diff options
Diffstat (limited to 'common/memsize.c')
| -rw-r--r-- | common/memsize.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/common/memsize.c b/common/memsize.c index dbc812d..6c275c9 100644 --- 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); |