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pureboot: host tool and end-to-end protocol tests, all three chips

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pureboot.py (Python stdlib only): images as raw binary or Intel HEX,
flash and EEPROM programming with read-back verify, erase composites,
fuse and info readout, activation-timeout configuration, and the
tinies' reset-vector surgery — the trampoline word below the loader,
page 0 written last.

The test spawns a simavr device (pureboot_device.c) — the mega's USART
as a pty; on the tinies a cycle-timed GPIO<->pty bridge for the polled
software UART plus the NVM module simavr's tiny cores lack (their SPM
opcode ioctls into a void and silently does nothing) — and drives it
with the real tool: knock from reset (erased-flash walk on the tinies),
program and verify both memories, timeout write, session reconnect, an
external reset through the patched vector, hand-over, and the fixture
application's banner. Results are cross-checked against ground-truth
memory dumps and an independent decode of the surgery's rjmp words,
red-verified against a sabotaged encoder.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
BlackMark
2026-07-20 05:54:15 +02:00
parent 47990349a4
commit 2133627057
7 changed files with 1061 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

57
CMakeLists.txt
View File

@@ -25,16 +25,28 @@ if(PROJECT_IS_TOP_LEVEL)
# Python are missing, only the size tests run.
find_program(_host_cc NAMES cc gcc)
find_package(Python3 COMPONENTS Interpreter)
if(_host_cc AND Python3_FOUND AND LIBAVR_MCU STREQUAL "atmega328p")
set(TSB_DEVICE ${CMAKE_BINARY_DIR}/tsb_device)
if(_host_cc AND Python3_FOUND)
set(PB_DEVICE ${CMAKE_BINARY_DIR}/pureboot_device)
execute_process(
COMMAND ${_host_cc} -O2 -I/usr/include/simavr -I/usr/include/simavr/parts
-o ${TSB_DEVICE} ${CMAKE_CURRENT_SOURCE_DIR}/test/device.c
-lsimavr -lsimavrparts -lelf
RESULT_VARIABLE _dev_res ERROR_VARIABLE _dev_err)
if(NOT _dev_res EQUAL 0)
message(STATUS "tsb_device not built (${_dev_err}) — protocol tests skipped")
unset(TSB_DEVICE)
-o ${PB_DEVICE} ${CMAKE_CURRENT_SOURCE_DIR}/test/pureboot_device.c
-lsimavr -lsimavrparts -lelf -lutil
RESULT_VARIABLE _pbdev_res ERROR_VARIABLE _pbdev_err)
if(NOT _pbdev_res EQUAL 0)
message(STATUS "pureboot_device not built (${_pbdev_err}) — protocol tests skipped")
unset(PB_DEVICE)
endif()
if(LIBAVR_MCU STREQUAL "atmega328p")
set(TSB_DEVICE ${CMAKE_BINARY_DIR}/tsb_device)
execute_process(
COMMAND ${_host_cc} -O2 -I/usr/include/simavr -I/usr/include/simavr/parts
-o ${TSB_DEVICE} ${CMAKE_CURRENT_SOURCE_DIR}/test/device.c
-lsimavr -lsimavrparts -lelf
RESULT_VARIABLE _dev_res ERROR_VARIABLE _dev_err)
if(NOT _dev_res EQUAL 0)
message(STATUS "tsb_device not built (${_dev_err}) — protocol tests skipped")
unset(TSB_DEVICE)
endif()
endif()
endif()
endif()
@@ -109,12 +121,24 @@ endif()
if(LIBAVR_MCU STREQUAL "attiny13a")
set(_pb_flash 1024)
set(_pb_wrap "")
set(_pb_page 32)
set(_pb_hz 9600000)
set(_pb_baud 57600)
set(_pb_eeprom 64)
elseif(LIBAVR_MCU STREQUAL "attiny85")
set(_pb_flash 8192)
set(_pb_wrap -Wl,--pmem-wrap-around=8k)
set(_pb_page 64)
set(_pb_hz 8000000)
set(_pb_baud 57600)
set(_pb_eeprom 512)
else()
set(_pb_flash 32768)
set(_pb_wrap -Wl,--pmem-wrap-around=32k)
set(_pb_page 128)
set(_pb_hz 16000000)
set(_pb_baud 115200)
set(_pb_eeprom 1024)
endif()
math(EXPR _pb_base "${_pb_flash} - 512")
math(EXPR _pb_base_hex "${_pb_base}" OUTPUT_FORMAT HEXADECIMAL)
@@ -133,4 +157,21 @@ if(PROJECT_IS_TOP_LEVEL)
add_test(NAME pureboot.size
COMMAND ${CMAKE_COMMAND} -DSIZE_TOOL=${CMAKE_SIZE} -DELF=$<TARGET_FILE:pureboot>
-DLIMIT=512 -P ${CMAKE_CURRENT_SOURCE_DIR}/test/check_size.cmake)
# The protocol test flashes this fixture through the loader with the real
# host tool and expects its banner after the hand-over; a normally linked
# application whose reset vector is what the tinies' surgery re-homes.
if(DEFINED PB_DEVICE)
add_executable(pbapp test/pbapp.cpp)
target_link_libraries(pbapp PRIVATE libavr)
add_custom_command(TARGET pbapp POST_BUILD
COMMAND ${CMAKE_OBJCOPY} -O binary $<TARGET_FILE:pbapp> $<TARGET_FILE:pbapp>.bin)
add_test(NAME pureboot.protocol
COMMAND ${Python3_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/test/pbtest.py
${PB_DEVICE} $<TARGET_FILE:pureboot> ${LIBAVR_MCU} ${_pb_hz} ${_pb_base_hex}
${_pb_page} ${_pb_baud} ${_pb_eeprom} $<TARGET_FILE:pbapp>.bin
${CMAKE_CURRENT_SOURCE_DIR}/pureboot/pureboot.py
${CMAKE_BINARY_DIR}/pbtest-work)
set_tests_properties(pureboot.protocol PROPERTIES TIMEOUT 180)
endif()
endif()