No root filesystem

John Baldwin jhb at
Fri Aug 29 14:50:15 UTC 2008

On Friday 29 August 2008 03:36:46 am Pascal Hofstee wrote:
> On Sat, Aug 23, 2008 at 4:56 PM, John Baldwin <jhb at> wrote:
> > Does 'acpidump -t' show a MCFG table?  Also, can you get the output
> > of 'devinfo -r' (with working kernel).
> Btw ... i posted a full verbose bootlog from the missing kernel in the
> other thread
> perhaps that might be useful in resolving this issue. See below:

So the reports I've seen of this all involve the Nvidia MCP55 ATA chipset, and 
only the ata controller loses its marbles (so to speak).  Christian ran a 
patch that tested each PCI config read and they always returned the same 
value from both methods.  I think that this may be a weird bug in the ata 
driver itself.  It might be helpful to add printfs to instrument the various 
nvidia-specific ATA routines in sys/dev/ata/ata_chipset.c to compare the old 
and new kernels.

John Baldwin

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