dma

[AlexHully]

Ok, those were recent?



-- 
Alex


08.11.2015, 12:56, "Hans Petter Selasky" <hps at selasky.org>:
> On 11/08/15 11:22, AlexHully wrote:
>>  Hi,
>>
>>  I would like a clarification for dma.
>>
>>  The context: most dma capable devices have 32 bits address range.
>>  Is it correct that, if there was no 3G/1G mapping in the kernel, or that kernel low memory could map 4Gb memory, one could choose any free addresses in that low memory to set up a dma buffer?
>>
>>  That would avoid all the mapping hassle, and performance cost associated.
>
> I've seen USB controllers only supporting 2G address range.
>
> --HPS