Rather than doing the following, is there a low-level way to initialise the data held to a specific value?

```rust
    let ram_slice = core::slice::from_raw_parts_mut(ram_ptr, sdram_size / core::mem::size_of::<u32>());

    // this would be slow
    for elem in ram_slice.iter_mut() {
        *elem = 0;
    }
```