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         /*
  54          * Verify.
  55          */
  56         print_debug("DRAM verify: ");
  57         print_debug_hex32(start);
  58         print_debug_char('-');
  59         print_debug_hex32(stop);
  60         print_debug("\r\n");
  61         for(addr = start; addr < stop ; addr += 4) {
  62                 unsigned long value;
  63                 /* Display address being tested */
  64                 if (!(addr & 0xffff)) {
  65                         print_debug_hex32(addr);
  66                         print_debug("\r");
  67                 }
  68                 value = read_phys(addr);
  69                 if (value != addr) {
  70                         /* Display address with error */
  71                         print_err_hex32(addr);
  72                         print_err_char(':');
  73                         print_err_hex32(value);
  74                         print_err("\r\n");
  75                 }
  76         }
  77         /* Display final address */
  78         print_debug_hex32(addr);
  79         print_debug("\r\nDRAM verified\r\n");
  80 }
  81
  82
  83 void ram_check(unsigned long start, unsigned long stop)
  84 {
  85         int result;
  86         /*
  87          * This is much more of a "Is my DRAM properly configured?"
  88          * test than a "Is my DRAM faulty?" test.  Not all bits
  89          * are tested.   -Tyson
  90          */
  91         print_debug("Testing DRAM : ");
  92         print_debug_hex32(start);
  93         print_debug("-");
  94         print_debug_hex32(stop);
  95         print_debug("\r\n");
  96         ram_fill(start, stop);
  97         ram_verify(start, stop);
  98         print_debug("Done.\r\n");
  99 }
 100