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attempt to address USB corruption by padding more

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This commit is contained in:
Brian S. Stephan 2023-07-11 23:28:34 -05:00
parent a7b8309b33
commit 6a147aa1d8
Signed by: bss
GPG Key ID: 3DE06D3180895FCB
4 changed files with 22 additions and 10 deletions
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7
gp2040ce_bintools/builder.py
View File

@ -152,11 +152,14 @@ def write_new_config_to_usb(config: Message, endpoint_out: object, endpoint_in:
# we don't write the whole area, just the minimum from the end of the storage section
# nevertheless, the USB device needs writes to start at 256 byte boundaries
logger.debug("serialized: %s", serialized)
padding = 256 - (len(serialized) % 256)
# not sure why this minimal padding isn't working but it leads to corruption
# maybe claims that erase need to be on 4096 byte sectors?
# padding = 256 - (len(serialized) % 256)
padding = 4096 - (len(serialized) % 4096)
logger.debug("length: %s with %s bytes of padding", len(serialized), padding)
binary = bytearray(b'\x00' * padding) + serialized
logger.debug("binary for writing: %s", binary)
write(endpoint_out, endpoint_in, STORAGE_MEMORY_ADDRESS + (STORAGE_SIZE - len(binary)), binary)
write(endpoint_out, endpoint_in, STORAGE_MEMORY_ADDRESS + (STORAGE_SIZE - len(binary)), bytes(binary))
############

9
gp2040ce_bintools/pico.py
View File

@ -198,8 +198,10 @@ def write(out_end: usb.core.Endpoint, in_end: usb.core.Endpoint, location: int,
location: memory address of where to start reading from
content: the data to write
"""
if (location % 256) != 0:
raise PicoAlignmentError("writes must start at 256 byte boundaries, please pad or align as appropriate!")
# not sure why 256 alignment isn't working but it leads to corruption
# maybe claims that erase need to be on 4096 byte sectors?
if (location % 4096) != 0:
raise PicoAlignmentError("writes must start at 4096 byte boundaries, please pad or align as appropriate!")
# set up the data
command_size = 8
@ -209,13 +211,14 @@ def write(out_end: usb.core.Endpoint, in_end: usb.core.Endpoint, location: int,
erase(out_end, in_end, location, len(content))
exit_xip(out_end, in_end)
pico_token = 1
logger.debug("writing %s bytes to %s", len(content), location)
logger.debug("writing %s bytes to %s", len(content), hex(location))
payload = struct.pack(PICOBOOT_CMD_STRUCT + PICOBOOT_CMD_READ_SUFFIX_STRUCT,
PICO_MAGIC, pico_token, PICO_COMMANDS['WRITE'], command_size, len(content),
location, len(content))
logger.debug("WRITE: %s", payload)
out_end.write(payload)
logger.debug("actually writing bytes now...")
logger.debug("payload: %s", content)
out_end.write(content)
res = in_end.read(256)
logger.debug("res: %s", res)

5
tests/test_builder.py
View File

@ -163,8 +163,9 @@ def test_write_new_config_to_usb(config_binary):
write_new_config_to_usb(config, end_out, end_in)
# check that it got padded
padded_serialized = bytearray(b'\x00' * 4) + serialized
assert mock_write.call_args.args[2] % 256 == 0
assert len(serialized) == 2044
padded_serialized = bytearray(b'\x00' * 2052) + serialized
assert mock_write.call_args.args[2] % 4096 == 0
assert mock_write.call_args.args[3] == padded_serialized

11
tests/test_pico.py
View File

@ -205,14 +205,19 @@ def test_misaligned_write():
with pytest.raises(pico.PicoAlignmentError):
_ = pico.write(end_out, end_in, 0x101FE0FF, b'\x00\x01\x02\x03')
_ = pico.write(end_out, end_in, 0x101FE100, b'\x00\x01\x02\x03')
# 256 byte alignment is what is desired, but see comments around there for
# why only 4096 seems to work right...
with pytest.raises(pico.PicoAlignmentError):
_ = pico.write(end_out, end_in, 0x101FE100, b'\x00\x01\x02\x03')
_ = pico.write(end_out, end_in, 0x101FF000, b'\x00\x01\x02\x03')
expected_writes = [
mock.call(struct.pack('<LLBBxxLL12x', 0x431fd10b, 1, 0x1, 1, 0, 1)),
mock.call(struct.pack('<LLBBxxL16x', 0x431fd10b, 1, 0x6, 0, 0)),
mock.call(struct.pack('<LLBBxxLLL8x', 0x431fd10b, 1, 0x3, 8, 0, 0x101FE100, 4)),
mock.call(struct.pack('<LLBBxxLLL8x', 0x431fd10b, 1, 0x3, 8, 0, 0x101FF000, 4)),
mock.call(struct.pack('<LLBBxxL16x', 0x431fd10b, 1, 0x6, 0, 0)),
mock.call(struct.pack('<LLBBxxLLL8x', 0x431fd10b, 1, 0x5, 8, 4, 0x101FE100, 4)),
mock.call(struct.pack('<LLBBxxLLL8x', 0x431fd10b, 1, 0x5, 8, 4, 0x101FF000, 4)),
mock.call(b'\x00\x01\x02\x03'),
mock.call(struct.pack('<LLBBxxLL12x', 0x431fd10b, 1, 0x1, 1, 0, 0)),
]