build: Bump uart_16550 from 0.4.0 to 0.8.0

[dependabot]

Bumps uart_16550 from 0.4.0 to 0.8.0.

Release notes

Sourced from uart_16550's releases.

v0.8.0

What's Changed

• config: disable interrupts by default + document interrupt behavior of init() by @​phip1611 in rust-osdev/uart_16550#69

Full Changelog: rust-osdev/uart_16550@v0.7.0...v0.8.0

v0.6.0

What's Changed

• Rename byte transfer functions and update IO trait implementations by @​phip1611 in rust-osdev/uart_16550#49
• Enhance MmioAddress safety and fix AArch64 instruction emission by @​phip1611 in rust-osdev/uart_16550#50
• Improve documentation examples and streamline architecture support by @​phip1611 in rust-osdev/uart_16550#53
• Add API test and improve memory safety in MMIO constructors by @​phip1611 in rust-osdev/uart_16550#54

Full Changelog: rust-osdev/uart_16550@v0.5.0...v0.6.0

v0.5.0 (rewrite of the crate!)

• Complete rewrite of the crate
• The crate is by no means "minimalist" anymore. Now, uart_16550, is a simple yet highly configurable low-level driver for 16550 UART devices, typically known and used as serial ports or COM ports. Easy integration into Rust while providing fine-grained control where needed (e.g., for kernel drivers).
• Changes were made to use this on real hardware
• Common API for x86 port I/O and MMIO
• 100% typed spec

We thank all past contributors. We've decided to completely rewrite the crate to clean up technical debt from the past, maintain the highest possible coding and API standards, and to make this crate ready for usage on real hardware, while keeping it easy to use in virtual machines.

Special Thanks

Special Thanks to Philipp Oppermann (@​phil-opp) and Martin Kröning (@​mkroening) for their very valuable review on the new crate!

Migration to v0.5.0

Old

use uart_16550::SerialPort;
const SERIAL_IO_PORT: u16 = 0x3F8;
let mut serial_port = unsafe { SerialPort::new(SERIAL_IO_PORT) };
serial_port.init();
// Now the serial port is ready to be used. To send a byte:
</tr></table>

... (truncated)

Changelog

Sourced from uart_16550's changelog.

0.8.0 - 2026-08-16

• Breaking: Config::default() now disables all interrupts by default (was IER::DATA_READY).
• Made Uart16550::init() enable configured interrupts only at the end. Also documented when interrupts can still become pending.

0.7.0 - 2026-08-15

• Breaking: Changed the return type of Uart16550::config(&self) from (&Config, &B::Address) to (&Config, &B)
• Breaking: ready_to_send() (and send_bytes() in turn) doesn't check MSR::CTS anymore by default, as modern hardware tends to leave that pin disconnected. This behavior is configurable through Config::check_cts_before_sending. Additionally, for manual checks, users can check if device.msr().contains(MSR::CTS) {}.

0.6.0 - 2026-03-28

• Rename Uart16550::try_send_bytes() to Uart16550::send_bytes()
• Rename Uart16550::try_receive_bytes() to Uart16550::receive_bytes()
• New public methods:
  • Uart16550::ready_to_receive()
  • Uart16550::ready_to_send()
• Documentation improvements
• Internal safety fixes (there was no UB, just making the internal code more robust)
• Uart16550::new_mmio() and Uart16550Ttty::new_mmio() now accept a NonNull<u8> instead of a *mut u8. The recommended way to construct the MMIO address is to use:

  fn main() {
    // External MMIO address.
    let mmio_address = ptr::with_exposed_provenance_mut::<u8>(0x1000);
    let mmio_address = NonNull::new(mmio_address).unwrap();
    let mut uart = unsafe { Uart16550::new_mmio(mmio_address, 4).unwrap() };
  }

0.5.0 - 2026-03-20

• Complete rewrite of the crate
• The crate is by no means "minimalist" anymore. Now, uart_16550, is a simple yet highly configurable low-level driver for 16550 UART devices, typically known and used as serial ports or COM ports. Easy integration into Rust while providing fine-grained control where needed (e.g., for kernel drivers).
• Changes were made to use this on real hardware
• Common API for x86 port I/O and MMIO
• 100% typed spec

... (truncated)

Commits

• 176b07b Merge pull request #69 from phip1611/interrupts-fixes
• 6b314f3 chore: v0.8.0
• 37b3f3e uart: make init() more robust against invalid device state
• e73f64c uart: enable interrupts last in Uart16550::init()
• 82ad27a doc: document more side effects
• 72a1534 config: disable interrupts by default
• 7d813b1 chore: prepare v0.7.0
• e7a9822 Merge pull request #68 from phip1611/doc
• 114d2ec doc: tighten CTS/hardware flow control wording
• 88a0674 doc: tighten cts/hw control flow wording
• Additional commits viewable in compare view

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