Add tests for symmetric rocket chiplet config

tests/symmetric.c

@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <string.h>
+#include <riscv-pk/encoding.h>
+#include "marchid.h"
+
+#define OBUS_OFFSET (0x1L << 32)
+
+char src[] = "This is a test string. It will be written into the off-chip memory address, then copied back.";
+char dest[4096];
+char test[4096];
+
+int main(void) {
+  size_t write_start = rdcycle();
+  memcpy(dest + OBUS_OFFSET, src, sizeof(src));
+  size_t write_end = rdcycle();
+
+  printf("Wrote %ld bytes in %ld cycles\n", sizeof(src), write_end - write_start);
+
+  size_t read_start = rdcycle();
+  memcpy(test, dest + OBUS_OFFSET, sizeof(src));
+  size_t read_end = rdcycle();
+
+  if (memcmp(src, test, sizeof(src))) {
+    printf("Remote write/read failed\n");
+    exit(1);
+  }
+  printf("Read %ld bytes in %ld cycles\n", sizeof(src), read_end - read_start);
+
+  return 0;
+}