diff options
Diffstat (limited to 'cortex-m-rt/src/lib.rs')
| -rw-r--r-- | cortex-m-rt/src/lib.rs | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/cortex-m-rt/src/lib.rs b/cortex-m-rt/src/lib.rs index 31e4ea3..04d5b9e 100644 --- a/cortex-m-rt/src/lib.rs +++ b/cortex-m-rt/src/lib.rs @@ -238,8 +238,10 @@ //! `__EXCEPTIONS` in the `.vector_table` section. //! //! - `__pre_init`. This is a function to be run before RAM is initialized. It defaults pointing at -//! `0` and if not changed to point to another address, usually by calling the `pre_init!` macro, -//! the `_pre_init` function is skipped. +//! `1` and if not changed to point to another address, usually by calling the `pre_init!` macro, +//! the `_pre_init` function is skipped. The function cannot default to `0` as the compiler +//! optimizes out the check for `0` under the assumption that a function pointer cannot point to +//! `0`. //! //! If you override any exception handler you'll find it as an unmangled symbol, e.g. `SysTick` or //! `SVCall`, in the output of `objdump`, |