>I suspect it depends on the gem's revision - those reporting problems have 
>rev. 0, those who didn't have rev. 1 - at least as far as I can tell.
>
>have fun
>Michael

Sorry, I've been slow getting you the dmesg and gem pcictl dump output
you'd asked for, mine is below.  It looks like I have a revision 0 GMAC
too.

Dave

dmesg is:

NetBSD 3.1 (ARCUSV) #0: Thu Mar 29 23:50:54 EDT 2007
        root@arcusv.nonus-porta.net:/usr/src/sys/arch/macppc/compile/ARCUSV
total memory = 320 MB
avail memory = 302 MB
mainbus0 (root)
cpu0 at mainbus0: 750 (Revision 3.0), ID 0 (primary)
cpu0: HID0 8090c0a4<EMCP,DOZE,DPM,ICE,DCE,SGE,BTIC,BHT>
cpu0: 366.67 MHz, no-parity 512KB WB L2 cache (PB SRAM) at 2.5:1 ratio
uninorth0 at mainbus0
pci0 at uninorth0 bus 0
pci0: i/o space, memory space enabled
pchb0 at pci0 dev 11 function 0
pchb0: Apple Computer UniNorth AGP Interface (rev. 0x00)
ofb0 at pci0 dev 16 function 0: ATI Technologies Rage L Mobility
ofb0: 800 x 600, 8bpp
wsdisplay0 at ofb0 kbdmux 1: console (std, vt100 emulation)
wsmux1: connecting to wsdisplay0
uninorth1 at mainbus0
pci1 at uninorth1 bus 0
pci1: i/o space, memory space enabled
pchb1 at pci1 dev 11 function 0
pchb1: Apple Computer UniNorth Host-PCI Bridge (rev. 0x00)
obio0 at pci1 dev 23 function 0: addr 0x80000000
enabling KeyLargo internal modem
i2s at obio0 offset 0x10000 not configured
zsc0 at obio0 offset 0x13000: irq 22,50
zstty0 at zsc0 channel 0
zstty1 at zsc0 channel 1
adb0 at obio0 offset 0x16000 irq 47: 3 targets
aed0 at adb0 addr 0: ADB Event device
akbd0 at adb0 addr 2: PowerBook G3 keyboard
wskbd0 at akbd0: console keyboard, using wsdisplay0
ams0 at adb0 addr 3: EMP trackpad <tpad> 2-button, 400 dpi
wsmouse0 at ams0 mux 0
abtn0 at adb0 addr 7: buttons
apm0 at adb0: battery flags 0x1, 0% charged
battery at obio0 offset 0x0 not configured
backlight at obio0 offset 0xf300 not configured
wdc0 at obio0 offset 0x1f000 irq 19: DMA transfer
atabus0 at wdc0 channel 0
wdc1 at obio0 offset 0x20000 irq 20: DMA transfer
atabus1 at wdc1 channel 0
wdc2 at obio0 offset 0x21000 irq 21: DMA transfer
atabus2 at wdc2 channel 0
ohci0 at pci1 dev 24 function 0: Apple Computer KeyLargo USB Controller 
(rev. 0x00)
ohci0: interrupting at irq 27
ohci0: OHCI version 1.0
usb0 at ohci0: USB revision 1.0
uhub0 at usb0
uhub0: Apple Computer OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
ohci1 at pci1 dev 25 function 0: Apple Computer KeyLargo USB Controller 
(rev. 0x00)
ohci1: can't map mem space
uninorth2 at mainbus0
pci2 at uninorth2 bus 0
pci2: i/o space, memory space enabled
pchb2 at pci2 dev 11 function 0
pchb2: Apple Computer UniNorth Host-PCI Bridge (rev. 0x00)
gem0 at pci2 dev 15 function 0: Apple Computer GMAC Ethernet (rev. 0x00)
gem0: interrupting at irq 41
gem0: Ethernet address XX:XX:XX:XX:XX:XX, 10KB RX fifo, 9KB TX fifo
bmtphy0 at gem0 phy 0: BCM5201 10/100 media interface, rev. 2
bmtphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
Kernelized RAIDframe activated
uhidev0 at uhub0 port 1 configuration 1 interface 0
uhidev0: Logitech USB-PS/2 Optical Mouse, rev 2.00/11.10, addr 2, iclass 3/1
ums0 at uhidev0: 3 buttons and Z dir.
wsmouse1 at ums0 mux 0
wd0 at atabus0 drive 0: <TOSHIBA MK6014MAP>
wd0: drive supports 16-sector PIO transfers, LBA addressing
wd0: 5729 MB, 12416 cyl, 15 head, 63 sec, 512 bytes/sect x 11733120 sectors
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 4 (Ultra/66)
wd0(wdc0:0:0): using PIO mode 4, DMA mode 2, Ultra-DMA mode 4 (Ultra/66) 
(using DMA)
atapibus0 at atabus1: 2 targets
cd0 at atapibus0 drive 0: <MATSHITA CR-175, , 5AAE> cdrom removable
cd0: drive supports PIO mode 4, DMA mode 2
cd0(wdc1:0:0): using PIO mode 4, DMA mode 2 (using DMA)
boot device: wd0
root on wd0a dumps on wd0b
root file system type: ffs

pcictl output is:

[disciple@arcusv:disciple]$ /usr/sbin/pcictl pci2 list
000:11:0: Apple Computer UniNorth Host-PCI Bridge (host bridge)
000:15:0: Apple Computer GMAC Ethernet (ethernet network)
[disciple@arcusv:disciple]$ /usr/sbin/pcictl pci2 dump -d 15
PCI configuration registers:
  Common header:
    0x00: 0x0021106b 0x84a00016 0x02000000 0x00001008

    Vendor Name: Apple Computer (0x106b)
    Device Name: GMAC Ethernet (0x0021)
    Command register: 0x0016
      I/O space accesses: off
      Memory space accesses: on
      Bus mastering: on
      Special cycles: off
      MWI transactions: on
      Palette snooping: off
      Parity error checking: off
      Address/data stepping: off
      System error (SERR): off
      Fast back-to-back transactions: off
    Status register: 0x84a0
      Capability List support: off
      66 MHz capable: on
      User Definable Features (UDF) support: off
      Fast back-to-back capable: on
      Data parity error detected: off
      DEVSEL timing: slow (0x2)
      Slave signaled Target Abort: off
      Master received Target Abort: off
      Master received Master Abort: off
      Asserted System Error (SERR): off
      Parity error detected: on
    Class Name: network (0x02)
    Subclass Name: ethernet (0x00)
    Interface: 0x00
    Revision ID: 0x00
    BIST: 0x00
    Header Type: 0x00 (0x00)
    Latency Timer: 0x10
    Cache Line Size: 0x08

  Type 0 ("normal" device) header:
    0x10: 0xf5200000 0x00000000 0x00000000 0x00000000
    0x20: 0x00000000 0x00000000 0x00000000 0x00000000
    0x30: 0xf5000000 0x00000000 0x00000000 0x40400129

    Base address register at 0x10
      type: 32-bit nonprefetchable memory
      base: 0xf5200000, not sized
    Base address register at 0x14
      not implemented(?)
    Base address register at 0x18
      not implemented(?)
    Base address register at 0x1c
      not implemented(?)
    Base address register at 0x20
      not implemented(?)
    Base address register at 0x24
      not implemented(?)
    Cardbus CIS Pointer: 0x00000000
    Subsystem vendor ID: 0x0000
    Subsystem ID: 0x0000
    Expansion ROM Base Address: 0xf5000000
    Reserved @ 0x34: 0x00000000
    Reserved @ 0x38: 0x00000000
    Maximum Latency: 0x40
    Minimum Grant: 0x40
    Interrupt pin: 0x01 (pin A)
    Interrupt line: 0x29

  Device-dependent header:
    0x40: 0x00000000 0x00000000 0x00000000 0x00000000
    0x50: 0x00000000 0x00000000 0x00000000 0x00000000
    0x60: 0x00000000 0x00000000 0x00000000 0x00000000
    0x70: 0x00000000 0x00000000 0x00000000 0x00000000
    0x80: 0x00000000 0x00000000 0x00000000 0x00000000
    0x90: 0x00000000 0x00000000 0x00000000 0x00000000
    0xa0: 0x00000000 0x00000000 0x00000000 0x00000000
    0xb0: 0x00000000 0x00000000 0x00000000 0x00000000
    0xc0: 0x00000000 0x00000000 0x00000000 0x00000000
    0xd0: 0x00000000 0x00000000 0x00000000 0x00000000
    0xe0: 0x00000000 0x00000000 0x00000000 0x00000000
    0xf0: 0x00000000 0x00000000 0x00000000 0x00000000