Hi, I have a couple of questions regarding the memory management for the new display subsystem. The new DSS allocates memory with dma_alloc_writecombine() and mmaps it to user space with dma_mmap_writecombine(). Allocation is done when omapfb starts up. Normally memory gets very quickly too fragmented for dma_alloc_writecombine() to work, but setting CONFIG_FB_OMAP_CONSISTENT_DMA_SIZE helps this. However, even when CONFIG_FB_OMAP_CONSISTENT_DMA_SIZE is set to 14, I am, for some reason, not able to allocate 1280x1024x4 (~5.2M) framebuffer. Could the consistent DMA area be already too fragmented, or is there some size limit there? There's also support to allocate fb memory in very early phase with reserve_bootmem(), which needs a predefined physical address and size that can come from the bootloader. I've been looking at the old DSS to see how this memory should be mapped, but I haven't been able to get it to work. It looks like the DSS DMA and the user space have a bit different view of the memory, so my assumption is that there's some caching or similar being done. So how to setup the memory gotten from reserve_bootmem() (or alloc_bootmem()) so that it would work the same way as dma_alloc_writecombine()'s memory? And generally: any other ideas how to improve the memory management of the DSS? Tomi -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
