[syslinux] [PATCH] memdisk: adjust order of DPT values in mstructs.h
Kenneth J. Davis
jeremyd at fdos.org
Mon Oct 22 07:02:24 PDT 2012
This is a resubmission of my patch sent Jun 18, 2011 since it does not
seem it was accepted. Please let me know if I am doing something
wrong in how I am submitting this patch. Thank you.
The below patch will swap order of sectors/track with bytes/sector to
match diskette
parameter table order (as pointed to by INT 1Eh).
References: (additional ones available if necessary)
'System BIOS for IBM PC/XT/AT computers and compatibles' by Phoenix
Technologies Ltd. copyright 1987,88,89 3rd printing 1990 ISBN:
0-201-51806-6 pages 61-62
'PC Interrupts' 2nd edition by Ralf Brown & Jim Kyle copyright 1994
1st printing 1993 ISBN: 0-201-62485-0 page 211
Note: this fixes an issue with older FreeDOS kernels that expect this
structure to contain valid values.
Signed-off-by: Kenneth J. Davis <jeremyd at fdos.org>
diff --git a/memdisk/mstructs.h b/memdisk/mstructs.h
index fecbff4..0b0dc07 100644
--- a/memdisk/mstructs.h
+++ b/memdisk/mstructs.h
@@ -121,9 +121,9 @@ typedef union {
uint8_t specify1; /* "First specify byte" */
uint8_t specify2; /* "Second specify byte" */
uint8_t delay; /* Delay until motor turn off */
- uint8_t sectors; /* Sectors/track */
-
uint8_t bps; /* Bytes/sector (02h = 512) */
+
+ uint8_t sectors; /* Sectors/track */
uint8_t isgap; /* Length of intersector gap */
uint8_t dlen; /* Data length (0FFh) */
uint8_t fgap; /* Formatting gap */
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