I hope this is a sensible question, but here goes... PXA270 CPUs have integrated graphics hardware which is basically a dumb framebuffer, but it has 256KiB of SRAM which in theory can be used as a graphics buffer. The current pxafb driver just uses the (slow) system RAM and takes a lot of the bus bandwidth just to keep the LCD refreshed. I've previously tried to use this SRAM to map part of the framebuffer in the pxafb driver, but the management of the DMA memory allocation etc from the SRAM has always been a big problem. Would an approach of using TTM or GEM along with a modesetting DRM driver make it possible to write an "accelerated" driver for this hardware? Perhaps even utililize the SRAM to render tiles using SIMD optimized code and blit them to the framebuffer? Does anybody have any idea what might be possible if anything?
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