diskboot: correct the patching of the floppy table

The floppy table patching was somehow messed up when converting to
GPT.  The proper offset of FloppyTable at the point we patch is
[di-12] and we use offset +4 inside that field.

Reported-by: Juergen <jlborries@online.de>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

diff --git a/core/diskboot.inc b/core/diskboot.inc
index 574db45..7c02066 100644 (file)
--- a/core/diskboot.inc
+++ b/core/diskboot.inc
@@ -162,7 +162,7 @@ floppy:
                mov [bx+2],ax           ; Segment 0
                fs rep movsw            ; Faster to move words
                mov cl,[bsSecPerTrack]  ; Patch the sector count
-               mov [di-76+8],cl
+               mov [di-12+4],cl
 
                push ax                 ; Partition offset == 0
                push ax