Broadcom 5721 (bge) on Solaris 10 09/10 (s10u9)

I am in the process of trying out Solaris 10 09/10 (s10u9) on my machines, and encountered problems on my Dell PowerEdge 840 Server. The NIC on that box is a Broadcom 5721.

The NIC does come up, but only receives broadcast and multicast packets, not unicast ones.

As a workaround, I am using the driver from Solaris 10 10/09 (s10u8), which works fine.

Update 02.02.2011:

Problem solved!! I tried to install Solaris 11 Express on this machine and again the NIC wouldn't work. This time I tried a bit harder and found out that I had disabled the PXE Extensions for the NIC in the BIOS. After switching the PXE Extensions back on, it works!

Must be some subtle initialization problem.