[coreboot] [libpayload] [PATCH] fix garbage on screen with Geode-LX VGA

[Jens Rottmann]

libpayload: fix garbage on screen with Geode-LX VGA

Clear initial garbage in VGA memory and fix scroll_up, which scrolled 1 scanline
instead of 1 text line by mistake.

Signed-off-by: Jens Rottmann 
---

--- payloads/libpayload/drivers/video/geodelx.c	(revision 5697)
+++ payloads/libpayload/drivers/video/geodelx.c	(working copy)
@@ -206,7 +206,7 @@ static void geodelx_set_palette(int entr
 static void geodelx_scroll_up(void)
 {
    unsigned char *dst = FB;
-	unsigned char *src = FB + vga_mode.hactive;
+	unsigned char *src = FB + FONT_HEIGHT * vga_mode.hactive;
    int y;

for(y = 0; y < vga_mode.vactive - FONT_HEIGHT; y++) {
@@ -216,8 +216,6 @@ static void geodelx_scroll_up(void)
    	src += vga_mode.hactive;
    }

-	dst = FB + (vga_mode.vactive - FONT_HEIGHT) * vga_mode.hactive;
-
    for(; y < vga_mode.vactive; y++) {
    	memset(dst, 0, vga_mode.hactive);
    	dst += vga_mode.hactive;
@@ -280,6 +278,8 @@ static int geodelx_init(void)
    	geodelx_set_palette(i, vga_colors[i]);
    }

+	geodelx_clear();
+
    return 0;
 }

_