Hi Ranga, On 03.01.19 09:24, galla rao wrote: > Video Mode in Coreboot > > *CorebootLog* > coreboot video frame buffer information > physical_address: 0xC0000000 > *x_resolution: 0x400* > *y_resolution: 0x300*
0x400 x 0x300 is exactly 1024x768. > bits_per_pixel: 0x20 > bytes_per_line: 0x1000 > red_mask_size: 0x8 > red_mask_pos: 0x10 > > GOP UEFI driver (Tiano payload) is expected to report 4 modes > GOP should report MaxMode 4 *0: > 1600x900 BGRReserved Pixels 1600 1: > 640x480 BGRReserved Pixels 640 2: > 800x600 BGRReserved Pixels 800 3: > 1024x768 BGRReserved Pixels 1024 Unlike legacy firmware, coreboot doesn't stay active after handing execution over to its payload. So there is no coreboot code that could change to a different mode afterwards. If you have to switch modes in Tianocore, you should disable the coreboot framebuffer and add a GOP driver to Tianocore instead. With open-source graphics init, you could also set a fixed mode in coreboot. Alas, there is no open-source solution for Bay Trail that I know of. Though, existing solutions (e.g. libgfxinit) for other Intel platforms could be extended for Bay Trail (and could also be used to write an open-source GOP driver). Nico _______________________________________________ coreboot mailing list -- coreboot@coreboot.org To unsubscribe send an email to coreboot-le...@coreboot.org
