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Re: constraints on rbus_min_start?
On Mon, 07 Jan 2008 21:39:53 -0500
Greg Troxel <gdt%ir.bbn.com@localhost> wrote:
> I am confused about the rbus area. On some machines (Thinkpad 600E),
> rbus_min_start has to be 512 MB, and this seems to have something to
> do with the processor not addressing > 1GB.
> I have been under the impression that the PCI memory space was in
> physical addresses, and that rbus_min_start was in virtual. But I
> have never really been clear on this.
> When I tried a compact flash disk, I was told "card appears to have
> bogus CIS". It behaves just fine on an i386.
> I think this is different from "bad rbus_min_start". On my T60,
> cardbus cards work fine with rbus_min_start auto-sized to 2 GB (2 GB
> ram in it), even one of those pesky EVDO cards, vz and sprint. But
> pcmcia cards lose with a similar message to yours.
I don't think I have any other PCMCIA or Cardbus cards around. But
I've been using the CF card for years on a T42, without any problems.
As I said, I took the same card+slot adapter and inserted it into the
T42 immediately after the amd64 failure on my T61. Maybe it's a
--Steve Bellovin, http://www.cs.columbia.edu/~smb
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