5.4-RELEASE amd64: Panic isadma_start : bad bounce buffer

Doug White dwhite at gumbysoft.com
Sat May 14 07:56:36 PDT 2005

On Sat, 14 May 2005, Steven Hartland wrote:

> Just been trying to install FreeBSD 5.4 amd64 here and
> when loading the raid control kernel module driver ( hptmv )
> from floppy and booting I was getting:
> Panic isadma_start : bad bounce buffer

This is a known bug; floppy drives don't work on amd64 since the ISA DMA
buffer gets allocated above 16MB.  I don't know if this is something that
needs to be handled by busdma.

Doug White                    |  FreeBSD: The Power to Serve
dwhite at gumbysoft.com          |  www.FreeBSD.org

More information about the freebsd-stable mailing list