stm32/ipcc: extract tl_mbox linker file to embassy-stm32

embassy-stm32/build.rs

@@ -910,6 +910,16 @@ fn main() {
         println!("cargo:rustc-cfg={}x{}", &chip_name[..9], &chip_name[10..11]);
     }
 
+    // ========
+    // stm32wb tl_mbox link sections
+
+    if chip_name.starts_with("stm32wb") {
+        let out_file = out_dir.join("tl_mbox.x").to_string_lossy().to_string();
+        fs::write(out_file, fs::read_to_string("tl_mbox.x.in").unwrap()).unwrap();
+        println!("cargo:rustc-link-search={}", out_dir.display());
+        println!("cargo:rerun-if-changed=tl_mbox.x.in");
+    }
+
     // =======
     // Features for targeting groups of chips
 

embassy-stm32/tl_mbox.x.in

@@ -1,21 +1,13 @@
-/*
-    Memory size for STM32WB55xG with 512K FLASH
-*/
-
 MEMORY 
 {
-    FLASH (rx)                 : ORIGIN = 0x08000000, LENGTH = 512K
-    RAM (xrw)                  : ORIGIN = 0x20000008, LENGTH = 0x2FFF8
     RAM_SHARED (xrw)           : ORIGIN = 0x20030000, LENGTH = 10K
 }
 
-/* Place stack at the end of SRAM1 */
-_stack_start = ORIGIN(RAM) + LENGTH(RAM);
-
 /*
  * Scatter the mailbox interface memory sections in shared memory
  */
-SECTIONS {
+SECTIONS
+{
     TL_REF_TABLE                     (NOLOAD) : { *(TL_REF_TABLE) } >RAM_SHARED
 
     MB_MEM1 (NOLOAD)                          : { *(MB_MEM1) } >RAM_SHARED

examples/stm32wb/Cargo.toml

@@ -8,7 +8,7 @@ license = "MIT OR Apache-2.0"
 embassy-sync = { version = "0.2.0", path = "../../embassy-sync", features = ["defmt"] }
 embassy-executor = { version = "0.2.0", path = "../../embassy-executor", features = ["arch-cortex-m", "executor-thread", "defmt", "integrated-timers"] }
 embassy-time = { version = "0.1.0", path = "../../embassy-time", features = ["defmt", "defmt-timestamp-uptime", "tick-hz-32_768"] }
-embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = ["nightly", "defmt", "stm32wb55rg", "time-driver-any", "exti"]  }
+embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = ["nightly", "defmt", "stm32wb55rg", "time-driver-any", "memory-x", "exti"]  }
 
 defmt = "0.3"
 defmt-rtt = "0.4"

examples/stm32wb/build.rs

@@ -1,35 +1,11 @@
-//! This build script copies the `memory.x` file from the crate root into
+use std::error::Error;
-//! a directory where the linker can always find it at build time.
-//! For many projects this is optional, as the linker always searches the
-//! project root directory -- wherever `Cargo.toml` is. However, if you
-//! are using a workspace or have a more complicated build setup, this
-//! build script becomes required. Additionally, by requesting that
-//! Cargo re-run the build script whenever `memory.x` is changed,
-//! updating `memory.x` ensures a rebuild of the application with the
-//! new memory settings.
-
-use std::env;
-use std::fs::File;
-use std::io::Write;
-use std::path::PathBuf;
-
-fn main() {
-    // Put `memory.x` in our output directory and ensure it's
-    // on the linker search path.
-    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
-    File::create(out.join("memory.x"))
-        .unwrap()
-        .write_all(include_bytes!("memory.x"))
-        .unwrap();
-    println!("cargo:rustc-link-search={}", out.display());
-
-    // By default, Cargo will re-run a build script whenever
-    // any file in the project changes. By specifying `memory.x`
-    // here, we ensure the build script is only re-run when
-    // `memory.x` is changed.
-    println!("cargo:rerun-if-changed=memory.x");
 
+fn main() -> Result<(), Box<dyn Error>> {
     println!("cargo:rustc-link-arg-bins=--nmagic");
     println!("cargo:rustc-link-arg-bins=-Tlink.x");
+    println!("cargo:rerun-if-changed=link.x");
+    println!("cargo:rustc-link-arg-bins=-Ttl_mbox.x");
     println!("cargo:rustc-link-arg-bins=-Tdefmt.x");
+
+    Ok(())
 }

examples/stm32wb/memory.x

@@ -1,35 +0,0 @@
-/*
-    The size of this file must be exactly the same as in other memory_xx.x files.
-    Memory size for STM32WB55xC with 256K FLASH
-*/
-
-MEMORY
-{
-    FLASH (rx)                 : ORIGIN = 0x08000000, LENGTH = 256K
-    RAM (xrw)                  : ORIGIN = 0x20000000, LENGTH = 192K
-    RAM_SHARED (xrw)           : ORIGIN = 0x20030000, LENGTH = 10K
-}
-
-/* 
-    Memory size for STM32WB55xG with 512K FLASH
-
-    MEMORY
-    {
-        FLASH (rx)                 : ORIGIN = 0x08000000, LENGTH = 512K
-        RAM (xrw)                  : ORIGIN = 0x20000008, LENGTH = 0x2FFF8
-        RAM_SHARED (xrw)           : ORIGIN = 0x20030000, LENGTH = 10K
-    }
-*/
-
-/* Place stack at the end of SRAM1 */
-_stack_start = ORIGIN(RAM) + LENGTH(RAM);
-
-/*
- * Scatter the mailbox interface memory sections in shared memory
- */
-SECTIONS {
-    TL_REF_TABLE                     (NOLOAD) : { *(TL_REF_TABLE) } >RAM_SHARED
-
-    MB_MEM1 (NOLOAD)                          : { *(MB_MEM1) } >RAM_SHARED
-    MB_MEM2 (NOLOAD)                          : { _sMB_MEM2 = . ; *(MB_MEM2) ; _eMB_MEM2 = . ; } >RAM_SHARED
-}