Messages in this thread | | | From | (Linus Torvalds) | Subject | Re: [BUG] PCMCIA CardBus problems | Date | 19 Jul 2000 18:14:10 -0700 |
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In article <20000719154955.U21194@valinux.com>, David Hinds <dhinds@valinux.com> wrote: >I think the problem is that the CardBus bridge setup code in 2.4 only >allocates 256 bytes of IO space, total, per socket, and this card >requires two 256-byte IO windows, one for each device. So the >allocation for resource 0 for the second device (the modem) fails. > >I tried poking around to figure out where this is set but I couldn't >find it. Martin probably knows exactly where to look. > >Hmmm. Actually, now that I think about it, maybe this is not so easy >as bumping a limit up from 0x100 to 0x200. The IO port allocation >code in 2.4 assumes that the only safe IO port regions for PCI devices >are 0x400-0x4ff, 0x800-0x8ff, 0xa00-0x8ff, etc. A card like this that >needs >256 ports will need to have them split up into non-contiguous >pieces. However, the resource manager expects a PCI bus to have a >single parent IO resource that can get cut up in any arbitrary way.
Hmm.. The 256-byte limitation was something I was wondering about: there's really not all that strong a reason for it these days, and I _think_ a PCI decode should override a old-time ISA decode anyway.
So we might change the 256-byte check into a warning rather than an error.. Martin?
Linus
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