[src/trunk]: src/sys/arch/x68k/stand/boot Probe the actual memory size and wa...

[tsutsui <tsutsui%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/973cb61bf793
branches:  trunk
changeset: 797120:973cb61bf793
user:      tsutsui <tsutsui%NetBSD.org@localhost>
date:      Sun Jul 06 08:10:21 2014 +0000

description:
Probe the actual memory size and warn if it's different from SRAM value.

Without this, ancient X680x0 machines with a dead SRAM battery will
fail to boot silently (or hang right after early copyright messages).

Discussed with and reviewed by isaki@.

XXX: probably we should rather pass the probed memory size to a kernel
XXX: than the size value stored in SRAM..

diffstat:

 sys/arch/x68k/stand/boot/boot.c |  35 +++++++++++++++++++++++++++++++++--
 1 files changed, 33 insertions(+), 2 deletions(-)

diffs (69 lines):

diff -r 3f80d203515b -r 973cb61bf793 sys/arch/x68k/stand/boot/boot.c
--- a/sys/arch/x68k/stand/boot/boot.c   Sun Jul 06 08:06:03 2014 +0000
+++ b/sys/arch/x68k/stand/boot/boot.c   Sun Jul 06 08:10:21 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: boot.c,v 1.20 2014/07/06 06:28:49 tsutsui Exp $        */
+/*     $NetBSD: boot.c,v 1.21 2014/07/06 08:10:21 tsutsui Exp $        */
 
 /*
  * Copyright (c) 2001 Minoura Makoto
@@ -327,6 +327,23 @@
        }
 }
 
+static u_int
+checkmemsize(void)
+{
+       u_int m;
+
+#define MIN_MB 4
+#define MAX_MB 12
+
+       for (m = MIN_MB; m <= MAX_MB; m++) {
+               if (badbaddr((void *)(m * 1024 * 1024 - 1))) {
+                       /* no memory */
+                       break;
+               }
+       }
+
+       return (m - 1) * 1024 * 1024;
+}
 
 extern const char bootprog_rev[];
 extern const char bootprog_name[];
@@ -339,6 +356,8 @@
 void
 bootmain(int bootdev)
 {
+       u_int sram_memsize;
+       u_int probed_memsize;
 
 #ifndef NETBOOT
        hostadaptor = get_scsi_host_adapter();
@@ -352,7 +371,8 @@
                printf("This MPU cannot run NetBSD.\n");
                exit(1);
        }
-       if (SRAM_MEMSIZE < 4*1024*1024) {
+       sram_memsize = SRAM_MEMSIZE;
+       if (sram_memsize < 4*1024*1024) {
                printf("Main memory too small.\n");
                exit(1);
        }
@@ -383,5 +403,16 @@
        }
 #endif
        print_title("%s, Revision %s\n", bootprog_name, bootprog_rev);
+
+       /* check actual memory size for machines with a dead SRAM battery */
+       probed_memsize = checkmemsize();
+       if (sram_memsize != probed_memsize) {
+               printf("\x1b[1mWarning: SRAM Memory Size (%d MB) "
+                   "is different from probed Memory Size (%d MB)\n"
+                   "         Check and reset SRAM values.\x1b[m\n\n",
+                   sram_memsize / (1024 * 1024),
+                   probed_memsize / (1024 * 1024));
+       }
+
        bootmenu();
 }