From 42fc925ec0df2cb8d924bec1c9fb782c12bd8364 Mon Sep 17 00:00:00 2001
From: bellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Mon, 25 Sep 2006 21:41:20 +0000
Subject: [PATCH] VBE 4 bit bank selection fix (Volker Rupper)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2181 c046a42c-6fe2-441c-8c8c-71466251a162
---
 hw/vga.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/hw/vga.c b/hw/vga.c
index 0609f84..5acacf9 100644
--- a/hw/vga.c
+++ b/hw/vga.c
@@ -447,7 +447,11 @@ static void vbe_ioport_write_data(void *opaque, uint32_t addr, uint32_t val)
             }
             break;
         case VBE_DISPI_INDEX_BANK:
-            val &= s->vbe_bank_mask;
+            if (s->vbe_regs[VBE_DISPI_INDEX_BPP] == 4) {
+              val &= (s->vbe_bank_mask >> 2);
+            } else {
+              val &= s->vbe_bank_mask;
+            }
             s->vbe_regs[s->vbe_index] = val;
             s->bank_offset = (val << 16);
             break;
-- 
2.7.4