Don't use 15M-16M area on pc98. It's reserved for some devices.

MFC after:	2 week

sys/boot/common/module.c

@@ -351,6 +351,9 @@ file_loadraw(char *type, char *name)
     char			*cp;
     int				fd, got;
     vm_offset_t			laddr;
+#ifdef PC98
+    struct stat			st;
+#endif
 
     /* We can't load first */
     if ((file_findfile(NULL, NULL)) == NULL) {
@@ -372,6 +375,14 @@ file_loadraw(char *type, char *name)
 	return(CMD_ERROR);
     }
 
+#ifdef PC98
+    /* We cannot use 15M-16M area on pc98. */
+    if (loadaddr < 0x1000000 &&
+	fstat(fd, &st) == 0 &&
+	(st.st_size == -1 || loadaddr + st.st_size > 0xf00000))
+	loadaddr = 0x1000000;
+#endif
+
     laddr = loadaddr;
     for (;;) {
 	/* read in 4k chunks; size is not really important */
@@ -477,6 +488,14 @@ mod_loadkld(const char *kldname, int argc, char *argv[])
 	;
 
     do {
+#ifdef PC98
+	/* We cannot use 15M-16M area on pc98. */
+	struct stat st;
+	if (loadaddr < 0x1000000 &&
+	    stat(filename, &st) == 0 &&
+	    (st.st_size == -1 || loadaddr + st.st_size > 0xf00000))
+	    loadaddr = 0x1000000;
+#endif
 	err = file_load(filename, loadaddr, &fp);
 	if (err)
 	    break;

sys/boot/pc98/Makefile.inc

@@ -7,7 +7,7 @@ BINDIR?=	/boot
 LOADER_ADDRESS?=0x200000
 CFLAGS+=	-ffreestanding -mpreferred-stack-boundary=2 \
 		-mno-mmx -mno-3dnow -mno-sse -mno-sse2 -mno-sse3 \
-		-Os
+		-Os -DPC98
 LDFLAGS+=	-nostdlib
 
 # BTX components