Subject: Re: kern/19435 and uncached memory
To: None <firstname.lastname@example.org>
From: Izumi Tsutsui <email@example.com>
Date: 01/17/2003 20:24:01
In article <20030115024555.B5B83B0D2A@gabi-n.hauN.org>
> A workaround described in  is to disable cache of buffers.
> Do we have a standard way to allocate uncached memory on NetBSD?
In general, it _could_ be handled by bus_dmamem_map() API with
BUS_DMA_COHERENT flag if the architecture support it,
but I think there is no MI hook for each driver specific backend.
If you change bus_dmamem_map() on i386 with COHERENT flag
to map memory uncached, all other MI drivers are affected..
(If auich(4) only exists on i386, we could move auich driver
under sys/arch/i386/pci and could replace bus_dma tag for it?)