steven.zhang wrote:
Hi, all.
I am working on Frame buffer driver to support for HD output.
Take 720p resolution as example:
it will need up to 1280*720*16/8 * 3 (5M) memory to buffer.
using dma_alloc_coherent() to allocate 5M memory will fail,
thus, I try to reserve the FB buffer on system boot.What I do is just
pass a fix physical address such as 0xF000000 to mem_alloc(), then
nothing changed except that set u-boot to mem=120M.
But nothing output when kernel is up.I don't know where is wrong.
does this fixed allocation work with your SD fb? now you are trying two things
at the same time, I would verify first that your fixed allocation works with the
SD fb, the go HD.
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