video: Check for valid FB pointer before clearing

This command will start erasing at memory address zero
if there is not a valid framebuffer address that was found
during video_init().

This is a common case with Chrome OS devices in normal mode
when we do not execute the video option rom in coreboot.

Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/video/cfb_console.c b/drivers/video/cfb_console.c
index 9388859..26f673a 100644 (file)
--- a/drivers/video/cfb_console.c
+++ b/drivers/video/cfb_console.c
@@ -2293,6 +2293,8 @@ int video_get_screen_columns(void)
 
 void video_clear(void)
 {
+       if (!video_fb_address)
+               return;
 #ifdef VIDEO_HW_RECTFILL
        video_hw_rectfill(VIDEO_PIXEL_SIZE,     /* bytes per pixel */
                          0,                    /* dest pos x */