src/ram/ramtest.c

   1 static void write_phys(unsigned long addr, unsigned long value)
   2 {
   3 #if HAVE_MOVNTI
   4         asm volatile(
   5                 "movnti %1, (%0)"
   6                 : /* outputs */
   7                 : "r" (addr), "r" (value) /* inputs */
   8 #ifndef __GNUC__
   9                 : /* clobbers */
  10 #endif
  11                 );
  12 #else
  13         volatile unsigned long *ptr;
  14         ptr = (void *)addr;
  15         *ptr = value;
  16 #endif
  17 }
  18
  19 static unsigned long read_phys(unsigned long addr)
  20 {
  21         volatile unsigned long *ptr;
  22         ptr = (void *)addr;
  23         return *ptr;
  24 }
  25
  26 static void ram_fill(unsigned long start, unsigned long stop)
  27 {
  28         unsigned long addr;
  29         /*
  30          * Fill.
  31          */
  32         print_debug("DRAM fill: ");
  33         print_debug_hex32(start);
  34         print_debug("-");
  35         print_debug_hex32(stop);
  36         print_debug("\r\n");
  37         for(addr = start; addr < stop ; addr += 4) {
  38                 /* Display address being filled */
  39                 if (!(addr & 0xffff)) {
  40                         print_debug_hex32(addr);
  41                         print_debug(" \r");
  42                 }
  43                 write_phys(addr, addr);
  44         };
  45         /* Display final address */
  46         print_debug_hex32(addr);
  47         print_debug("\r\nDRAM filled\r\n");
  48 }
  49
  50 static void ram_verify(unsigned long start, unsigned long stop)
  51 {
  52         unsigned long addr;
  53         int i = 0;
  54         /*
  55          * Verify.
  56          */
  57         print_debug("DRAM verify: ");
  58         print_debug_hex32(start);
  59         print_debug_char('-');
  60         print_debug_hex32(stop);
  61         print_debug("\r\n");
  62         for(addr = start; addr < stop ; addr += 4) {
  63                 unsigned long value;
  64                 /* Display address being tested */
  65                 if (!(addr & 0xffff)) {
  66                         print_debug_hex32(addr);
  67                         print_debug(" \r");
  68                 }
  69                 value = read_phys(addr);
  70                 if (value != addr) {
  71                         /* Display address with error */
  72                         print_err_hex32(addr);
  73                         print_err_char(':');
  74                         print_err_hex32(value);
  75                         print_err("\r\n");
  76                         i++;
  77                         if(i>256) break;
  78                 }
  79         }
  80         /* Display final address */
  81         print_debug_hex32(addr);
  82         print_debug("\r\nDRAM verified\r\n");
  83 }
  84
  85
  86 void ram_check(unsigned long start, unsigned long stop)
  87 {
  88         int result;
  89         /*
  90          * This is much more of a "Is my DRAM properly configured?"
  91          * test than a "Is my DRAM faulty?" test.  Not all bits
  92          * are tested.   -Tyson
  93          */
  94         print_debug("Testing DRAM : ");
  95         print_debug_hex32(start);
  96         print_debug("-");
  97         print_debug_hex32(stop);
  98         print_debug("\r\n");
  99         ram_fill(start, stop);
 100         ram_verify(start, stop);
 101         print_debug("Done.\r\n");
 102 }
 103