BlackMark
e4390d2ba8
The pin crosses libavr's phase 6 - the renamed system surface, the named serial configs, the receiver-tolerance table, the paged SPM receipts - and every loader image comes out size-identical: the full matrix on six representative chips (the exhaustive cross product on three of them), the stock and autobaud columns untouched, the four tsb tiers back on their recorded floors at 510/526/638/836. Byte parity was not free, and the two libavr defects it surfaced were fixed there rather than absorbed here. The EEPROM write procedure's step 2 - the SPMEN spin - had landed unconditionally and cost every build six bytes for a wait a polled loader can never take; it is scoped now, and the loaders state the datasheet's own omission clause (spm_interlock::omitted, DS40002061B 8.6.3). The blocking page erase/write grew an internal wait the tiers' settle() already provides, so the tiers issue the command form and pureboot keeps its host-driven sp_spm path. What the port states rather than inherits: the stock 115200 at 16 MHz sits +2.1 % past the receiver-tolerance table libavr now holds rates to, so the hardware links say .allow_baud_error = true - the same 2.5 % envelope pureboot_baud_feasible() has always enforced, proven on silicon across the fleet. rx_ready() reads readable() now. Alongside the pin: rule 33's ASCII sweep over every source (docs keep their typography), rule 34's InsertBraces in .clang-format with the tree reformatted, std::array over the simavr runners' raw buffers, and the stale Studio size in ide/README.md replaced by the claim its check-flags gate actually holds. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
37 lines
1.5 KiB
CMake
37 lines
1.5 KiB
CMake
# Asserts the autobaud loader's measured unit sits where the host will read
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# it (--info's measured clock - the address is wire contract). Two homes: on
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# a chip with the GPIOR pair the unit lives there and the image must carry no
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# RAM word for it at all; elsewhere it is the first RAM object at SRAM start.
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# Run as
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# cmake -DOBJDUMP=... -DELF=... -DRAM_START=<data address> [-DGPIOR=<data address>]
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# -P check_unit.cmake
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execute_process(COMMAND ${OBJDUMP} -t ${ELF} OUTPUT_VARIABLE _syms RESULT_VARIABLE _res)
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if(NOT _res EQUAL 0)
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message(FATAL_ERROR "${OBJDUMP} -t ${ELF} failed")
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endif()
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# The symbol line: "00800100 l O .noinit 00000002 <mangled>unit_E".
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string(REGEX MATCH "\n0*([0-9a-f]+)[^\n]+[ \t][^ \t\n]*unit_E\n" _line "${_syms}")
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if(GPIOR)
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if(_line)
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message(FATAL_ERROR "unit_ RAM symbol present although the unit's home is GPIOR ${GPIOR} - "
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"the host peeks the pair, and a RAM copy would be dead weight")
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endif()
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message(STATUS "no unit_ RAM object - the unit lives in the GPIOR pair at ${GPIOR}")
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return()
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endif()
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if(NOT _line)
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message(FATAL_ERROR "no unit_ symbol in ${ELF} - is this the autobaud loader?")
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endif()
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# AVR data-space symbols carry the 0x800000 VMA offset.
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math(EXPR _want "0x800000 + ${RAM_START}" OUTPUT_FORMAT HEXADECIMAL)
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math(EXPR _have "0x${CMAKE_MATCH_1}" OUTPUT_FORMAT HEXADECIMAL)
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if(NOT _have STREQUAL _want)
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message(FATAL_ERROR "unit_ sits at ${_have}, ram_start is ${_want} - the host peeks ram_start")
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endif()
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message(STATUS "unit_ at ${_have} == ram_start")
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