<clementp[m]>
"can't we do that from the kernel directly by using a memory region that always fault with a fault handler like Framebuffer's deferred_io is doing"
<clementp[m]>
It was a suggestion :)
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<jo0nas>
psycologically, asking a negative question has the effect of shifting the burden: when asked "can you do this?" it easier to dismiss as just a proposal, but "why don't you do this?" is uncomfortable to dismiss without strongly defending a rejection of what is implied as being the obvious best thing to do
<jo0nas>
MoeIcenowy, clementp[m], mripard: ^
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<mripard>
this was not really meant as a suggestion really, but more like a lead worth exploring, and if it's dumb/infeasible then we could discuss alternatives
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<mripard>
but in no way final
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<rz>
Does anyone know why on A13 (sun5i) when booted 3.4 kernel from emmc (sdc2) both DDMA and NDMA stop working, their shadow registers disappear (not mapped). When booted from mmc (sdc0) everything works fine. Mainline kernel boots and works well from both media, but I cannot use it because of Cedar.
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<diego71>
rz: recent mainline kernel should support video acceleration
<rz>
diego71: it does for decoding, but we need encoding as well
* rz
would happily switch to mainline if video enc could be possible
<mru>
what's more effort, adding encoding support to mainline or getting that ancient horror to work?
<jo0nas>
:-)
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<rz>
I managed ot six the DMA issue
<rz>
if someone is interested, proprietary DMA driver in 3.4-sunxi never initializes its clock, so DMA does not work in some booting schemes (like when booting from eMMC)
<rz>
the fix is simple: in file arch/arm/plat-sunxi/dma.c, in function sw_dma_init() somehting like below should be put: