Uttered Pierre Ossman <drzeus-list@drzeus.cx>, spake thus:

> I've been trying to figure out how other drivers do it but I can't see 
> what I'm missing. And the documentation doesn't cover ISA DMA.

Allocate your DMA buffer area by OR'ing in the "GFP_DMA" flag.  This
keeps your DMA buffer below the magical 16MB limit.  Also be sure to
use "virt_to_bus()" to convert the kernel buffer address into one
that you can give to the DMA engine.

HTH.