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pureboot: the device — one pure C++ source, 512 bytes, every chip

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No inline assembly, no global register variables; libavr does the
datasheet work. The device speaks primitives — flash read/page-program,
EEPROM read/write, fuse read, info block, EEPROM-resident activation
timeout, hand-over — and verify, erase, reset-vector surgery, and
timeout configuration live in the host tool. 490 B on the ATtiny13A,
510 B on the ATtiny85, 484 B on the ATmega328P, each linked into the
top 512 bytes of flash; per-chip size tests gate all three.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
BlackMark
2026-07-20 05:33:28 +02:00
parent 74d8b92885
commit 47990349a4
4 changed files with 515 additions and 10 deletions
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46
CMakePresets.json
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@@ -22,11 +22,35 @@
"name": "atmega328p-reflect",
"inherits": "base",
"cacheVariables": { "LIBAVR_MCU": "atmega328p", "LIBAVR_REFLECT": "ON" }
},
{
"name": "attiny85-generated",
"inherits": "base",
"cacheVariables": { "LIBAVR_MCU": "attiny85", "LIBAVR_REFLECT": "OFF" }
},
{
"name": "attiny85-reflect",
"inherits": "base",
"cacheVariables": { "LIBAVR_MCU": "attiny85", "LIBAVR_REFLECT": "ON" }
},
{
"name": "attiny13a-generated",
"inherits": "base",
"cacheVariables": { "LIBAVR_MCU": "attiny13a", "LIBAVR_REFLECT": "OFF" }
},
{
"name": "attiny13a-reflect",
"inherits": "base",
"cacheVariables": { "LIBAVR_MCU": "attiny13a", "LIBAVR_REFLECT": "ON" }
}
],
"buildPresets": [
{ "name": "atmega328p-generated", "configurePreset": "atmega328p-generated" },
{ "name": "atmega328p-reflect", "configurePreset": "atmega328p-reflect" }
{ "name": "atmega328p-reflect", "configurePreset": "atmega328p-reflect" },
{ "name": "attiny85-generated", "configurePreset": "attiny85-generated" },
{ "name": "attiny85-reflect", "configurePreset": "attiny85-reflect" },
{ "name": "attiny13a-generated", "configurePreset": "attiny13a-generated" },
{ "name": "attiny13a-reflect", "configurePreset": "attiny13a-reflect" }
],
"workflowPresets": [
{
@@ -36,9 +60,27 @@
{ "type": "build", "name": "atmega328p-generated" },
{ "type": "test", "name": "atmega328p-generated" }
]
},
{
"name": "attiny85-generated",
"steps": [
{ "type": "configure", "name": "attiny85-generated" },
{ "type": "build", "name": "attiny85-generated" },
{ "type": "test", "name": "attiny85-generated" }
]
},
{
"name": "attiny13a-generated",
"steps": [
{ "type": "configure", "name": "attiny13a-generated" },
{ "type": "build", "name": "attiny13a-generated" },
{ "type": "test", "name": "attiny13a-generated" }
]
}
],
"testPresets": [
{ "name": "atmega328p-generated", "configurePreset": "atmega328p-generated", "output": { "outputOnFailure": true } }
{ "name": "atmega328p-generated", "configurePreset": "atmega328p-generated", "output": { "outputOnFailure": true } },
{ "name": "attiny85-generated", "configurePreset": "attiny85-generated", "output": { "outputOnFailure": true } },
{ "name": "attiny13a-generated", "configurePreset": "attiny13a-generated", "output": { "outputOnFailure": true } }
]
}