New memprobe for weird machines... please test.

diff --git a/sys/arch/i386/stand/libsa/memprobe.c b/sys/arch/i386/stand/libsa/memprobe.c
index 4dc2ca6..621e152 100644 (file)
--- a/sys/arch/i386/stand/libsa/memprobe.c
+++ b/sys/arch/i386/stand/libsa/memprobe.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: memprobe.c,v 1.4 1997/04/15 06:43:15 mickey Exp $     */
+/*     $OpenBSD: memprobe.c,v 1.5 1997/04/17 17:21:16 weingart Exp $   */
 
 /*
  * Copyright (c) 1997 Tobias Weingartner
@@ -47,7 +47,7 @@ memprobe()
 
        /* probe extended memory
         *
-        * There is no need to do this in assembly language.  This are
+        * There is no need to do this in assembly language.  This is
         * much easier to debug in C anyways.
         */
        for(ram = 1024; ram < 512*1024; ram += 4){
@@ -64,6 +64,12 @@ memprobe()
  *
  * This is a hack, but it seems to work ok.  Maybe this is
  * the *real* way that you are supposed to do probing???
+ *
+ * Modify the original a bit.  We write everything first, and
+ * then test for the values.  This should croak on machines that
+ * return values just written on non-existent memory...
+ *
+ * BTW: These machines are pretty boken IMHO.
  */
 static int addrprobe(int kloc){
        volatile int *loc, i;
@@ -82,6 +88,16 @@ static int addrprobe(int kloc){
                if(*loc != pat[i]) return(1);
        }
 
+       /* Write address */
+       for(i = 0; i < sizeof(pat)/sizeof(pat[0]); i++){
+               loc[i] = pat[i];
+       }
+
+       /* Read address */
+       for(i = 0; i < sizeof(pat)/sizeof(pat[0]); i++){
+               if(loc[i] != pat[i]) return(1);
+       }
+
        return(0);
 }