Fix memory layout

lwcpu/src/lib.rs

@@ -2,7 +2,7 @@
 
 use core::ptr::{read_volatile, write_volatile};
 
-const BASE_POINTER: u32 = 0x2000_0000;
+const BASE_POINTER: u32 = 0x1000_0000;
 
 const NUMBER_DISPLAY_OFFSET: u32 = 0x00;
 const RANDOM_NUMBER_OFFSET: u32 = 0x04;

test/build.rs

@@ -0,0 +1,14 @@
+// build.rs
+use std::env;
+use std::fs;
+use std::path::PathBuf;
+
+fn main() {
+    let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
+
+    // Put the linker script somewhere the linker can find it.
+    fs::write(out_dir.join("memory.x"), include_bytes!("memory.x")).unwrap();
+    println!("cargo:rustc-link-search={}", out_dir.display());
+    println!("cargo:rerun-if-changed=memory.x");
+    println!("cargo:rerun-if-changed=build.rs");
+}

test/memory.x

@@ -1,9 +1,9 @@
 MEMORY
 {
   INST  : ORIGIN = 0x00000000, LENGTH = 256K
-  IO    : ORIGIN = 0x20000000, LENGTH = 1K
-  CONST : ORIGIN = 0x40000000, LENGTH = 16K
-  RAM   : ORIGIN = 0x80000000, LENGTH = 16K
+  IO    : ORIGIN = 0x10000000, LENGTH = 1K
+  CONST : ORIGIN = 0x20000000, LENGTH = 16K
+  RAM   : ORIGIN = 0x40000000, LENGTH = 16K
 }
 
 REGION_ALIAS("REGION_TEXT", INST);