Hi,
> I suspect you'd be better off getting the xencons to register as ttyS0
> (xencons=ttyS0) so that it doesn't go anywhere near the console, and
> compile in VT, VT_CONSOLE and DUMMY_CONSOLE.
Tried that, as well as disabling VGA_CONSOLE, but no improvements :-(:-(
however, when built as a module, it is somewhat easier to debug this
problem in fbcon, since dom1 is still running after it segfaults, and I can
still use dmesg to see the printk's (strange that they don't appear on the
console...).
>
> Please let us know how you get on.
Ok, here's what I found so far:
Using printk statements, I was able to find the culprit, it seems to be the
vc pointer which is not initialised properly.
Here's the piece of code (from fbcon_startup):
/* Setup default font */
if (!p->fontdata) {
if (!fontname[0] || !(font = find_font(fontname)))
font = get_default_font(info->var.xres,
info->var.yres);
DPRINTK("fbcon_startup: ca\n");
vc->vc_font.width = font->width;
vc->vc_font.height = font->height;
vc->vc_font.data = p->fontdata = font->data;
vc->vc_font.charcount = 256; /* FIXME Need to support more
fonts */
DPRINTK("fbcon_startup: cb\n");
}
And the oops occurs between the two DPRINTK's...
So I added a check at startup:
static const char *fbcon_startup(void)
{
const char *display_desc = "frame buffer device";
struct display *p = &fb_display[fg_console];
struct vc_data *vc = vc_cons[fg_console].d;
struct font_desc *font = NULL;
struct module *owner;
struct fb_info *info = NULL;
struct fbcon_ops *ops;
int rows, cols;
int irqres;
DPRINTK("fbcon_startup... fg_console: %d, vc: %d\n",fg_console,vc);
This prints 0 for the fg_console (not necessarely a problem) as well as vc...
which is defenately a problem since it is dereferenced later!
Seems like the vc_cons is not setup right, I'll have to take a look into vt.c
I guess.
Could this be due to the missing ps/2 port on domU (since they are assigned to
dom0)?
Will report back when I know more.
Regards,
Mark.
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