From 4b2a42963f8af63d7f5e35699eb458c1af85aa2f Mon Sep 17 00:00:00 2001
From: Brian Palmer <brianp@sginet.com>
Date: Thu, 12 May 2005 02:57:13 +0000
Subject: [PATCH] Support getting the boot drive from the BIOS or the value in
 the BPB.

svn path=/trunk/; revision=15233
---
 reactos/boot/freeldr/bootsect/fat.asm | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/reactos/boot/freeldr/bootsect/fat.asm b/reactos/boot/freeldr/bootsect/fat.asm
index 36e7091df64..79aac6a5dec 100644
--- a/reactos/boot/freeldr/bootsect/fat.asm
+++ b/reactos/boot/freeldr/bootsect/fat.asm
@@ -73,7 +73,7 @@ SectorsPerTrack dw 18
 NumberOfHeads   dw 2
 HiddenSectors   dd 0
 TotalSectorsBig dd 0
-BootDrive       db 0
+BootDrive       db 0xff
 Reserved        db 0
 ExtendSig       db 29h
 SerialNumber    dd 00000000h
@@ -89,6 +89,9 @@ main:
         mov es,ax								; Make ES correct
 
 
+		cmp BYTE [BYTE bp+BootDrive],BYTE 0xff	; If they have specified a boot drive then use it
+		jne GetDriveParameters
+
         mov [BYTE bp+BootDrive],dl				; Save the boot drive