System hangs in reset_device()

Hi,

I'm using a Stratix II development board with NIOS II 1.1 and I am trying to initialize the network interface and the lightweight IP stack as done in the web server example. The network interface is present in my SOPC design.

However, when I initialise the hardware using lwip_devices_init(PRIORITY), it hangs in reset_device():

12 OSIntCtxSw() at \cygdrive\c\altera\kits\nios2\components\altera_nios2\UCOSII\src\os_cpu_a.S:126
11 OS_Sched() at \cygdrive\c\altera\kits\nios2\components\micrium_uc_osii\UCOSII\src\os_core.c:1199
10 OSTimeDly() at \cygdrive\c\altera\kits\nios2\components\micrium_uc_osii\UCOSII\src\os_time.c:55
9 usleep() at \cygdrive\c\altera\kits\nios2\components\altera_nios2\UCOSII\src\alt_usleep.c:90
8 reset_device() at \cygdrive\c\altera\kits\nios2\components\altera_avalon_lan91c111\UCOSII\src\altera_avalon_lan91c111.c:466
7 low_level_init() at \cygdrive\c\altera\kits\nios2\components\altera_avalon_lan91c111\UCOSII\src\altera_avalon_lan91c111.c:753
6 alt_avalon_lan91c111_init() at \cygdrive\c\altera\kits\nios2\components\altera_avalon_lan91c111\UCOSII\src\altera_avalon_lan91c111.c:163
5 netif_add() at \cygdrive\c\altera\kits\nios2\components\altera_lwip\UCOSII\src\downloads\lwip-0.7.2\src\core\netif.c:85
4 lwip_devices_init() at \cygdrive\c\altera\kits\nios2\components\altera_lwip\UCOSII\src\alt_lwip_dev.c:135
3 init_done_func() at ..\SystemInit\Special_c_func.cc:22
2 tcpip_thread() at \cygdrive\c\altera\kits\nios2\components\altera_lwip\UCOSII\src\downloads\lwip-0.7.2\src\api\tcpip.c:92
1 OSStartTsk() at \cygdrive\c\altera\kits\nios2\components\altera_nios2\UCOSII\src\os_cpu_a.S:265

The software initialization appears to complete successfully, but I am stuck at the this point. I have been trying to give different IRQ numbers, to give different priorities to the tasks, reloading the quartus II design many times and resetting the board by taking off the power and waiting for 30 seconds.

Does anyone have an idea would could be going on?