Add full firmware install via UART + TFTP

[widgetii]

Summary

• Add defib install command that flashes a complete OpenIPC firmware (U-Boot + kernel + rootfs) to NOR flash via UART boot ROM + TFTP
• Extend TFTP server to support multiple files with filename-based routing
• CRC32 verification at every step: after TFTP transfer in RAM, and after flash write (read-back)

How it works

defib install -c hi3516ev300 \
  --firmware openipc.hi3516ev300-nor-lite.tgz \
  -p /dev/uart-IVG85HG50PYA-S \
  --power-cycle --nor-size 8

1. Extracts tarball, verifies MD5 checksums
2. Downloads U-Boot from OpenIPC (cached)
3. Burns U-Boot to RAM via HiSilicon boot ROM protocol
4. Breaks into U-Boot console (Ctrl-C)
5. Starts multi-file TFTP server with U-Boot, kernel, and rootfs
6. Sends U-Boot commands: setenv networking → tftpboot → sf erase → sf write for each partition
7. CRC32 verifies each partition in RAM and after flash write
8. Runs setnor8m/setnor16m, saveenv, reset

TFTP multi-file support

TFTPServerProtocol now accepts files: dict[str, bytes] for filename-based routing. U-Boot requests each file by name (tftpboot 0x42000000 uImage.hi3516ev300), and the server serves the matching data. Backward compatible — single-file mode still works.

Test plan

• 301 unit tests pass (4 new multi-file TFTP tests)
• Tested on real hi3516ev300 (IVG85HG50PYA-S) with 16MB W25Q128 NOR
• CRC32 verified: U-Boot 4B3C3231, kernel 4210590F, rootfs 389C689C
• OpenIPC Linux boots successfully (squashfs mounted, services started)
• PoE power cycling via CRS112-8P-4S

🤖 Generated with Claude Code