imported Freescale specific U-Boot additions for i.MX28,... release L2.6.31_10.08.01

[karo-tx-uboot.git] / common / memsize.c

diff --git a/common/memsize.c b/common/memsize.c
index dbc812dfc51e65cd351cc1af069714a5f76e5734..6c275c9b25feec5189d2717f8dd35c46d6eb88da 100755 (executable)
--- a/common/memsize.c
+++ b/common/memsize.c
@@ -21,6 +21,16 @@
  * MA 02111-1307 USA
  */
 
+#include <config.h>
+#ifdef __PPC__
+/*
+ * At least on G2 PowerPC cores, sequential accesses to non-existent
+ * memory must be synchronized.
+ */
+# include <asm/io.h>   /* for sync() */
+#else
+# define sync()                /* nothing */
+#endif
 
 /*
  * Check memory range for valid RAM. A simple memory test determines
@@ -38,20 +48,27 @@ long get_ram_size(volatile long *base, long maxsize)
 
        for (cnt = (maxsize / sizeof (long)) >> 1; cnt > 0; cnt >>= 1) {
                addr = base + cnt;      /* pointer arith! */
+               sync ();
                save[i++] = *addr;
+               sync ();
                *addr = ~cnt;
        }
 
        addr = base;
+       sync ();
        save[i] = *addr;
+       sync ();
        *addr = 0;
 
+       sync ();
        if ((val = *addr) != 0) {
                /* Restore the original data before leaving the function.
                 */
+               sync ();
                *addr = save[i];
                for (cnt = 1; cnt < maxsize / sizeof(long); cnt <<= 1) {
                        addr  = base + cnt;
+                       sync ();
                        *addr = save[--i];
                }
                return (0);