From fcac6ea74d4ab3e7f489e2e798c590a59238d2cc Mon Sep 17 00:00:00 2001
From: "Ronald G. Minnich" <rminnich@gmail.com>
Date: Tue, 13 May 2003 13:13:51 +0000
Subject: [PATCH] fix for SMA sizing.

---
 src/northbridge/via/vt8601/northbridge.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/src/northbridge/via/vt8601/northbridge.c b/src/northbridge/via/vt8601/northbridge.c
index b654e68b20..6e0fb6ce44 100644
--- a/src/northbridge/via/vt8601/northbridge.c
+++ b/src/northbridge/via/vt8601/northbridge.c
@@ -19,13 +19,25 @@ static unsigned long __sizeram(void)
 
 	if (! pcidev)
 		return 0;
-
+	
+	// Documentation on VT8601 - Pg 51 Rev 1.3 Sept 1999 says
+	// Device 0 Offset FB - Frame buffer control
+	// bit
+	//  7  VGA Enable (0 disable, 1 enable)
+	//  6  VGA Reset (write 1 to reset)
+	// 5-4 Frame Buffer size
+	//      00 None (default)
+	//      01 2M
+	//      10 4M
+	//      11 8M
+	//  3  CPU Direct Access Frame Buffer (0 disable, 1 enable)
+	// 2-0 CPU Direct Access Frame Buffer Base Adddress <31:29>
 	pci_read_config_byte(pcidev, 0xfb, &sma_status);
 	sma_size_bits = (sma_status >> 4) & 0x03;
-	if (sma_size_bits > 3)
-		sma_size = 0;
-	else
+	if (sma_size_bits > 0)
 		sma_size = 0x01 << sma_size_bits;
+	else
+		sma_size = 0;
 
 	for(totalmem = mem = prevmem = 0, bank = firstbank; 
 	    bank <= lastbank; bank++) {