Create SDRAM memory region

sw/main.c

@@ -5,16 +5,22 @@
 #include "uart.h"
 
 int main() {
-    char s[16];
+    uint8_t* test;
+    uint8_t i;
+
+    test = (uint8_t*)0x5000;
 
     clrscr();
-    cprintf("Hello, world!\n");
 
-    while (1) {
-        cscanf("%15s", s);
-        cprintf("Read string: %s\n", s);
+    for (test = (uint8_t*)0x4000; test < (uint8_t*)0x5000; test++) {
+        for (i = 0; i < 64; i++) {
+            *test = i;
+            if (*test != i)
+                cprintf("Failed to read/write %x to %x\n", i, test);
+        }
     }
 
+    cprintf("Done! no SDRAM errors!\n");
 
     return 0;
 }