more bpmpfw shenanigans

Source/hoc-clk/bpmpfw/source/libc_platform.cpp

@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+#include "regs.hpp"
+
+namespace {
+
+    int UartStreamPutc(int c, FILE *) {
+        UartPutc(static_cast<char>(c));
+        return c;
+    }
+
+    FILE g_uartStdout = { nullptr, UartStreamPutc, nullptr, nullptr, nullptr, -1 };
+
+} // namespace
+
+void InitializeLibc() {
+    stdout = &g_uartStdout;
+}