[U-Boot] Bug in cfb_console driver

Pali Rohár pali.rohar at gmail.com
Sun Mar 4 22:12:20 CET 2012

On Saturday 14 January 2012 04:32:04 Pali Rohár wrote:
> Hello,
> commit 03d31fcf4c37d90a00e66f06b38742960139f090 break video framebuffer
> output on Nokia N900. After this commit is video output garbaged and not
> readable on display. Problem is in function video_invertchar() - when I
> commented it, video output is OK, but without cursor. Problem is only on
> real N900 device, not in qemu.

This is simple preview how to fix output on N900 display:

diff --git a/drivers/video/cfb_console.c b/drivers/video/cfb_console.c
index eb013b8..7cd3cc5 100644
--- a/drivers/video/cfb_console.c
+++ b/drivers/video/cfb_console.c
@@ -624,6 +624,7 @@ static void video_set_cursor(void)
 static void video_invertchar(int xx, int yy)
+	/* Disabled on RX51
 	int firstx = xx * VIDEO_PIXEL_SIZE;
 	int lastx = (xx + VIDEO_FONT_WIDTH) * VIDEO_PIXEL_SIZE;
 	int firsty = yy * VIDEO_LINE_LEN;
@@ -635,6 +636,7 @@ static void video_invertchar(int xx, int yy)
 			*dest = ~*dest;
+	*/
 void console_cursor(int state)

But I think that function video_invertchar which is needed for rendering cursor should be fixed properly.

Can somebody check if current implementaion of function video_invertchar is correct? I do not properly understand that code, so I cannot debug it.

Pali Rohár
pali.rohar at gmail.com
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