I'm using hrev42816 with my Aspire 5920G. Ethernet doesn't work and doesn't appear in ifconfig output.
vendor 14e4: Broadcom Corporation
device 1693: NetLink BCM5787M Gigabit Ethernet PCI Express (Aspire 5920G)
KERN: broadcom570x: init_driver(0x81141034)
KERN: [broadcom570x] (bge) bus_alloc_resource(3, [16], 0x0, 0xffffffff, 0x1,0x2)
KERN: [broadcom570x] (bge) adjust device control 0x2000 -> 0x5000
KERN: [broadcom570x] (bge) bus_alloc_resource(1, [0], 0x0, 0xffffffff, 0x1,0x6)
KERN: [broadcom570x] (bge) CHIP ID 0x0000b002; ASIC REV 0x0b; CHIP REV 0xb0; PCI-E
KERN: [broadcom570x] (bge) Disabling fastboot
KERN: [broadcom570x] (bge) firmware handshake timed out, found 0x4b657654
KERN: [broadcom570x] (bge) Disabling fastboot
KERN: [broadcom570x] (bge) firmware handshake timed out, found 0x4b657654
KERN: [broadcom570x] broadcom570x: /dev/net/broadcom570x/0
KERN: [broadcom570x] (bge) PHY read timed out (phy 1, reg 1, val 0x28210000)
KERN: [broadcom570x] (bge) Try again
KERN: [broadcom570x] (bge) PHY write timed out (phy 1, reg 0, val 32768)
KERN: [broadcom570x] (bge) PHY read timed out (phy 1, reg 1, val 0x28210000)
KERN: [broadcom570x] (bge) Try again
KERN: [broadcom570x] (bge) PHY write timed out (phy 1, reg 0, val 32768)
KERN: [broadcom570x] (bge) PHY read timed out (phy 1, reg 1, val 0x28210000)
KERN: [broadcom570x] (bge) Try again
KERN: [broadcom570x] (bge) PHY write timed out (phy 1, reg 0, val 32768)
KERN: [broadcom570x] (bge) PHY read timed out (phy 1, reg 1, val 0x28210000)
KERN: [broadcom570x] (bge) Try again
KERN: [broadcom570x] (bge) PHY write timed out (phy 1, reg 0, val 32768)
KERN: [broadcom570x] (bge) PHY read timed out (phy 1, reg 1, val 0x28210000)
KERN: [broadcom570x] (bge) MII without any PHY!
Same problem with iprowifi3945 on the same laptop: