Date: Thu, 8 Sep 2005 14:18:44 -0400 From: Jung-uk Kim <jkim@FreeBSD.org> To: freebsd-arch@FreeBSD.org Subject: Bigger boot block size? Message-ID: <200509081418.47794.jkim@FreeBSD.org>
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I have been working on boot2 recently. I faced constant problem with
boot2 size limitation. Can we have bigger boot block size (aka
BBSIZE)? In the future, we may have to support different file system
to boot from and we won't have any space to add the support without
dropping UFS1 support. In fact, I am using 32-sector boot block and
I don't see any problem so far. The patch that I've been using is
attached.
Cheers,
Jung-uk Kim
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Index: src/sys/boot/i386/boot2/Makefile
===================================================================
RCS file: /home/ncvs/src/sys/boot/i386/boot2/Makefile,v
retrieving revision 1.59
diff -u -r1.59 Makefile
--- src/sys/boot/i386/boot2/Makefile 15 Jul 2005 12:22:14 -0000 1.59
+++ src/sys/boot/i386/boot2/Makefile 8 Sep 2005 18:13:32 -0000
@@ -60,9 +60,9 @@
boot2.s boot2.s.tmp boot2.h sio.o
boot2: boot2.ld
- @set -- `ls -l boot2.ld`; x=$$((7680-$$5)); \
+ @set -- `ls -l boot2.ld`; x=$$((15872-$$5)); \
echo "$$x bytes available"; test $$x -ge 0
- dd if=boot2.ld of=${.TARGET} obs=7680 conv=osync
+ dd if=boot2.ld of=${.TARGET} obs=15872 conv=osync
boot2.ld: boot2.ldr boot2.bin ${BTXKERN}
btxld -v -E ${ORG2} -f bin -b ${BTXKERN} -l boot2.ldr \
Index: src/sys/boot/i386/boot2/boot1.S
===================================================================
RCS file: /home/ncvs/src/sys/boot/i386/boot2/boot1.S,v
retrieving revision 1.30
diff -u -r1.30 boot1.S
--- src/sys/boot/i386/boot2/boot1.S 28 Aug 2004 08:32:23 -0000 1.30
+++ src/sys/boot/i386/boot2/boot1.S 8 Sep 2005 18:13:32 -0000
@@ -37,7 +37,7 @@
.set SIZ_PAG,0x1000 # Page size
.set SIZ_SEC,0x200 # Sector size
- .set NSECT,0x10
+ .set NSECT,0x20
.globl start
.globl xread
.code16
Index: src/sys/sys/disklabel.h
===================================================================
RCS file: /home/ncvs/src/sys/sys/disklabel.h,v
retrieving revision 1.107
diff -u -r1.107 disklabel.h
--- src/sys/sys/disklabel.h 7 Apr 2005 22:09:02 -0000 1.107
+++ src/sys/sys/disklabel.h 8 Sep 2005 18:13:32 -0000
@@ -68,7 +68,7 @@
#endif
/* Size of bootblock area in sector-size neutral bytes */
-#define BBSIZE 8192
+#define BBSIZE 16384
#define LABEL_PART 2 /* partition containing label */
#define RAW_PART 2 /* partition containing whole disk */
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