So I reverted dma.[ch] in 1.5R to 1.5 release's versions, and made a change
to asc.c setting bufsiz to "64 * 1024" instead of "63 * 1024".  This fixed
the "data overrun" panics I was getting, and I can now perform sustained
scsi read/writes.  So I ran fdisk to create a small dos partition and a
big netbsd partition.  I disklabel'd same, and newfs'd all the bsd slices.
However, if I try to mount any of them (e.g. to /mnt), I panic with the
following...

panic: getblk: block size invariant failed                                      
Stopped in pid 25 (mount_ffs) at        0x802dd1a0:     jr      ra              
                bdslot: nop                                                     
db> 

For what it's worth, I can mount the dos filesystem just fine!
What's the deal?

-Mark