On 2014-01-09 10:08, Hiremath, Vaibhav wrote: > No, that's what is causing issue to me. Can you try predefined address flow? > Just to highlight, I get UNDERFLOW during boot itself, immediately when it gets mapped to userspace. > > Boot LOG: > > [ 4.822549] Freeing unused kernel memory: 440K (c0919000 - c0987000) > [ 5.276615] OMAPFB: pan_display(0) > [ 5.276625] OMAPFB: setcmap > [ 5.276635] OMAPFB: setcmap > [ 5.293518] OMAPFB: user mmap region start a0000000, len 1536000, off 0 > [ 5.300171] omapdss APPLY error: FIFO UNDERFLOW on gfx, disabling the overlay Hmm that's interesting... So you have some tool that's ran early, which draws something on the screen? Or maybe that's X starting? Ah... I think I understand now. As I mentioned, AM4x has issues already. I think the CPU/others can block DSS when accessing memory. So, if we have bad caching for the mapped framebuffer, the CPU will use more bandwidth when reading/writing to it, and that will cause DSS to underflow. Tomi
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