On Mon, 26 Apr 1999 15:57:54 +0900 (JST) 
 nisimura@itc.aist-nara.ac.jp (Toru Nishimura) wrote:

 > >> To support the i860 properly, we need a TLB manager and the
 > >> right ucode for the damn thing.
 > >
 > > Special TLB management framework will be required ultimately to
 > > support the variety of devices found in Alpha/DECstations (think about
 > > R4000 and Alpha TLB)
 > 
 > NetBSD/mips common code leaves 6 entry of R3000 hard-wired TLBs for no
 > purpose.  These can over upto 24KB of memory region.  Are they useful
 > with your driver?

I think he means to manage the i860's TLB.  So, this is actually more like
what you need to do for SGMAP DMA on the Alpha.

        -- Jason R. Thorpe <thorpej@nas.nasa.gov>