[Qemu-discuss] Network problems with qemu-system-arm and u-boot

[pietrushnic]

Hi all,
I'm trying to obtain IP address in u-boot using qemu-system-arm 1.4.91 
(commit:38ebb39). Unfortunately u-boot is unable to retrieve packets 
until I add '-net dump,file=/tmp/dump.pcap' to qemu command line.
I'm using bridged tap interface as it was described here: 
http://toast.djw.org.uk/qemu.html <http://toast.djw.org.uk/qemu.html>.

I tried ARM testing image from 
http://wiki.qemu.org/download/arm-test-0.2.tar.gz to verify my network 
configuration and it works fine without additional traffic dump, so it 
looks like it is not configuration issue.
I'm running in to this issue on Ubuntu 12.04, but previously tested on 
Debian wheezy and there was no problem with obtaining packets by u-boot.

So my question is, if someone heard about such anomaly ?
How it is possible that packets cannot get through interface without 
additional dump (delay ?) and magically pass through if dump command was 
added ?
Any thoughts how it could be debugged from qemu side ?

If you need additional information about configuration, just let me know 
what can help.

Regards,
pietrushnic