[Forum] Try only to realise the truth | ANN.lu |
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Try only to realise the truth : Comment 291 of 335 | ANN.lu |
Posted by Johan Rönnblom on 06-Jul-2004 18:12 GMT | In reply to Comment 290 (Don Cox): Don Cox wrote:
> What's the granularity in a PPC?
The pages are for every 4kb, which is why you don't want to mess with
the settings for these too often. The data for this is stored in
normal ram of course.
Then there are Batch Array Tables, BATs, which is what Ben H talked
about in the quote above. These allow to set up MMU/cache options for
a range between 128KB and 256MB.
I don't know what would be the least costly way to solve this problem
on the PPC, but it's quite obvious that the penalty is rather heavy -
although I guess it might be possible to achieve better results than
by not using DMA at all. Maybe we'll see. |
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