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Add retained-RAM staging for nRF52 mOTA

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mikecarper
2026-09-05 12:08:21 -07:00
parent 23bf83277c
commit 49dcba5c6e
25 changed files with 2071 additions and 83 deletions
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scripts/nrf52_internal_bootloader_link.py
+32 -11
View File
@@ -1,9 +1,10 @@
"""Enable shared-slot internal bootloader update support on qualified nRF52840 targets.
The bootloader package uses the ordinary bottom-aligned internal OTA store
below 0xED000; no second linker reservation exists. This pre-script only binds
the feature macro to the exact release inventory and fails closed if a target
does not use the normal S140 v6/v7 1 MiB application layout.
below 0xED000. Qualified internal-only targets also use a dedicated linker that
reserves the top 64 KiB of SRAM for hybrid flash-prefix/RAM-suffix staging.
This pre-script binds both features to the exact release inventory and fails
closed if a target does not use the normal S140 v6/v7 1 MiB application layout.
"""
Import("env")
@@ -30,7 +31,10 @@ requested = (
if requested:
# The macro is injected here so direct PIO and build.sh synthetic aliases
# cannot silently differ. Package admission is runtime-capacity based.
env.AppendUnique(CPPDEFINES=["OTA_INTERNAL_BOOTLOADER_UPDATE"])
env.AppendUnique(CPPDEFINES=[
"OTA_INTERNAL_BOOTLOADER_UPDATE",
"OTA_HYBRID_RAM_STORE",
])
board = env.BoardConfig()
# Most variants inherit the framework's top-level ``build.ldscript``.
# A few otherwise ordinary Adafruit nRF52840 boards (notably Keepteen LT1)
@@ -40,17 +44,34 @@ if requested:
board.get("build.ldscript", "")
or board.get("build.arduino.ldscript", "")
)
linker_versions = {
"nrf52840_s140_v6.ld": "v6",
"nrf52840_s140_v7.ld": "v7",
}
# Compare the complete filename, not merely a suffix: a custom linker such
# as ``board_nrf52840_s140_v6.ld`` must not be mistaken for the qualified
# normal map and silently replaced with the mOTA layout.
current_name = current.replace("\\", "/").rsplit("/", 1)[-1]
suffix = linker_versions.get(current_name)
mcu = str(board.get("build.mcu", "")).lower()
if mcu != "nrf52840" or not (
current.endswith("nrf52840_s140_v6.ld")
or current.endswith("nrf52840_s140_v7.ld")
):
if mcu != "nrf52840" or suffix is None:
raise RuntimeError(
"shared-slot bootloader update requires an nRF52840 with the normal "
f"S140 v6/v7 non-ExtraFS linker; found mcu={mcu or 'none'} "
f"linker={current or 'none'}"
)
print(
"nRF52 shared-slot bootloader update: normal linker %s; runtime EndF headroom required"
% current
mota_linker = Path(env["PROJECT_DIR"]) / "boards" / (
"nrf52840_s140_%s_mota64.ld" % suffix
)
if not mota_linker.is_file():
raise RuntimeError("missing mOTA hybrid linker: %s" % mota_linker)
# The framework builder normally resolves LDSCRIPT_PATH from BoardConfig.
# Set both so this remains deterministic whether PlatformIO invokes this
# pre-script before or after that framework step.
board.update("build.ldscript", str(mota_linker))
env.Replace(LDSCRIPT_PATH=str(mota_linker))
print(
"nRF52 shared-slot bootloader update: %s; fixed 64 KiB mOTA RAM arena; runtime EndF headroom required"
% mota_linker.name
)