--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/target-utils/pln-ppb-test/read_id.c	Sun Dec 03 00:04:18 2023 +0000
@@ -0,0 +1,28 @@
+/*
+ * read-id (Autoselect) command
+ */
+
+#include <sys/types.h>
+#include "types.h"
+
+void
+cmd_read_id(argbulk)
+	char *argbulk;
+{
+	char *argv[2];
+	u_long addr;
+
+	if (parse_args(argbulk, 1, 1, argv, 0) < 0)
+		return;
+	if (parse_hexarg(argv[0], 8, &addr) < 0) {
+		printf("ERROR: argument must be a valid 32-bit hex address\n");
+		return;
+	}
+	if (addr & 0xFFFF) {
+		printf("ERROR: address is not on 64 KiB boundary\n");
+		return;
+	}
+	*(volatile u16 *)(addr + 0xAAA) = 0xAA;
+	*(volatile u16 *)(addr + 0x554) = 0x55;
+	*(volatile u16 *)(addr + 0xAAA) = 0x90;
+}