cardbus memory allocation problem

[Michael Butler]

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> I have WIP patches to fix this but they aren't ready yet.
>  
>> pcib4:   I/O decode        0x4000-0x4fff
>> pcib4:   memory decode     0xf0900000-0xf09fffff
>>  *** this memory widow is what I expected all children to allocate from
>>
>> pcib4:   no prefetched decode
>> pcib4:   Subtractively decoded bridge.
> 
> It's a subtractive bridge, so the resources do not have to be allocated from 
> the window.  That said, I'm committing the last of my patches to HEAD today to 
> rework how PCI-PCI bridges handle I/O windows to support growing windows, etc. 
> and the new PCI-PCI bridge driver will attempt to grow the memory window to 
> allocate a new range before falling back to depending on the subtractive 
> decode.

You might be pleased to hear that, without any "special arrangements" in
loader.conf, the new PCI-PCI code does The Right Thing with memory
allocation :-)

Parent bridge:

I "fixed" the subordinate bus using "setpci -s 07:06.2 4c.b=02"

00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2)
(prog-if 01 [Subtractive decode])
        Flags: bus master, fast devsel, latency 0
        Bus: primary=00, secondary=07, subordinate=09, sec-latency=64
        I/O behind bridge: 00004000-00004fff
        Memory behind bridge: f0900000-f09fffff

Cardbus bridge:

07:06.0 CardBus bridge: Texas Instruments PCIxx12 Cardbus Controller
        Subsystem: Toshiba America Info Systems Device ff10
        Flags: bus master, medium devsel, latency 64, IRQ 18
        Memory at f0907000 (32-bit, non-prefetchable)
        Bus: primary=07, secondary=08, subordinate=09, sec-latency=32
        16-bit legacy interface ports at 0001

 [ .. snip .. ]

Cardbus inserted ..

08:00.0 Ethernet controller: Atheros Communications Inc. Atheros
AR5001X+ Wireless Network Adapter (rev 01)
        Subsystem: Netgear WG511T 108 Mbps Wireless PC Card (rev.A/B)
        Flags: medium devsel, IRQ 18
        Memory at f0910000 (32-bit, non-prefetchable)
        Capabilities: [44] Power Management version 2
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