I want to make network work with Qemu using the tap device.

I tried this out using a debian-wheezy (http://elinux.org/BeagleBoardDebian#Debian_Wheezy_snapshot) and Linaro (nano) (http://www.linaro.org/downloads/1203) for the beagleboard and following some instructions online to set up the tap device.

In both cases it did not work and I only see an usb0 device set up but not configured/linked. The eth0 fails while booting.

Debugging Qemu while loading I found the following problem. Could you help me with that?

1. tap0 device already set up:

2. Command line:

sudo qemu-system-arm -M beagle -m 512 -drive file=beagle-wheezy.img,if=sd,cache=writeback -clock unix -netdev tap,id=mynet,ifname=tap0,script=no -usb -device usb-net,netdev=mynet -serial stdio

3. Debugging Qemu:

Cause of crash: s->dev.config IS NULL

Program terminated with signal 11, Segmentation fault.

#0  0xb74af3f1 in is_rndis (s=0xb9c73c20)

    at /home/sferlin/qemu-linaro-1.1.0-2012.06/hw/usb/dev-network.c:650

650     return s->dev.config->bConfigurationValue == DEV_RNDIS_CONFIG_VALUE;

(gdb) up

#1  0xb74b0c24 in usbnet_can_receive (nc=0xb9c763c8)

    at /home/sferlin/qemu-linaro-1.1.0-2012.06/hw/usb/dev-network.c:1292

1292     if (is_rndis(s) && s->rndis_state != RNDIS_DATA_INITIALIZED) {

(gdb) up

#2  0xb741bc48 in qemu_can_send_packet (sender=0xb9bf4d20) at net.c:367

367                    !sender->peer->info->can_receive(sender->peer)) {

(gdb) up

#3  0xb7423b4b in tap_can_send (opaque=0xb9bf4d20) at net/tap.c:175

175     return qemu_can_send_packet(&s->nc);

(gdb) up

#4  0xb738b1b5 in qemu_iohandler_fill (pnfds=0xb7bc3f00, readfds=0xb7bc3d80, 

    writefds=0xb7bc3e00, xfds=0xb7bc3e80) at iohandler.c:101

101              ioh->fd_read_poll(ioh->opaque) != 0)) {