em: "Hardware Initialization Failed" on 8.0-RELEASE

[Ryan Stone]

8.0-RELEASE is not able to bring up some of the my em interfaces.  The
error message that I get is:

em0: <Intel(R) PRO/1000 Network Connection 6.9.14> port 0xa800-0xa81f
mem 0xce480000-0xce49ffff,0xce460000-0xce47ffff irq 16 at device 0.0
on pci1
em0: Reserved 0x20000 bytes for rid 0x10 type 3 at 0xce480000
em0: attempting to allocate 1 MSI vectors (1 supported)
msi: routing MSI IRQ 256 to local APIC 0 vector 48
em0: using IRQ 256 for MSI
em0: Using MSI interrupt
em0: Hardware Initialization Failed
em0: Unable to initialize the hardware
device_attach: em0 attach returned 5
em1: <Intel(R) PRO/1000 Network Connection 6.9.14> port 0xac00-0xac1f
mem 0xce4e0000-0xce4fffff,0xce4c0000-0xce4dffff irq 17 at device 0.1
on pci1
em1: Reserved 0x20000 bytes for rid 0x10 type 3 at 0xce4e0000
em1: attempting to allocate 1 MSI vectors (1 supported)
msi: routing MSI IRQ 256 to local APIC 0 vector 48
em1: using IRQ 256 for MSI
em1: Using MSI interrupt
em1: Hardware Initialization Failed
em1: Unable to initialize the hardware
device_attach: em1 attach returned 5


I tried enabling all of the debug output I could find in the em driver
and got the following output(I truncated most of it because it didn't
look interesting).

e1000_set_d0_lplu_state_82571
e1000_read_phy_reg_igp
e1000_get_hw_semaphore_82571
e1000_write_phy_reg_mdic
e1000_read_phy_reg_mdic
MDI Error

e1000_put_hw_semaphore_generic
Error Disabling LPLU D0

e1000_clear_hw_cntrs_82571
e1000_clear_hw_cntrs_base_generic
em0: Hardware Initialization Failed
em0: Unable to initialize the hardware

Here's the pciconf output for the interfaces that are giving me problems:

em0 at pci0:1:0:0: class=0x020000 card=0x125e8086 chip=0x105e8086 rev=0x00 hdr=0x00
em1 at pci0:1:0:1: class=0x020000 card=0x125e8086 chip=0x105e8086 rev=0x00 hdr=0x00
em2 at pci0:2:0:0: class=0x020000 card=0x125e8086 chip=0x105e8086 rev=0x00 hdr=0x00
em3 at pci0:2:0:1: class=0x020000 card=0x125e8086 chip=0x105e8086 rev=0x00 hdr=0x00

Please let me know if there's anything else that you need.  I'm
willing to try patches or get more debug output.

Thanks,
Ryan Stone