[gPXE] wrong mac with rtl8139 nic on qemu-kvm

[Thomas Miletich]

Hello James,
Etherboot is using a different r8139 driver which is also using
different code to read the MAC address. Different behavior could be
explained by this.
It would be very helpful to know if you can reproduce this behavior
with qemu without kvm. If you can't reproduce it with qemu without kvm
it could indicate a timing issue.
Another interesting thing to know would be which address you get if
you change the MAC address to start with something different than
00(qemu -net nic,model=rtl8139,macaddr=01:02:03:04:05:06).  The
interesting part is the first octet. I assume that it will be 00 no
matter what you specify, but it helps to know for sure.

Hopefully I will be able to go through the SPI code in gPXE tomorrow
or on Monday. Maybe this reveals some possible causes for this issue.
I've never heard of this issue on real hardware before, so I think we
should consider a qemu-kvm bug too.

Thanks for reporting
Thomas

On Sat, Dec 19, 2009 at 2:22 AM, James <kojeroo at telus.net> wrote:
> hi... i have a problem with gPXE 0.9.9 for rtl8139 10ec:8139 and qemu-kvm
>
> The first pass of the boot the device mac is sometimes incorrect...
> I see 00:00:d8:ab:e2:7e instead of 00:21:d8:ab:e2:7e.
> The second octet is 00 instead of 21 in the mac.
>
> Is this a known problem?
>
> I don't have this problem if I try with the etherboot rom however.
>
> My DHCP server does not return an IP for unknown MAC addresses.
>
> gPXE 0.9.9 -- Open Source Boot Firmware -- http://etherboot.org
> Features: FTP HTTP HTTPS DNS TFTP bzImage COMBOOT ELF Multiboot NBI PXE
> PXEXT
>
> net0: 00:00:d8:ab:e2:7e on PCI00:03.0 (open)
>   [Link:up, TX:0 TXE:0 RX:0 RXE:0]
> DHCP (net0 00:00:d8:ab:e2:7e)................ Connection timed out
> (0x4c106035)
> No more network devices
>
>
>
>
> gPXE 0.9.9 -- Open Source Boot Firmware -- http://etherboot.org
> Features: FTP HTTP HTTPS DNS TFTP bzImage COMBOOT ELF Multiboot NBI PXE
> PXEXT
>
> net0: 00:21:d8:ab:e2:7e on PCI00:03.0 (open)
>   [Link:up, TX:0 TXE:0 RX:0 RXE:0]
> DHCP (net0 00:21:d8:ab:e2:7e).... ok
> net0: 2.43.241.156/255.255.255.240 gw 2.43.241.145
> Booting from filename "pxelinux.0"
> tftp://2.43.241.155/pxelinux.0.. ok
>
> James
>
>
> _______________________________________________
> gPXE mailing list
> gPXE at etherboot.org
> http://etherboot.org/mailman/listinfo/gpxe
>
>