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From: Ngie Cooper <ngie@FreeBSD.org>
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Subject: svn commit: r316132 - head/sys/boot/i386/boot2
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Author: ngie
Date: Wed Mar 29 09:30:03 2017
New Revision: 316132
URL: https://svnweb.freebsd.org/changeset/base/316132

Log:
  Parameterize out 7680 (15 * 512) as BOOT2SIZE, similar to sys/boot/i386/zfsboot/...
  
  This is being done to make it easier to change in the future--this action might be
  needed sooner rather than later because of gcc 6.3.0 bailing, stating that there
  is negative free space left (deficit) in the boot2 bootloader.
  
  MFC after:	2 months
  Sponsored by:	Dell EMC Isilon

Modified:
  head/sys/boot/i386/boot2/Makefile

Modified: head/sys/boot/i386/boot2/Makefile
==============================================================================
--- head/sys/boot/i386/boot2/Makefile	Wed Mar 29 08:38:31 2017	(r316131)
+++ head/sys/boot/i386/boot2/Makefile	Wed Mar 29 09:30:03 2017	(r316132)
@@ -66,10 +66,12 @@ boot1.out: boot1.o
 CLEANFILES+=	boot2 boot2.ld boot2.ldr boot2.bin boot2.out boot2.o \
 		boot2.h sio.o
 
+BOOT2SIZE=	7680
+
 boot2: boot2.ld
-	@set -- `ls -l ${.ALLSRC}`; x=$$((7680-$$5)); \
+	@set -- `ls -l ${.ALLSRC}`; x=$$((${BOOT2SIZE}-$$5)); \
 	    echo "$$x bytes available"; test $$x -ge 0
-	${DD} if=${.ALLSRC} of=${.TARGET} obs=7680 conv=osync
+	${DD} if=${.ALLSRC} of=${.TARGET} obs=${BOOT2SIZE} conv=osync
 
 boot2.ld: boot2.ldr boot2.bin ${BTXKERN}
 	btxld -v -E ${ORG2} -f bin -b ${BTXKERN} -l boot2.ldr \