v0.1.0

Added

• The loader firmware: a self-relocating UART command agent for the
  Raspberry Pi 2, 3 and 4 that stays resident and services commands, so
  the SD card is rewritten only to re-flash the loader itself. Builds for
  AArch32 (kernel7.img) and AArch64 (kernel8.img), for BCM2837 and
  BCM2711.
• mem-write, exec, and boot for getting an image into memory and
  running it, with CRC-checked chunks and per-chunk retries.
• sd-list, sd-read, sd-write, sd-delete, and sd-mkdir for
  working with the SD card's FAT boot partition over the same link.
• A bidirectional terminal, so a kernel that prompts for input can be
  driven. Ctrl-] exits; every other key, Ctrl-C included, reaches the
  device.
• list, which reports the host's USB serial ports without opening one.
• The host CLI in Rust, published to crates.io as rpi-loader.

Images

Copy the image matching your board to the SD card's boot
partition, renamed to kernel7.img (32-bit) or kernel8.img
(64-bit) -- the firmware loads those names and no others. Use
kernel8.img only with arm_64bit=1 in config.txt.

bcm2837 covers the Pi 2 v1.2 and Pi 3; bcm2711 covers the
Pi 4. Verify with sha256sum -c SHA256SUMS.

The host CLI is a separate install: cargo install rpi-loader.