Don't unconditionally compile-in the bcache code. It's only used on

i386/amd64 and pc98. Remove useless calls to bcache_init() from the
ia64 and sparc64 loaders, as well as from the OFW common code.

sys/boot/common/Makefile.inc

@@ -1,6 +1,6 @@
 # $FreeBSD$
 
-SRCS+=	bcache.c boot.c commands.c console.c devopen.c interp.c 
+SRCS+=	boot.c commands.c console.c devopen.c interp.c 
 SRCS+=	interp_backslash.c interp_parse.c ls.c misc.c 
 SRCS+=	module.c panic.c
 
@@ -19,6 +19,10 @@ SRCS+=	load_elf64.c reloc_elf64.c
 SRCS+=	dev_net.c
 .endif
 
+.if defined(HAVE_BCACHE)
+SRCS+=  bcache.c
+.endif
+
 # Machine-independant ISA PnP
 .if defined(HAVE_ISABUS)
 SRCS+=	isapnp.c

sys/boot/i386/loader/Makefile

@@ -16,6 +16,9 @@ CFLAGS+=	-DLOADER_TFTP_SUPPORT
 CFLAGS+=	-DLOADER_NFS_SUPPORT
 .endif
 
+# Include bcache code.
+HAVE_BCACHE=	yes
+
 # Enable PnP and ISA-PnP code.
 HAVE_PNP=	yes
 HAVE_ISABUS=	yes

sys/boot/ia64/efi/main.c

@@ -112,11 +112,6 @@ main(int argc, CHAR16 *argv[])
 	 */
 	cons_probe();
 
-	/*
-	 * Initialise the block cache
-	 */
-	bcache_init(32, 512);		/* 16k XXX tune this */
-
 	find_pal_proc();
 
 	/*

sys/boot/ia64/ski/main.c

@@ -72,11 +72,6 @@ ski_main(void)
 	 */
 	cons_probe();
 
-	/*
-	 * Initialise the block cache
-	 */
-	bcache_init(32, 512);		/* 16k XXX tune this */
-
 	/*
 	 * March through the device switch probing for things.
 	 */

sys/boot/ofw/common/main.c

@@ -124,11 +124,6 @@ main(int (*openfirm)(void *))
 	 */
 	init_heap();
 
-	/*
-	 * Initialise the block cache
-	 */
-	bcache_init(32, 512);		/* 16k XXX tune this */
-
 	/*
 	 * March through the device switch probing for things.
 	 */

sys/boot/pc98/loader/Makefile

@@ -17,6 +17,8 @@ CFLAGS+=	-DLOADER_TFTP_SUPPORT
 CFLAGS+=	-DLOADER_NFS_SUPPORT
 .endif
 
+HAVE_BCACHE=	yes
+
 # Enable PnP and ISA-PnP code.
 HAVE_PNP=	yes
 HAVE_ISABUS=	yes

sys/boot/sparc64/loader/main.c

@@ -487,8 +487,6 @@ main(int (*openfirm)(void *))
 
 	mmu_ops->tlb_init();
 
-	bcache_init(32, 512);
-
 	/*
 	 * Initialize devices.
 	 */