13.20 and 13.00 support (#49)

* add 13.20 support

* add 13.00 support

* Update README.md

update readme to reflect new 13.00, 13.20 and 13.60 support.

shellcode_kernel/main.c

@@ -1,6 +1,8 @@
 #include "main.h"
 #include "boot_linux.h"
+#if !defined(FW_13XX_PORT)
 #include "hv_defeat_0304.h"
+#endif
 #include "utils.h"
 #include <stddef.h>
 
@@ -22,8 +24,12 @@ __attribute__((section(".entry_point"))) uint32_t main(uint64_t add1,
     return -1;
   }
 
+#if defined(FW_13XX_PORT)
+  if (args_ptr->fw_version < 0x1300 || args_ptr->fw_version >= 0x1400)
+    return -1;
+  activate_uart(args_ptr);
+#else
   activate_uart(args_ptr);
-
   if ((0x0300 <= args_ptr->fw_version) && (args_ptr->fw_version < 0x0500)) {
     if (hv_defeat_0304(args_ptr))
       return -1;
@@ -33,6 +39,7 @@ __attribute__((section(".entry_point"))) uint32_t main(uint64_t add1,
   } else {
     return 0;
   }
+#endif
 
   // Now we can R/W on .text
   init_global_pointers(args_ptr);