3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
27 * At least on G2 PowerPC cores, sequential accesses to non-existent
28 * memory must be synchronized.
30 # include <asm/io.h> /* for sync() */
32 # define sync() /* nothing */
36 * Check memory range for valid RAM. A simple memory test determines
37 * the actually available RAM size between addresses `base' and
40 long get_ram_size(volatile long *base, long maxsize)
49 for (cnt = (maxsize / sizeof (long)) >> 1; cnt > 0; cnt >>= 1) {
50 addr = base + cnt; /* pointer arith! */
64 if ((val = *addr) != 0) {
65 /* Restore the original data before leaving the function.
69 for (cnt = 1; cnt < maxsize / sizeof(long); cnt <<= 1) {
77 for (cnt = 1; cnt < maxsize / sizeof (long); cnt <<= 1) {
78 addr = base + cnt; /* pointer arith! */
82 size = cnt * sizeof (long);
83 /* Restore the original data before leaving the function.
85 for (cnt <<= 1; cnt < maxsize / sizeof (long); cnt <<= 1) {