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Bump boot block revision to 1.9 by a dummy edit on disk.c and:

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>From: bde@kralizec.zeta.org.au (Bruce Evans)
Subject: cache botch in bootstrap
Date: Sun, 20 Feb 94 18:14:35 +1100
The cache in the bootstrap loader didn't allow for the device changing.

This caused surprisingly little trouble - the cache is only for a single
track (or part of a track), and the first access to a new device is
always for an early sector, so there is no problem unless the last access
to the old device was for an early sector.  I saw the problem on a system
with BSD on wd1 and no label on wd0.  Everything worked if the the device
name wd(1,a) was specified before the default of wd(0,a) was tried, but
when the default was tried, it failed on the first sector because there
was no label, and then the first sector on wd0 was always used instead
of the first sector on wd1, so there was apparently no label on wd1
either.

Bruce
This commit is contained in:
Rodney W. Grimes 1994-02-22 22:59:40 +00:00
parent 97687d1b3d
commit 9ad564373e
4 changed files with 12 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
sys/i386/boot/biosboot/boot.c
View File

@ -24,7 +24,7 @@
* the rights to redistribute these changes.
*
* from: Mach, [92/04/03 16:51:14 rvb]
* $Id: boot.c,v 1.7 1993/10/15 12:33:03 rgrimes Exp $
* $Id: boot.c,v 1.8 1993/10/16 19:11:31 rgrimes Exp $
*/
@ -76,7 +76,7 @@ int drive;
ouraddr,
argv[7] = memsize(0),
argv[8] = memsize(1),
"$Revision: 1.7 $");
"$Revision: 1.9 $");
printf("use hd(1,a)/386bsd to boot sd0 when wd0 is also installed\n");
gateA20();
loadstart:

6
sys/i386/boot/biosboot/disk.c
View File

@ -24,7 +24,7 @@
* the rights to redistribute these changes.
*
* from: Mach, Revision 2.2 92/04/04 11:35:49 rpd
* $Id$
* $Id: disk.c,v 1.3 1993/10/16 19:11:34 rgrimes Exp $
*/
#include "boot.h"
@ -166,13 +166,14 @@ devread()
*/
#define RA_SECTORS 18
static char ra_buf[RA_SECTORS * BPS];
static int ra_dev;
static int ra_end;
static int ra_first;
Bread(dosdev,sector)
int dosdev,sector;
{
if (sector < ra_first || sector >= ra_end)
if (dosdev != ra_dev || sector < ra_first || sector >= ra_end)
{
int cyl, head, sec, nsec;
@ -192,6 +193,7 @@ Bread(dosdev,sector)
twiddle();
}
}
ra_dev = dosdev;
ra_first = sector;
ra_end = sector + nsec;
}

4
sys/i386/boot/boot.c
View File

@ -24,7 +24,7 @@
* the rights to redistribute these changes.
*
* from: Mach, [92/04/03 16:51:14 rvb]
* $Id: boot.c,v 1.7 1993/10/15 12:33:03 rgrimes Exp $
* $Id: boot.c,v 1.8 1993/10/16 19:11:31 rgrimes Exp $
*/
@ -76,7 +76,7 @@ int drive;
ouraddr,
argv[7] = memsize(0),
argv[8] = memsize(1),
"$Revision: 1.7 $");
"$Revision: 1.9 $");
printf("use hd(1,a)/386bsd to boot sd0 when wd0 is also installed\n");
gateA20();
loadstart:

6
sys/i386/boot/disk.c
View File

@ -24,7 +24,7 @@
* the rights to redistribute these changes.
*
* from: Mach, Revision 2.2 92/04/04 11:35:49 rpd
* $Id$
* $Id: disk.c,v 1.3 1993/10/16 19:11:34 rgrimes Exp $
*/
#include "boot.h"
@ -166,13 +166,14 @@ devread()
*/
#define RA_SECTORS 18
static char ra_buf[RA_SECTORS * BPS];
static int ra_dev;
static int ra_end;
static int ra_first;
Bread(dosdev,sector)
int dosdev,sector;
{
if (sector < ra_first || sector >= ra_end)
if (dosdev != ra_dev || sector < ra_first || sector >= ra_end)
{
int cyl, head, sec, nsec;
@ -192,6 +193,7 @@ Bread(dosdev,sector)
twiddle();
}
}
ra_dev = dosdev;
ra_first = sector;
ra_end = sector + nsec;
}