Patch: sym(4) "VTOBUS FAILED" panics on amd64, amd64/89550
janm at transactionware.com
Thu Sep 21 14:47:04 PDT 2006
I posted this to freebsd-amd64, but I've had no replies.
This fixes the sym "VTOBUS FAILED" panics that I got consistently on
6.1-RELEASE/amd64; see the PR amd64/89550 for dmesg, other reports, etc.
Quick summary: sym(4) assumes on amd64 that virtual addresses provided by
bus_dmamem_alloc() have the same alignment as the physical addresses (in
this case, 2*PAGE_SIZE). They don't, and stuff breaks. This patch works
I'm looking for someone to take a quick look at it and make sure that the
approach is reasonable. I would be nice if a fix was committed (not
sym(4) is listed as supported in the 6.1/amd64 hardware guide, but it
doesn't seem to be working at all. For 6.2, I either suggest putting in a
fix so that it is supported, or having a note in the hardware guide.
Sorry about coming along so late in the release cycle, but I first
encountered the problem on Monday.
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