Subject: Re: FreeBSD Bus DMA (was Re: AdvanSys board support)
To: Jason Thorpe <>
From: Matthew Jacob <>
List: tech-kern
Date: 06/11/1998 17:33:23
>  Noriyuki Soda <> wrote:
>  > About bus_dmamap_callback_t, I think that reducing bounce memory size
>  > is certainly good thing. But it is pain if we must use callback in all
>  > cases.  (Think about hardware_scb in ahc driver.)

Yes, I found this to be problematic when I did the FreeBSD/CAM
version of the ISP driver. Personally, I don't see it as being
that difficult to take a flag in the alloc case that says
"alloc now or return failure", but I'll leave that up to Justin
to decide (I coped).