Bug 22947

	I have two laptops, the "old laptop", and the "new laptop".
	Inspired by the recent progress in the CardBus code, I obtained
	a pair of IBM 10/100 EtherJet Cardbus ReadyPort adapters,
	which were manufactured for IBM by Xircom, and are really
	Xircom 10/100 RealPort cards.

	First of all, both cards work (almost) fine with the if_dc driver.
	When connected to my network, either laptop alone works fine.
	But both laptops cannot be connected at the same time.

	The problem: both cards come up with the same MAC address,
	00:03:01:81:44:04.

	This MAC address *does not match* the MAC address printed on
	the outside of either card.  When the cards are used under
	Windows 98, I have verified that the MAC address used matches
	the one printed on the back of the card.

	Attempts to manually configure the MAC addresses, using
	"ifconfig ether", also did not appear to work.

	Examination of kernel messages showed that the correct MAC
	address is contained in CardBus configuration ROM for the
	card, but does not appear to be obviously marked as such.
	The relevant "dmesg" excerpt is appended.

	Summary: there appear to be two bugs.

	1.  the MAC address from CardBus configuration ROM is not getting
	    propagated to the ethernet drivers.

	2.  the if_dc driver does not appear to be able to reset its
	    MAC address to a different value than the default it somehow
	    comes up with via "ifconfig ether".

	cardbus0: reading CIS data from ROM
	Product version: 5.0
	Product name: IBM | 10/100 EtherJet CardBus Adapter with 56K Modem | IBMM56 | 1.03 | 
	TUPLE: Unknown(0x88) [4]: fd 4a bb 00
	TUPLE: Unknown(0x8a) [12]: 4a 31 35 43 46 42 42 34 41 46 44 00
	TUPLE: Unknown(0x8b) [4]: 01 00 00 00
	Manufacturer ID: a400030181
	TUPLE: DATE [4]: 42 92 7f 26
	Functions: Network Adaptor, Multi-Functioned
	Function Extension: 04060004acbb4afd
				^^^^^^^^^^^^ correct MAC address
	Function Extension: 0102
	Function Extension: 0280969800
	Function Extension: 0200e1f505
	Function Extension: 0301
	Function Extension: 0303
	Function Extension: 0501
	TUPLE: DEVICE_OC [4]: 02 4f 02 ff
	cardbus0: Opening BAR: type=MEM, bar=10, len=0080
	cardbus0: Opening BAR: type=MEM, bar=14, len=0080
	cardbus0: Opening BAR: type=MEM, bar=18, len=0100
	cardbus0: Opening BAR: type=MEM, bar=28, len=0400
	TUPLE: CONFIG_CB [7]: 03 02 03 01 00 00 ff
	TUPLE: CFTABLE_ENTRY_CB [8]: 41 b0 b0 bc 8e 0e fb 04
	TUPLE: CFTABLE_ENTRY_CB [9]: 02 b8 02 b0 bc 8e 1c fb 04
	TUPLE: NO_LINK [0]:
	dc0: <Xircom X3201 10/100BaseTX> port 0x2000-0x207f mem 0x18023400-0x180237ff,0x18023100-0x180231ff,0x18023080-0x180230ff,0x18023000-0x1802307f,0x18024000-0x18027fff,0x18022800-0x18022fff,0x18022000-0x180227ff irq 11 at device 0.0 on cardbus0
	dc0: Ethernet address: 00:03:01:81:44:04
	miibus0: <MII bus> on dc0
	tdkphy0: <TDK 78Q2120 media interface> on miibus0
	tdkphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto