2 16:42:02 PST 2012


On 12/31/2011 06:57 AM, Gene Cumm wrote:
> Shantanu, let's continue here.
> 
> You first noticed this on a Dell OptiPlex 755.  I think it covers all Dell
> OptiPlex/Latitude/Precision models that are PCIe based with Intel LoM (LAN
> on motherboard) utilizing the BIOS PXE OROM, based on the similarity of
> these systems.  The symptoms are that PXELINUX requests pxelinux.cfg/<UUID>
> by TFTP (but it might not strictly be a TFTP issue) when not on the same
> subnet, responses are sent back but PXELINUX doesn't receive these
> packets.  PXELINUX also doesn't respond to ICMP echo (ping) or ARP requests
> but repeatedly sends ARP requests for the gateway, as if it doesn't receive
> the replies.  When on the same subnet, Shantanu reports that it seems to
> hang on the request of pxelinux.cfg/default.
> 
> I also tried 4.10-pre13 to no avail.
> 
> This makes me think it goes deaf/ignorant for some reason.  My next tests
> are TFTP on same subnet, HTTP on same and different subnets then a debug
> build with the serial port.
> 

OK, this is very interesting... in particular this seems like something
that should be worth debugging.  I'm wondering if we're doing the right
thing for the receive; in particular, what are the flags settings for
these?  I'm wondering if we need to poll but are expecting interrupts,
or vice versa...

	-hpa


-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.




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