linux-kernel - Re: [patches] [PATCH] [21/22] x86_64: Extend bzImage protocol for relocatable bzImage

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Date:	Wed, 9 May 2007 17:55:02 -0700
From:	yhlu <yhlu.kernel@...il.com>
To:	"Gerd Hoffmann" <kraxel@...hat.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Jeremy Fitzhardinge" <jeremy@...p.org>, vgoyal@...ibm.com,
	"Jeff Garzik" <jeff@...zik.org>, patches@...-64.org,
	linux-kernel@...r.kernel.org,
	virtualization <virtualization@...ts.linux-foundation.org>,
	"Rusty Russell" <rusty@...tcorp.com.au>, "Andi Kleen" <ak@...e.de>,
	"Ingo Molnar" <mingo@...e.hu>
Subject: Re: [patches] [PATCH] [21/22] x86_64: Extend bzImage protocol for relocatable bzImage

On 5/9/07, Gerd Hoffmann <kraxel@...hat.com> wrote:
> Refine SCREEN_INFO sanity check for vgacon initialization.
>
> Checking video mode field only to see whenever SCREEN_INFO is
> initialized is not enougth, in some cases it is zero although
> a vga card is present.  Lets additionally check cols and lines.
>
> Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
> Cc: Rusty Russell <rusty@...tcorp.com.au>
> Cc: Andi Kleen <ak@...e.de>
> Cc: Alan <alan@...rguk.ukuu.org.uk>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Eric W. Biederman <ebiederm@...ssion.com>
> ---
>  drivers/video/console/vgacon.c |    9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
>
> Index: vanilla-2.6.21-git11/drivers/video/console/vgacon.c
> ===================================================================
> --- vanilla-2.6.21-git11.orig/drivers/video/console/vgacon.c
> +++ vanilla-2.6.21-git11/drivers/video/console/vgacon.c
> @@ -368,9 +368,14 @@ static const char *vgacon_startup(void)
>  #endif
>         }
>
> +       /* SCREEN_INFO initialized? */
> +       if ((ORIG_VIDEO_MODE  == 0) &&
> +           (ORIG_VIDEO_LINES == 0) &&
> +           (ORIG_VIDEO_COLS  == 0))
> +               goto no_vga;
> +
>         /* VGA16 modes are not handled by VGACON */
> -       if ((ORIG_VIDEO_MODE == 0x00) ||        /* SCREEN_INFO not initialized */
> -           (ORIG_VIDEO_MODE == 0x0D) ||        /* 320x200/4 */
> +       if ((ORIG_VIDEO_MODE == 0x0D) ||        /* 320x200/4 */
>             (ORIG_VIDEO_MODE == 0x0E) ||        /* 640x200/4 */
>             (ORIG_VIDEO_MODE == 0x10) ||        /* 640x350/4 */
>             (ORIG_VIDEO_MODE == 0x12) ||        /* 640x480/4 */
>
it works.

YH
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