arch/ppc/boot/simple/cpc700_memory.c

   1 /*
   2  * arch/ppc/boot/common/cpc700_memory.c
   3  *
   4  * Find memory based upon settings in the CPC700 bridge
   5  *
   6  * Author: Dan Cox
   7  *
   8  * 2001-2002 (c) MontaVista, Software, Inc.  This file is licensed under
   9  * the terms of the GNU General Public License version 2.  This program
  10  * is licensed "as is" without any warranty of any kind, whether express
  11  * or implied.
  12  */
  13
  14 #include <asm/types.h>
  15 #include <asm/io.h>
  16 #include "cpc700.h"
  17
  18 unsigned long
  19 cpc700_get_mem_size(void)
  20 {
  21         int i;
  22         unsigned long len, amt;
  23
  24         /* Start at MB1EA, since MB0EA will most likely be the ending address
  25            for ROM space. */
  26         for(len = 0, i = CPC700_MB1EA; i <= CPC700_MB4EA; i+=4) {
  27                 amt = cpc700_read_memreg(i);
  28                 if (amt == 0)
  29                         break;
  30                 len = amt;
  31         }
  32
  33         return len;
  34 }
  35
  36