Hello,
vga= is a special parameter that needs to be handled by bootloader so
that the kernel can get it before parsing its command line.
The small attached patch add support for it.
Index: hw/pc.c
===================================================================
RCS file: /sources/qemu/qemu/hw/pc.c,v
retrieving revision 1.70
diff -u -r1.70 pc.c
--- hw/pc.c 8 Feb 2007 23:09:59 -0000 1.70
+++ hw/pc.c 16 Feb 2007 18:45:10 -0000
@@ -567,6 +567,7 @@
if (linux_boot) {
uint8_t bootsect[512];
uint8_t old_bootsect[512];
+ char *vmode;
if (bs_table[0] == NULL) {
fprintf(stderr, "A disk image must be given for 'hda' when booting a Linux kernel\n");
@@ -618,6 +619,25 @@
KERNEL_CMDLINE_ADDR - KERNEL_PARAMS_ADDR);
/* loader type */
stw_raw(phys_ram_base + KERNEL_PARAMS_ADDR + 0x210, 0x01);
+
+ /* handle vga= parameter */
+ vmode = strstr(kernel_cmdline, "vga=");
+ if (vmode) {
+ char *space;
+ unsigned int video_mode;
+ /* skip "vga=" */
+ vmode += 4;
+ if (!strncmp(vmode, "normal", 6)) {
+ video_mode = 0xffff;
+ } else if (!strncmp(vmode, "ext", 3)) {
+ video_mode = 0xfffe;
+ } else if (!strncmp(vmode, "ask", 3)) {
+ video_mode = 0xfffd;
+ } else {
+ video_mode = strtol(vmode, NULL, 0);
+ }
+ stw_raw(phys_ram_base + KERNEL_PARAMS_ADDR + 0x1fa, video_mode);
+ }
}
if (pci_enabled) {
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