hello Ranga,
what method and setting do you have selected for graphics init? 400x300 would indicate that coreboot is initializing the display in VGA text mode, rather than a VESA framebuffer mode - you likely need to change this in Kconfig. The Tianocore coreboot framebuffer GOP driver can only reuse whatever framebuffer coreboot has set up, so there will only ever be one option available. Assuming you are running a VGA Option ROM, you're going to be limited to VGA text mode or 640x480, 800x600, 1024x768, or 1280x1024 (at various bit depths). 1600x900 isn't going to be available, I don't believe.
cheers, Matt
On Thu, Jan 3, 2019 at 2:25 AM galla rao galla.rao80@gmail.com wrote:
Video Mode in Coreboot
CorebootLog coreboot video frame buffer information physical_address: 0xC0000000 x_resolution: 0x400 y_resolution: 0x300 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
In BayTrail Platform i only see 1 single mode which is 400 * 300
what changes are expected from GOP/VBIOS to set one of the 4 graphics mode Please advise!
Best Regards Ranga _______________________________________________ coreboot mailing list -- coreboot@coreboot.org To unsubscribe send an email to coreboot-leave@coreboot.org