Function esp_rom_spiflash_write

pub unsafe extern "C" fn esp_rom_spiflash_write(
    dest_addr: u32,
    data: *const u32,
    len: u32,
) -> i32

Available on crate feature unstable only.

Write Data to Flash, you should Erase it yourself if need.

dest_addr should be 4 bytes aligned. len should be 4 bytes aligned.