Subject: Re: FreeBSD Bus DMA (was Re: AdvanSys board support)
To: Matthew Jacob <>
From: Justin T. Gibbs <>
List: tech-kern
Date: 06/11/1998 22:26:37
>>  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).

Where do you return the dm_seg data and in what space do you allocate it?