mbv: now with functioning timer interrupts!

And a few other nice things.
The bootloader now has an embedded wozmon!
If you know its offset, you can jump to it from the app.

mbv/bootloader/bootloader.cc

@@ -1,19 +1,23 @@
 #include <cstdint>
 
+#include "pol0.h"
 #include "xuartlite.h"
 
+uint8_t UartRead();
+void UartWrite(uint8_t);
+
 struct Gpio {
     volatile uint32_t data;
 };
 
-#define gpio0 ((Gpio*)0x40000000)
+#define gpio0 ((Gpio*)GPIO0_BASE)
 
 namespace {
-constexpr uintptr_t kUart0BaseAddress = 0x40600000;
+
 XUartLite uart0_inst;
 XUartLite_Config uart0_config = {
     .DeviceId = 0,
-    .RegBaseAddr = kUart0BaseAddress,
+    .RegBaseAddr = UART0_BASE,
     .BaudRate = 115200,
     .UseParity = false,
     .DataBits = 8,
@@ -25,15 +29,6 @@ void InitUarts() {
     XUartLite_CfgInitialize(uart0, &uart0_config, uart0_config.RegBaseAddr);
 }
 
-uint8_t UartRead() {
-    uint8_t c;
-    while (XUartLite_Recv(uart0, &c, 1) < 1) {
-    }
-    return c;
-}
-
-void UartWrite(uint8_t c) { XUartLite_Send(uart0, &c, 1); }
-
 uint32_t UartRead32() {
     uint32_t val = 0;
 
@@ -45,8 +40,21 @@ uint32_t UartRead32() {
 
     return val;
 }
+
 }  // namespace
 
+uint8_t UartRead() {
+    uint8_t c;
+    while (XUartLite_Recv(uart0, &c, 1) < 1) {
+    }
+    return c;
+}
+
+void UartWrite(uint8_t c) {
+    XUartLite_Send(uart0, &c, 1);
+    while (XUartLite_IsSending(uart0)) {}
+}
+
 int main() {
     gpio0->data = 1;