"H. Peter Anvin" <[EMAIL PROTECTED]> writes: > Andrew Morton wrote: >> On Thu, 05 Oct 2006 00:13:12 -0600 >> [EMAIL PROTECTED] (Eric W. Biederman) wrote: >> >>> Do things work better if you don't specify a vga=xxx mode? >> yes, without vga=0x263 it boots. > > vga= actually patches a specific offset in the boot sector. We don't actually > have 512 bytes, we have some 500-ish bytes plus a small patch area at the end.
>From video.S It uses offset 0 in the boot sector. We have 497 bytes that can be used, before we call setup.S after that setup.S considers the entire bootsector it's own. /* Positions of various video parameters passed to the kernel */ /* (see also include/linux/tty.h) */ #define PARAM_CURSOR_POS 0x00 #define PARAM_VIDEO_PAGE 0x04 #define PARAM_VIDEO_MODE 0x06 #define PARAM_VIDEO_COLS 0x07 #define PARAM_VIDEO_EGA_BX 0x0a #define PARAM_VIDEO_LINES 0x0e #define PARAM_HAVE_VGA 0x0f #define PARAM_FONT_POINTS 0x10 #define PARAM_LFB_WIDTH 0x12 #define PARAM_LFB_HEIGHT 0x14 #define PARAM_LFB_DEPTH 0x16 #define PARAM_LFB_BASE 0x18 #define PARAM_LFB_SIZE 0x1c #define PARAM_LFB_LINELENGTH 0x24 #define PARAM_LFB_COLORS 0x26 #define PARAM_VESAPM_SEG 0x2e #define PARAM_VESAPM_OFF 0x30 #define PARAM_LFB_PAGES 0x32 #define PARAM_VESA_ATTRIB 0x34 #define PARAM_CAPABILITIES 0x36 Eric _______________________________________________ fastboot mailing list [email protected] https://lists.osdl.org/mailman/listinfo/fastboot
