fb: Make PMON work without VGA

Disable output properly.

Signed-off-by: Jiaxun Yang <[email protected]>

fb/cfb_console.c

@@ -417,13 +417,19 @@ static void memcpyl (int *d, int *s, int c);
 
 extern int vga_available;
 
-static int disableoutput=0;
+static int disableoutput=1;
 void video_disableoutput(void)
 {
  disableoutput=1;
 }
 void video_enableoutput(void)
 {
+ if (!vga_available)
+ return;
+
+ if (!video_fb_address)
+ return;
+
  disableoutput=0;
 }
 void video_drawchars_xor (int xx, int yy, unsigned char *s, int count)
@@ -942,6 +948,9 @@ static void console_newline (void)
 
 void video_putc (const char c)
 {
+ if(disableoutput)
+ return;
+
  switch (c) {
  case 13: /* ignore */
  CURSOR_OFF
@@ -1715,6 +1724,8 @@ int fb_init (unsigned long fbbase,unsigned long iobase)
  memset (memfb, 0, CONSOLE_ROWS * CONSOLE_COLS);
  }
 #endif
+ video_enableoutput();
+
  return 0;
 }