mirror of
https://github.com/mikecarper/MeshCore.git
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60 lines
1.9 KiB
Python
60 lines
1.9 KiB
Python
"""Build-local fix for the nRF52 InternalFS SoftDevice flash wait.
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GCC 14/LTO can treat the naked SVC wrapper as not writing through its pointer
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argument. It then folds wait_for_async_flash_op_completion() into an immediate
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success return, allowing LittleFS to read or rewrite a page before the async
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erase/program has completed. Keep the SoftDevice state volatile and add a
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compiler barrier after the SVC call. Do not modify PlatformIO's shared SDK.
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"""
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from pathlib import Path
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OLD_WAIT = """ uint8_t sd_en = 0;
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(void) sd_softdevice_is_enabled(&sd_en);
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if (sd_en) {
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"""
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FIXED_WAIT = """ volatile uint8_t sd_en = 0;
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(void) sd_softdevice_is_enabled((uint8_t*) &sd_en);
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__asm volatile ("" ::: "memory");
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if (sd_en) {
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"""
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def patched_source(source):
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source = source.replace("\r\n", "\n")
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if FIXED_WAIT in source and OLD_WAIT not in source:
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return source
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if source.count(OLD_WAIT) != 1:
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raise RuntimeError(
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"nRF52 flash fix: unrecognized InternalFS flash driver; review "
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"the framework update before building (shared SDK not modified)"
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)
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return source.replace(OLD_WAIT, FIXED_WAIT)
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def replace_driver(build_env, node):
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source = Path(node.srcnode().get_abspath())
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patched = patched_source(source.read_text(encoding="utf-8"))
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build_env.AppendUnique(CPPPATH=[str(source.parent)])
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destination = Path(build_env.subst("$BUILD_DIR")) / "patched-nrf52-flash" / source.name
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destination.parent.mkdir(parents=True, exist_ok=True)
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if not destination.exists() or destination.read_text(encoding="utf-8") != patched:
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destination.write_text(patched, encoding="utf-8")
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print("nRF52 flash: build-local SoftDevice completion wait fix enabled")
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return build_env.File(str(destination))
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def install(build_env):
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build_env.AddBuildMiddleware(
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replace_driver,
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"*InternalFileSytem*src*flash*flash_nrf5x.c",
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)
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if "Import" in globals():
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Import("env")
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install(env)
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