BlackMark
a285347e5f
R/r/w/F collapse into G and g over a selector byte naming the space — flash,
EEPROM, data, fuse, SPM — with the flash bank in its high nibble. Four command
bodies, four transfer loops and four argument decodes become one of each, and
W joins the same decode instead of keeping an address form of its own. The
loader shrinks while gaining everything below: on the 1284P the stock build
goes 480 -> 432 B and the software one 496 -> 450.
What the freed space buys:
- Data space. On AVR one pointer spans SRAM, the register file and the whole
I/O space, so G over space 2 reads all three. pureboot keeps zero static
RAM and pushes no register, so at loader entry an application's SRAM is
still what the application left there — this is a post-mortem, not just a
poke hole. As its own command it needed a dispatch arm and a loop; as one
more space it is a single ld/st.
- Host-issued SPM. W fills the page buffer and stops; erase, write and RWW
re-enable are writes to space 4, which reach the same fused store-and-SPM
pair through the transfer's own address and data. Any SPM operation, lock
bits included, is now reachable and the loader carries no page-commit logic.
The four-cycle SPMCSR-to-SPM window is why that primitive stays fused: no
host can hit it across a serial link, and that — not the byte count — is
the floor on how low-level a bootloader's primitives can go.
- Byte addresses everywhere. The bank in the selector retires the
word-addressed wire the >64 KiB parts needed, so the 1284s stop being the
outlier.
SERIAL autobaud is a third backend on the same loader, over libavr's
software_autobaud: no clock, no baud, one binary per chip for every F_CPU and
every rate. Activation counts poll iterations rather than seconds and bounds
every wait, so a stray pulse cannot hold an unattended device.
b answers with the version and signature only; the host derives geometry from
the signature, which is what an autobaud build requires anyway. An update image
is a bare slot with no device to ask, so every image carries a six-byte stamp —
the same bytes b answers with, and the source of both — that the loader never
reads from flash and the host refuses to install a mismatch against. The
running-slot write guard moved onto the SPM commit, which covers erase and
write both where guarding W covered neither directly.
The position-independence lint now proves the property instead of a proxy for
it: the image must come out byte-identical linked at a different base.
-fno-move-loop-invariants left the tuned flag set — it was fitted to a command
loop carrying four transfer bodies and costs bytes now that it carries one.
Verified: the exhaustive matrix on all 37 chips (every clock x every baud x
every backend, non-standard rates included, plus the autobaud build) —
8174 size checks, no failures, tightest fit the 1284s' autobaud at 510 of 512.
Behavioral suites green on every chip class: t13a 10/10, t85 11/11, m8 13/13,
m16a 13/13, m48pa 13/13, 328P 23/23, 644A 17/17, 1284P 17/17. Data-space
round trip through --peek/--poke and the autobaud handshake are both red-green
proven.
The two prototype sources and their findings file go; the README carries the
protocol and dev/done.md in libavr carries the reasoning.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
361 lines
18 KiB
Python
361 lines
18 KiB
Python
#!/usr/bin/env python3
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"""Host-tool unit tests — the planning and policy logic, no simulator:
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programming orders and their recovery properties, the reset-vector surgery,
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the staging composition, the boot-fuse decode, and the update preflight over
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fuse combinations simavr cannot model.
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Usage: test_planner.py <tool_py>
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"""
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import sys
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def fail(message):
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print(f"FAIL: {message}")
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sys.exit(1)
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def expect_error(what, fn, *needles):
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try:
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fn()
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except Exception as error:
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for needle in needles:
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if needle not in str(error):
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fail(f"{what}: error lacks {needle!r}: {error}")
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return
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fail(f"{what}: no error raised")
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def info_of(pb, base, page, patch, flash, signature=(0x1E, 0x93, 0x0B), word_flash=False, version=None):
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scale = 2 if word_flash else 1
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wire_base = base // scale
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flags = (1 if patch else 0) | (2 if word_flash else 0)
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# The EEPROM size comes from the signature, as it must: pureboot 5 derives
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# the whole geometry from the signature rather than sending it, so a
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# synthetic block that disagreed with its own signature would describe a
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# chip that cannot exist.
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eeprom = pb.CHIP_GEOMETRY[signature][2]
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raw = bytes((0x50, 0x42, pb.NEWEST_LOADER if version is None else version,
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*signature, page & 0xFF, wire_base & 0xFF, wire_base >> 8,
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eeprom & 0xFF, eeprom >> 8, flags))
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info = pb.Info(raw)
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if info.flash_size != flash:
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fail(f"info_of({base:#x}) decodes to {info.flash_size:#x} of flash, not {flash:#x}")
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return info
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def rjmp_decode(word, at, flash_words):
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if word & 0xF000 != 0xC000:
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fail(f"not an rjmp: {word:#06x}")
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offset = word & 0x0FFF
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if offset >= 0x800:
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offset -= 0x1000
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return (at + 1 + offset) % flash_words
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def main():
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import os
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sys.path.insert(0, os.path.dirname(os.path.abspath(sys.argv[1])))
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import pureboot as pb
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tiny = info_of(pb, 0x1E00, 64, True, 0x2000)
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mega = info_of(pb, 0x7E00, 128, False, 0x8000, signature=(0x1E, 0x95, 0x0F))
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# Versioning: the block's third byte is the loader's version, and the tool
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# speaks a window of them. Every version in the window decodes, so an older
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# deployed loader stays usable; one above the window is refused by name,
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# since which version changed the protocol is knowledge only the tool
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# holds, and it holds none about a version it has never heard of.
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for version in range(pb.OLDEST_LOADER, pb.NEWEST_LOADER + 1):
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if info_of(pb, 0x1E00, 64, True, 0x2000, version=version).version != version:
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fail(f"pureboot {version} does not decode")
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expect_error(
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"unknown loader version",
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lambda: info_of(pb, 0x1E00, 64, True, 0x2000, version=pb.NEWEST_LOADER + 1),
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f"pureboot {pb.NEWEST_LOADER + 1}",
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"newer tool",
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)
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# mega_boot: BOOTSZ words and the BOOTRST sense per chip — the fuse byte
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# index (EXTENDED on the x8 line except the m328s' HIGH, HIGH elsewhere)
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# and the per-family ladders (Atmel-2486/2466/2503/2545/8271/DS40002065/
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# 8272/8011/2593/42719). Synthetic 'F' replies: only the boot byte
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# carries meaning.
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cases = (
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((0x1E, 0x93, 0x07), 0x2000, 3, {0b11: 0x1F00, 0b10: 0x1E00, 0b01: 0x1C00, 0b00: 0x1800}), # m8
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((0x1E, 0x94, 0x03), 0x4000, 3, {0b11: 0x3F00, 0b10: 0x3E00, 0b01: 0x3C00, 0b00: 0x3800}), # m16
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((0x1E, 0x95, 0x02), 0x8000, 3, {0b11: 0x7E00, 0b10: 0x7C00, 0b01: 0x7800, 0b00: 0x7000}), # m32
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((0x1E, 0x93, 0x0A), 0x2000, 2, {0b11: 0x1F00, 0b10: 0x1E00, 0b01: 0x1C00, 0b00: 0x1800}), # m88
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((0x1E, 0x93, 0x0F), 0x2000, 2, {0b11: 0x1F00, 0b10: 0x1E00, 0b01: 0x1C00, 0b00: 0x1800}), # m88P
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((0x1E, 0x94, 0x06), 0x4000, 2, {0b11: 0x3F00, 0b10: 0x3E00, 0b01: 0x3C00, 0b00: 0x3800}), # m168/168A
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((0x1E, 0x94, 0x0B), 0x4000, 2, {0b11: 0x3F00, 0b10: 0x3E00, 0b01: 0x3C00, 0b00: 0x3800}), # m168P
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((0x1E, 0x95, 0x14), 0x8000, 3, {0b11: 0x7E00, 0b10: 0x7C00, 0b01: 0x7800, 0b00: 0x7000}), # m328
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((0x1E, 0x95, 0x0F), 0x8000, 3, {0b11: 0x7E00, 0b10: 0x7C00, 0b01: 0x7800, 0b00: 0x7000}), # m328P
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((0x1E, 0x94, 0x0F), 0x4000, 3, {0b11: 0x3F00, 0b10: 0x3E00, 0b01: 0x3C00, 0b00: 0x3800}), # m164A
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((0x1E, 0x94, 0x0A), 0x4000, 3, {0b11: 0x3F00, 0b10: 0x3E00, 0b01: 0x3C00, 0b00: 0x3800}), # m164P
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((0x1E, 0x95, 0x15), 0x8000, 3, {0b11: 0x7E00, 0b10: 0x7C00, 0b01: 0x7800, 0b00: 0x7000}), # m324A
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((0x1E, 0x96, 0x09), 0x10000, 3, {0b11: 0xFC00, 0b10: 0xF800, 0b01: 0xF000, 0b00: 0xE000}), # m644
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((0x1E, 0x96, 0x0A), 0x10000, 3, {0b11: 0xFC00, 0b10: 0xF800, 0b01: 0xF000, 0b00: 0xE000}), # m644P
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((0x1E, 0x97, 0x06), 0x20000, 3, {0b11: 0x1FC00, 0b10: 0x1F800, 0b01: 0x1F000, 0b00: 0x1E000}), # 1284
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((0x1E, 0x97, 0x05), 0x20000, 3, {0b11: 0x1FC00, 0b10: 0x1F800, 0b01: 0x1F000, 0b00: 0x1E000}), # 1284P
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)
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for signature, flash, which, ladder in cases:
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chip = info_of(pb, flash - pb.SLOT, 128 if flash < 0x20000 else 0, False, flash,
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signature=signature, word_flash=flash > 0x10000)
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for bits, start in ladder.items():
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fuses = bytearray((0xFF, 0xFF, 0xFF, 0xFF))
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fuses[which] = (0xF8 | (bits << 1)) & ~1
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prog, at = pb.mega_boot(chip, bytes(fuses))
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if not prog or at != start:
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fail(f"mega_boot {signature[1]:02x}{signature[2]:02x} BOOTSZ={bits:02b} programmed: {prog} {at:#07x}")
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fuses[which] |= 1
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prog, at = pb.mega_boot(chip, bytes(fuses))
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if prog or at != start:
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fail(f"mega_boot {signature[1]:02x}{signature[2]:02b} unprogrammed: {prog} {at:#07x}")
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# Word-addressed info decode: the 1284P's base and page ride the wire
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# scaled — a 17-bit base halved into the block's two bytes, a 256-byte page
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# spelled 0 — and its slot is the same 512 bytes as everywhere else, so its
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# staging slot lands inside the 1 KiB minimum boot section.
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big = info_of(pb, 0x1FE00, 0, False, 0x20000, signature=(0x1E, 0x97, 0x05), word_flash=True)
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if big.page != 256 or big.base != 0x1FE00 or big.stage != 0x1FC00:
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fail(f"word-addressed info decode: page {big.page}, base {big.base:#x}, stage {big.stage:#x}")
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# Surgery: word 0 lands on the loader, the trampoline on the original
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# entry — checked with an independent decoder.
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app = bytes((0xC0 | 0x00, 0xC0)) + bytes((0x12,)) * 300 # rjmp .+0x00C0... entry word 0xC0C0
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entry = rjmp_decode(app[0] | (app[1] << 8), 0, tiny.flash_size // 2)
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pages = pb.plan_flash(app, tiny)
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word0 = pages[0][0] | (pages[0][1] << 8)
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if rjmp_decode(word0, 0, tiny.flash_size // 2) != tiny.base // 2:
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fail("surgery: patched word 0 misses the loader")
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tp = pages[tiny.base - 64]
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tramp = tp[62] | (tp[63] << 8)
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if rjmp_decode(tramp, (tiny.base - 2) // 2, tiny.flash_size // 2) != entry:
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fail("surgery: trampoline misses the original entry")
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expect_error("non-rjmp vector", lambda: pb.plan_flash(bytes((0x0C, 0x94)) + app[2:], tiny), "not an rjmp")
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looped = bytearray(app)
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word = pb.rjmp_to(0, tiny.base // 2, tiny.flash_size // 2)
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looped[0], looped[1] = word & 0xFF, word >> 8
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expect_error("read-back image", lambda: pb.plan_flash(bytes(looped), tiny), "read-back")
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expect_error("oversize image", lambda: pb.plan_flash(bytes(0x1DFF), tiny), "application flash ends")
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# Ordering: patched vector puts page 0 first and the trampoline second;
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# a boot section puts page 0 last. Blank pages drop only when erased.
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order = pb.covered(pages, tiny, skip_blank=False)
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if order[0] != 0 or order[1] != tiny.base - 64:
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fail(f"tiny order starts {order[:2]}, want page 0 then trampoline page")
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if sorted(order[2:]) != order[2:]:
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fail("tiny order tail not ascending")
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mega_pages = pb.plan_flash(bytes((0xFF,)) * 600, mega)
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morder = pb.covered(mega_pages, mega, skip_blank=False)
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if morder[-1] != 0 or sorted(morder[:-1]) != morder[:-1]:
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fail(f"mega order {morder}, want ascending with page 0 last")
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blanky = {0: pages[0], 64: bytes((0xFF,)) * 64, 128: pages[128], tiny.base - 64: tp}
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slim = pb.covered(blanky, tiny, skip_blank=True)
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if 64 in slim or 0 not in slim or tiny.base - 64 not in slim:
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fail(f"skip_blank order wrong: {slim}")
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# Staging content: the identical image plus the through-word on a
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# patched-vector chip; hard size clamps either way.
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image = bytes(range(256)) * 2 # 512 B — too big for a tiny slot
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expect_error("tiny staging size", lambda: pb.staging_content(image, tiny), "510")
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staged = pb.staging_content(image[:508], tiny)
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through = staged[510] | (staged[511] << 8)
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if rjmp_decode(through, (tiny.base - 2) // 2, tiny.flash_size // 2) != tiny.base // 2:
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fail("through-word misses the resident base")
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if pb.staging_content(image, mega) != image:
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fail("mega staging content should be the bare image")
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expect_error("mega staging size", lambda: pb.staging_content(image + b"!", mega), "512")
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# The image stamp: found in a synthetic binary, absent in noise. pureboot
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# 5 stamps the magic, its version and the signature, and the geometry is
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# looked up from there — so what comes back must equal what a live device
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# of the same chip reports.
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stamp = bytes((0x50, 0x42, pb.NEWEST_LOADER)) + bytes(tiny.signature)
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binary = bytes((0xAA,)) * 10 + stamp + bytes((0xBB,)) * 10
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found = pb.image_info(binary)
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if found is None or found.raw != tiny.raw:
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fail(f"image_info misreads the v{pb.NEWEST_LOADER} stamp: "
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f"{found.raw.hex() if found else None} != {tiny.raw.hex()}")
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if pb.image_info(bytes((0xAA,)) * 40) is not None:
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fail("image_info invents a block")
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# An older loader's image stays readable, so a deployed build can be
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# identified and installed like any other.
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old = info_of(pb, 0x1E00, 64, True, 0x2000, version=pb.OLDEST_LOADER)
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found_old = pb.image_info(bytes((0xAA,)) * 10 + old.raw)
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if found_old is None or found_old.version != pb.OLDEST_LOADER:
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fail("image_info misses an older loader's block")
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# loader_image must peel a padded image down to the slot content: a raw
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# .bin padded from address 0 (or a whole-flash read-back with the loader
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# resident at base) yields the same bytes as the bare slot image.
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import tempfile
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slot_image = bytes((0xAA,)) * 10 + tiny.raw + bytes((0xCC,)) * 40
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padded = bytes((0xFF,)) * tiny.base + slot_image
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with tempfile.NamedTemporaryFile(suffix=".bin", delete=False) as f:
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f.write(padded)
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padded_path = f.name
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try:
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if pb.loader_image(padded_path) != slot_image:
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fail("loader_image does not peel a padded image to the slot content")
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finally:
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os.unlink(padded_path)
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# Update preflight: the full fuse matrix, plus target mismatch.
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other = info_of(pb, 0x1E00, 32, True, 0x2000)
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expect_error("wrong-target image", lambda: pb.update_preflight(binary, other, None), "another target")
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expect_error("mega needs fuses", lambda: pb.update_preflight(bytes((0xAA,)) * 8 + mega.raw, mega, None),
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"--assume-fuses")
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mega_image = bytes((0xAA,)) * 8 + mega.raw
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def fuses(high):
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return bytes((0xFF, 0xFF, 0xFF, high))
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expect_error("BOOTSZ 512 B", lambda: pb.update_preflight(mega_image, mega, fuses(0xFE)),
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"cannot self-update", "BOOTSZ")
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notes = pb.update_preflight(mega_image, mega, fuses(0xFD)) # 1 KB, BOOTRST unprogrammed
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if not any("BOOTRST unprogrammed" in n for n in notes):
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fail(f"1K/unprogrammed notes: {notes}")
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notes = pb.update_preflight(mega_image, mega, fuses(0xFC)) # 1 KB, BOOTRST programmed
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if not any("staging slot" in n for n in notes):
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fail(f"1K/programmed notes: {notes}")
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notes = pb.update_preflight(mega_image, mega, fuses(0xFA)) # 2 KB, BOOTRST programmed
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if not any("application flash" in n for n in notes):
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fail(f"2K/programmed notes: {notes}")
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if pb.update_preflight(bytes((0xAA,)) * 8 + tiny.raw, tiny, None) != []:
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fail("tiny preflight should pass without fuses")
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# The 1284s' smallest boot section (512 words) is exactly the resident
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# slot plus its staging slot, so self-update is possible at the minimum
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# BOOTSZ — no fuse step up, the 644's geometry. That holds only while a
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# slot is 512 B: at 1 KiB the staging slot would fall outside the section
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# and the preflight would refuse.
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notes = pb.update_preflight(bytes((0xAA,)) * 8 + big.raw, big, fuses(0xFE))
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if not any("staging slot" in n for n in notes):
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fail(f"1284 minimum-BOOTSZ notes: {notes}")
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# The walk-region refusal: BOOTRST aimed below the loader plus app data
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# in the walk span errors without --force; erased spans and unprogrammed
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# BOOTRST pass.
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deep = {0x7800: bytes((1,)) * 128}
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expect_error("walk region", lambda: pb.check_walk_region(deep, mega, fuses(0xFA), False), "--force")
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pb.check_walk_region(deep, mega, fuses(0xFA), True)
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pb.check_walk_region(deep, mega, fuses(0xFB), False) # BOOTRST unprogrammed
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pb.check_walk_region({0x7800: bytes((0xFF,)) * 128}, mega, fuses(0xFA), False)
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pb.check_walk_region(deep, mega, None, False) # fuses unknown: no check
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# The repairing verify: a mismatched page is rewritten rather than raised,
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# bounded so a fault that is not self-clearing cannot spin.
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class FakeLoader:
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"""A device whose first `bad` writes of any page land wrong."""
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def __init__(self, info, bad):
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self.info = info
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self.bad = bad
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self.flash = {}
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self.writes = 0
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def write_page(self, address, data):
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self.writes += 1
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self.flash[address] = bytes(len(data)) if self.bad > 0 else bytes(data)
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self.bad -= 1
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def read_flash(self, address, count):
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return self.flash.get(address, bytes(count))
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want = {0: bytes((i * 5) & 0xFF for i in range(128))}
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# One bad write, then good: repaired in place, and the caller never sees
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# an error. The rewrite is counted, so a silent no-op cannot pass.
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device = FakeLoader(info_of(pb, 0x7E00, 128, False, 0x8000), bad=1)
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device.write_page(0, want[0])
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pb.verify_pages(device, want, repair=True)
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if device.writes != 2:
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fail(f"repairing verify made {device.writes} writes, expected 2")
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# Without repair the same state raises, so the repair is what fixed it.
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device = FakeLoader(info_of(pb, 0x7E00, 128, False, 0x8000), bad=1)
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device.write_page(0, want[0])
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expect_error("verify without repair", lambda: pb.verify_pages(device, want), "verify failed")
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# A page that never comes good stops after RETRIES rewrites, and says so.
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device = FakeLoader(info_of(pb, 0x7E00, 128, False, 0x8000), bad=99)
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device.write_page(0, want[0])
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expect_error(
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"unrepairable page",
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lambda: pb.verify_pages(device, want, repair=True),
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"verify failed",
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|
f"after {pb.RETRIES} retries",
|
|
)
|
|
if device.writes != pb.RETRIES + 1:
|
|
fail(f"unrepairable page took {device.writes} writes, expected {pb.RETRIES + 1}")
|
|
|
|
# The knock handshake against a device that is not listening yet — the
|
|
# state a port open leaves behind: it resets the chip into a fresh
|
|
# activation window while the previous session's prompt is still in
|
|
# flight, so the first knock is lost and a prompt arrives anyway.
|
|
class FakePort:
|
|
"""A loader in its activation window, plus `lost` leading writes the
|
|
reset swallows and one stale prompt still on the wire."""
|
|
|
|
def __init__(self, info_raw, lost=0, stale=b"", active=False):
|
|
self.info_raw = info_raw
|
|
self.lost = lost
|
|
self.inflight = bytearray(stale)
|
|
self.rx = bytearray()
|
|
self.active = active
|
|
self.last = None
|
|
|
|
def flush_input(self):
|
|
self.rx.clear()
|
|
|
|
def write(self, data):
|
|
if self.lost:
|
|
self.lost -= 1
|
|
return
|
|
for byte in bytes(data):
|
|
if not self.active:
|
|
self.active = self.last == ord("p") and byte == ord("b")
|
|
self.last = byte
|
|
if self.active:
|
|
self.rx += pb.PROMPT
|
|
elif byte == ord("b"):
|
|
self.rx += self.info_raw + pb.PROMPT
|
|
else:
|
|
self.rx += pb.PROMPT
|
|
|
|
def read_available(self, wait):
|
|
self.rx = self.inflight + self.rx # the stale prompt lands late
|
|
self.inflight.clear()
|
|
out, self.rx = bytes(self.rx), bytearray()
|
|
return out
|
|
|
|
def read_exact(self, count, timeout):
|
|
if len(self.rx) < count:
|
|
raise pb.Error(f"timeout: got {len(self.rx)} of {count} bytes")
|
|
out, self.rx = bytes(self.rx[:count]), self.rx[count:]
|
|
return out
|
|
|
|
raw = info_of(pb, 0x7E00, 128, False, 0x8000).raw
|
|
for what, port in (
|
|
("clean window", FakePort(raw)),
|
|
("stale prompt over a lost knock", FakePort(raw, lost=1, stale=pb.PROMPT)),
|
|
("live session", FakePort(raw, active=True)),
|
|
):
|
|
info = pb.Loader(port).connect(5)
|
|
if info.raw != raw:
|
|
fail(f"connect ({what}) returned {info.raw.hex()}")
|
|
|
|
# A device that never answers still says so, and a version the tool cannot
|
|
# speak is reported as such rather than retried into a timeout.
|
|
expect_error("dead device", lambda: pb.Loader(FakePort(raw, lost=99)).connect(0), "no answer")
|
|
old = bytes(raw[:2]) + bytes((pb.NEWEST_LOADER + 1,)) + bytes(raw[3:])
|
|
expect_error("unspeakable version", lambda: pb.Loader(FakePort(old)).connect(5), "needs a newer tool")
|
|
|
|
print("test_planner: all planner and policy checks pass")
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|