fbdev: Ignore VESA modes if framebuffer is disabled

If the option vga=<VESA graphics mode> is added to the boot parameter, it will activate graphics mode, but without any framebuffer support, the user is left with an unusable display.

Change the behavior such that the user is instead prompted for another mode (ala vga=ask).

NOTE: People can always use vbetool to set a graphics mode if this is really desired, but the number of people doing this approaches zero.

---

 arch/i386/boot/video.S   |    4 +++-
 arch/x86_64/boot/video.S |    4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

index 9101969..78573da 100644
@@ -496,9 +496,11 @@ mode_set:
 	cmpb	$VIDEO_FIRST_V7>>8, %ah
 	jz	setv7
 	
+#ifdef CONFIG_FB
 	cmpb	$VIDEO_FIRST_VESA>>8, %ah
 	jnc	check_vesa
-	
+#endif
+		
 	orb	%ah, %ah
 	jz	setmenu
 	

index 6af75a7..d58aa0b 100644
@@ -496,9 +496,11 @@ mode_set:
 	cmpb	$VIDEO_FIRST_V7>>8, %ah
 	jz	setv7
 	
+#ifdef CONFIG_FB
 	cmpb	$VIDEO_FIRST_VESA>>8, %ah
 	jnc	check_vesa
-	
+#endif
+		
 	orb	%ah, %ah
 	jz	setmenu
 	

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