On Sun, Mar 11, 2018 at 11:24:38PM +0000, Ian Armstrong wrote: > On Sat, 10 Mar 2018 16:57:41 +0000 > "French, Nicholas A." <n...@ou.edu> wrote: > > > > > No what if the framebuffer driver is just requested as a > > > > secondary step after firmware loading? > > > > > > Its a possibility. The decoder firmware gets loaded at the > > > beginning of the decoder memory range and we know its length, so > > > its possible to ioremap_nocache enough room for the firmware only > > > on init and then ioremap the remaining non-firmware decoder memory > > > areas appropriately after the firmware load succeeds... > > > > I looked in more detail, and this would be "hard" due to the way the > > rest of the decoder offsets are determined by either making firmware > > calls or scanning the decoder memory range for magic bytes and other > > mess. > > The buffers used for yuv output are fixed. They are located both before > and after the framebuffer. Their offset is fixed at 'base_addr + > IVTV_DECODER_OFFSET + yuv_offset[]'. The yuv offsets can be found in > 'ivtv-yuv.c'. The buffers are 622080 bytes in length. > > The range would be from 'base_addr + 0x01000000 + 0x00029000' to > 'base_addr + 0x01000000 + 0x00748200 + 0x97dff'. This is larger than > required, but will catch the framebuffer and should not cause any > problems. If you wanted to render direct to the yuv buffers, you would > probably want this region included anyway (not that the current driver > supports that).
Am I correct that you are talking about the possibility of re-ioremap()-ing the 'yuv-fb-yuv' area *after* loading the firmware, not of mapping ranges correctly on the first go-around? Because unless my math is letting me down, the decoder firmware is already loaded from 'base_addr + 0x01000000 + 0x0' to 'base_addr + 0x01000000 + 0x3ffff' which overlaps the beginning of the yuv range. - Nick
