Index: conf/Makefile.sparc
===================================================================
RCS file: /cvsroot/src/sys/arch/sparc/conf/Makefile.sparc,v
retrieving revision 1.96
diff -p -u -r1.96 Makefile.sparc
--- conf/Makefile.sparc	22 Sep 2018 12:24:03 -0000	1.96
+++ conf/Makefile.sparc	9 Dec 2020 10:11:58 -0000
@@ -61,7 +61,7 @@ amd7930intr.o bsd_fdintr.o lock_stubs.o:
 ##
 ## (5) link settings
 ##
-TEXTADDR?=	F0004000
+TEXTADDR?=	E0004000
 EXTRA_LINKFLAGS=	-X
 KERNLDSCRIPT?= ${SPARC}/conf/kern.ldscript
 LINKFORMAT=	-n
Index: include/param.h
===================================================================
RCS file: /cvsroot/src/sys/arch/sparc/include/param.h,v
retrieving revision 1.74
diff -p -u -r1.74 param.h
--- include/param.h	1 May 2020 08:21:27 -0000	1.74
+++ include/param.h	9 Dec 2020 10:11:58 -0000
@@ -71,8 +71,12 @@ extern int nbpg, pgofset, pgshift;
 #endif
 
 #if !(defined(PROM_AT_F0) || defined(MSIIEP))
+#if 0
 #define	KERNBASE	0xf0000000	/* start of kernel virtual space */
 #else
+#define	KERNBASE	0xe0000000	/* start of kernel virtual space */
+#endif
+#else
 /*
  * JS1/OF has prom sitting in f000.0000..f007.ffff, modify kernel VA 
  * layout to work around that. XXX - kernel should live beyound prom on
@@ -106,9 +110,15 @@ extern int nbpg, pgofset, pgshift;
 /*
  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
  * logical pages.
+ *
+ * SPARC KVA is from KERNBASE until 0xfe00.0000 where the PROM normally
+ * lives.  NetBSD originally used KERNBASE of 0xf000.0000 (except for
+ * systems like Krups, that put the PROM here), but was switched to
+ * 0xe000.000 for NetBSD 10.0 as it's quite easy to use more than 224MB
+ * of KVA on a 512MB system (max for sun4m.)
  */
 #define	NKMEMPAGES_MIN_DEFAULT	((16 * 1024 * 1024) >> PAGE_SHIFT)
-#define	NKMEMPAGES_MAX_DEFAULT	((128 * 1024 * 1024) >> PAGE_SHIFT)
+#define	NKMEMPAGES_MAX_DEFAULT	((320 * 1024 * 1024) >> PAGE_SHIFT)
 
 #if defined(_KERNEL) || defined(_STANDALONE)
 #ifndef _LOCORE
Index: sparc/autoconf.c
===================================================================
RCS file: /cvsroot/src/sys/arch/sparc/sparc/autoconf.c,v
retrieving revision 1.261
diff -p -u -r1.261 autoconf.c
--- sparc/autoconf.c	14 Aug 2020 10:34:22 -0000	1.261
+++ sparc/autoconf.c	9 Dec 2020 10:11:58 -0000
@@ -171,6 +171,8 @@ matchbyname(device_t parent, cfdata_t cf
 /*
  * Get the number of CPUs in the system and the CPUs' SPARC architecture
  * version. We need this information early in the boot process.
+ *
+ * This also sets cpu_arch to 8 on sun4m and sun4d.
  */
 static int
 find_cpus(void)
Index: stand/boot/boot.c
===================================================================
RCS file: /cvsroot/src/sys/arch/sparc/stand/boot/boot.c,v
retrieving revision 1.30
diff -p -u -r1.30 boot.c
--- stand/boot/boot.c	11 Jun 2016 06:43:16 -0000	1.30
+++ stand/boot/boot.c	9 Dec 2020 10:11:58 -0000
@@ -181,6 +181,7 @@ loadk(char *kernel, u_long *marks)
 		goto out;
 
 	size = marks[MARK_END] - marks[MARK_START];
+printf("%s:%d: init size = %lu (%lu .. %lu)\n", __func__, __LINE__, size, marks[MARK_START], marks[MARK_END]);
 
 	/* We want that leading 16K in front of the kernel image */
 	size += PROM_LOADADDR;
@@ -196,6 +197,10 @@ loadk(char *kernel, u_long *marks)
 	if (!compatmode)
 		size += 512 * 1024;
 
+/* XXX MRG */
+size += 512 * 1024;
+printf("%s:%d: final size = %lu"\n, __func__, __LINE__, size);
+
 	/* Get a physical load address */
 	pa = getphysmem(size);
 	if (pa == (paddr_t)-1) {