rust-embedded
diff --git a/‎cortex-m-rt/CHANGELOG.md
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diff --git a/‎cortex-m-rt/examples/pre_init.rs
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+9-4Lines changed: 9 additions & 4 deletions b/‎cortex-m-rt/examples/pre_init.rs
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+9-4Lines changed: 9 additions & 4 deletions
diff --git a/‎cortex-m-rt/macros/src/lib.rs
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@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+- Mark `pre_init` as deprecated
 - Add `set_msplim` feature to conditionally set the MSPLIM register at device
   reset ([#580]).
 
 
@@ -7,11 +7,16 @@
 extern crate cortex_m_rt as rt;
 extern crate panic_halt;
 
-use rt::{entry, pre_init};
+use rt::entry;
 
-#[pre_init]
-unsafe fn disable_watchdog() {
-    // Do what you need to disable the watchdog.
+// This function is called before the RAM is initialized.
+// For example, it can be used to disable the watchdog.
+core::arch::global_asm! {
+    r#"
+__pre_init:
+    // Do what you need to do before RAM is initialized.
+    ret
+    "#
 }
 
 #[entry]
 
@@ -628,6 +628,7 @@ pub fn interrupt(args: TokenStream, input: TokenStream) -> TokenStream {
 }
 
 #[proc_macro_attribute]
+#[deprecated(note = "Use core::arch::global_asm! to define the __pre_init function instead")]
 pub fn pre_init(args: TokenStream, input: TokenStream) -> TokenStream {
     let f = parse_macro_input!(input as ItemFn);
Original file line number	Diff line number	Diff line change
`@@ -628,6 +628,7 @@ pub fn interrupt(args: TokenStream, input: TokenStream) -> TokenStream {`
`628`	`628`	`}`
`629`	`629`
`630`	`630`	`#[proc_macro_attribute]`
	`631`	`+#[deprecated(note = "Use core::arch::global_asm! to define the __pre_init function instead")]`
`631`	`632`	`pub fn pre_init(args: TokenStream, input: TokenStream) -> TokenStream {`
`632`	`633`	`let f = parse_macro_input!(input as ItemFn);`
`633`	`634`