rp: add precompiled boot2 to avoid depending on gcc

4 files changed, 29 insertions, 0 deletions

diff --git a/embassy-rp/build.rs b/embassy-rp/build.rs
new file mode 100644
index 000000000..bc59ea23b
--- /dev/null
+++ b/embassy-rp/build.rs
@@ -0,0 +1,17 @@
+use std::fs::{self, File};
+use std::io::Write;
+use std::path::{Path, PathBuf};
+use std::{env, ffi::OsStr};
+
+fn main() {
+    // Put the linker script somewhere the linker can find it
+    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    let link_x = include_bytes!("link-rp.x.in");
+    let mut f = File::create(out.join("link-rp.x")).unwrap();
+    f.write_all(link_x).unwrap();
+
+    println!("cargo:rustc-link-search={}", out.display());
+
+    println!("cargo:rerun-if-changed=build.rs");
+    println!("cargo:rerun-if-changed=link-rp.x.in");
+}
diff --git a/embassy-rp/link-rp.x.in b/embassy-rp/link-rp.x.in
new file mode 100644
index 000000000..af463f963
--- /dev/null
+++ b/embassy-rp/link-rp.x.in
@@ -0,0 +1,8 @@
+
+SECTIONS {
+    /* ### Boot loader */
+    .boot2 ORIGIN(BOOT2) :
+    {
+        KEEP(*(.boot2));
+    } > BOOT2
+}
\ No newline at end of file
diff --git a/embassy-rp/src/boot2.bin b/embassy-rp/src/boot2.bin
new file mode 100644
index 000000000..fdc1fc756
--- /dev/null
+++ b/embassy-rp/src/boot2.bin
diff --git a/embassy-rp/src/system.rs b/embassy-rp/src/system.rs
index 200f88d63..ba1396433 100644
--- a/embassy-rp/src/system.rs
+++ b/embassy-rp/src/system.rs
@@ -1,5 +1,9 @@
 use crate::{pac, pll, resets};
 
+#[link_section = ".boot2"]
+#[used]
+pub static BOOT2: [u8; 256] = *include_bytes!("boot2.bin");
+
 #[non_exhaustive]
 pub struct Config {}