Christos Zoulas wrote:
> You can certainly try to do this. FreeBSD/current supports this chip
> so you can look in their cvs tree for the necessary changes.
> http://lists.freebsd.org/pipermail/freebsd-hackers/2005-March/010936.html


I looked in bge driver of NetBSD-current as well as FreeBSD's and OpenBSD's.
FreeBSD has some differences but, OpenBSD looks like similar. Three of them
includes lines about BCM5721.

I made some changes:
I added to pcidevs
product BROADCOM BCM5721	0x1659	BCM5721 10/100/1000 Ethernet

executed "make -f Makefile.pcidevs" and regen pcidevs.h and pcidevs_data.h

added to if_bge.c under bge_products[]
{ PCI_VENDOR_BROADCOM,
  PCI_PRODUCT_BROADCOM_BCM5721,
 "Broadcom BCM5721 Gigabit Ethernet", },

recompiled and installed new kernel.
After rebooting, new kernel dropped into ddb>
Kernel: page fault trap, code 0
Stopped at      netbsd:bge_intr 0x266 ...

What else can I do? Should I send PR?