Hi, list,
I have a problem after moving the bootsplash patch into the domain 0
kernel. It doesn''t work.
After digging the source code, I found that the kernel data "struct
screen_info screen_info" is set to a specific value in
arch/i386/kernel/setup-xen.c. And the info->video_type is
XEN_VGATYPE_TEXT_MODE_3, so it doesn''t support framebuffer in domain 0
and the bootsplash either.
void __init setup_arch(char **cmdline_p)
{
...
if (is_initial_xendomain()) {
/* This is drawn from a dump from vgacon:startup in
* standard Linux. */
screen_info.orig_video_mode = 3;
screen_info.orig_video_isVGA = 1;
screen_info.orig_video_lines = 25;
screen_info.orig_video_cols = 80;
screen_info.orig_video_ega_bx = 3;
screen_info.orig_video_points = 16;
screen_info.orig_y = screen_info.orig_video_lines - 1;
if (xen_start_info->console.dom0.info_size >
sizeof(struct dom0_vga_console_info)) {
//const struct dom0_vga_console_info *info
struct dom0_vga_console_info *info (struct
dom0_vga_console_info *)(
(char *)xen_start_info +
xen_start_info->console.dom0.info_off);
// wangqiang
//info->video_type = XEN_VGATYPE_VESA_LFB;
dom0_init_screen_info(info);
}
xen_start_info->console.domU.mfn = 0;
xen_start_info->console.domU.evtchn = 0;
} else
screen_info.orig_video_isVGA = 0;
...
}
it seems that the initial dom0_vga_console_info is set by
fill_console_start_info() in xen/drivers/video/vga.c
My question is that is there a particular reason to assign the
dom0_vga_console_info a specific value?
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Keir Fraser
2007-Mar-08 08:17 UTC
Re: [Xen-devel] about framebuffer support in xen domain 0
On 8/3/07 08:09, "qiang.wang" <qiang.wang@cs2c.com.cn> wrote:> it seems that the initial dom0_vga_console_info is set by > fill_console_start_info() in xen/drivers/video/vga.c > My question is that is there a particular reason to assign the > dom0_vga_console_info a specific value?Yeah, you¹re pretty much stuck in the mode that Xen sets up for you, at least for now. All the early video setup code needs to run in real mode. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel