steven.zhang wrote:
On Wed, 2008-05-07 at 10:36 +0200, Vladimir Pantelic wrote:
steven.zhang wrote:
So many thanks!Vladimir.
But why 720*480 succeeded?Its size is 2488320 byte, which exceeds 2M
already.
I have checked the CONSISTENT_DMA_SIZE of my arch.Its value is 14M, that
should be enough.
yes, I saw that after sending the mail
any other suggestion?
well, the kernel tries to find such a big contiguous piece of memory, maybe the
memory is already too fragmented at that time?
Yes, I think, we should not allocate frame buffer memory dynamic.Map a fix
memory area before kernel start?
I'm afraid so, yes. I've been trying to use dma_alloc_coherent()
dynamically, but it's not very flexible. Especially if you use it a lot
on memory blocks not sized 2^n, it's causing a lot of fragmentation by
itself. It's implemented using get_free_pages(), but this is only
allocating sized 2^n blocks of memory. So dma_alloc_coherent() allocates
the next bigger 2^n block and then free's the excess pages one by one.
That isn't really helping with keeping the memory pool in shape.
--
* Matthias Welwarsky
Project Manager Software
Germany
*
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