It seems the Xbox (hacked) firmware, Cromwell, sets up a vesa-like framebuffer with predefined 640x480x32 RGBX settings at addr *(0xfd600800) [1]
I just gave a quick look at vbe.c to see how hard would it be to adapt it to use default settings rather than BIOS calls. Can someone provide a bit of advice on what those settings would be? In particular, I wonder about: `mode' (as returned by grub_vbe_get_video_mode_info()) `active_mode_info.memory_model' (and in case of GRUB_VBE_MEMORY_MODEL_PACKED_PIXEL, do we have to setup vga palette?) `framebuffer.bytes_per_scan_line' `framebuffer.bytes_per_pixel' --> 4, right? Anything else I could have missed ? Also, is there an easy way to get debugging output printed somewhere (before we have to care about font stuff) in the form of raw pixels ? This thing doesn't seem to have a serial port or any other simple debugging interface. [1] from http://www.xbox-linux.org/wiki/Porting_an_Operating_System_to_the_Xbox_HOWTO#Video_Driver -- Robert Millan <GPLv2> I know my rights; I want my phone call! <DRM> What use is a phone call, if you are unable to speak? (as seen on /.) _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org http://lists.gnu.org/mailman/listinfo/grub-devel
