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pureboot 4: the loader carries its fixes' identity

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The unaligned-W and U2X-hand-over fixes change the loader's observable
on-wire behavior, and the --stay reconnect fix changes the host tool, so
both move: loader version 3 -> 4, tool VERSION 2 -> 3. The protocol and info
block are unchanged, so OLDEST_LOADER stays 1.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
BlackMark
2026-07-23 01:09:38 +02:00
parent 11707e0b06
commit 98a3be3c2e
2 changed files with 3 additions and 3 deletions
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2
pureboot/pureboot.cpp
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@@ -67,7 +67,7 @@ constexpr std::uint8_t timeout_seconds = PUREBOOT_TIMEOUT;
// The loader's one identity number. The protocol carries none of its own — // The loader's one identity number. The protocol carries none of its own —
// a version implies it, and the host tool holds that map (README.md). // a version implies it, and the host tool holds that map (README.md).
constexpr std::uint8_t version = 3; constexpr std::uint8_t version = 4;
// The 'b' reply, byte for byte (layout: README.md). Flash-resident because // The 'b' reply, byte for byte (layout: README.md). Flash-resident because
// no crt copies a .data image — and flash_table's storage carries the word // no crt copies a .data image — and flash_table's storage carries the word

4
pureboot/pureboot.py
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@@ -24,13 +24,13 @@ else:
import termios import termios
PROMPT = b"+" PROMPT = b"+"
VERSION = 2 # this tool's own version — free to drift from a loader's VERSION = 3 # this tool's own version — free to drift from a loader's
# The loader versions this tool speaks. A pureboot version implies its wire # The loader versions this tool speaks. A pureboot version implies its wire
# protocol, which carries no number of its own, so this window is where that # protocol, which carries no number of its own, so this window is where that
# map lives: every version so far speaks the same protocol, and one that # map lives: every version so far speaks the same protocol, and one that
# changes it becomes the new floor here. # changes it becomes the new floor here.
OLDEST_LOADER = 1 OLDEST_LOADER = 1
NEWEST_LOADER = 3 NEWEST_LOADER = 4
SLOT = 512 # the loader slot, on every chip SLOT = 512 # the loader slot, on every chip
RETRIES = 3 # rewrites of a page that reads back wrong, before the run stops RETRIES = 3 # rewrites of a page that reads back wrong, before the run stops