first impressions of the Lego smart brick, before I do any actual tearing down: wow, I forgot how good they are at working with plastic.
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here's how the flash was mounted in its natural environment, in absence of feline predators
the SPI bus seems to be shared with something else & they're definitely using ViP
alright let's dump the ARC chip now
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@whitequark very important pad
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complete success
@whitequark What are you using to dump the chips?
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@whitequark @gsuberland @ldcd @ftg huh I thought microchip ECs were mostly arm based
@azonenberg @whitequark @gsuberland @ldcd @ftg
When Microchip first produced a PIC32 it was built around MIPS (I was at HI-TECH Software at the time - we had a compiler targeting it). Later they acquired Atmel and renamed the (ARM-based) SAM series "PIC32..." -
@azonenberg @whitequark @gsuberland @ldcd @ftg
When Microchip first produced a PIC32 it was built around MIPS (I was at HI-TECH Software at the time - we had a compiler targeting it). Later they acquired Atmel and renamed the (ARM-based) SAM series "PIC32..."@mlp @whitequark @gsuberland @ldcd @ftg yes I'm talking about their embedded controllers for laptops etc not general purposes MCUs.
Real PIC32 is mips, not the rebranded SAMs sold under the pic32 brand
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@whitequark What are you using to dump the chips?
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@whitequark Cool! Thank you.
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alright let's dump the ARC chip now
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first impressions of the Lego smart brick, before I do any actual tearing down: wow, I forgot how good they are at working with plastic. the injecton molding remains impeccable, at least for this specific piece (I know about their recent QC issues elsewhere)
it's hard for me to look at the positively microscopic (I am literally using a microscope to look at it) "Li-Ion" lettering and think of anything but "showing off!"
(treehouse doesn't let me attach the full size images, you can grab them here: front, side)
@whitequark but the most important question remains unanswered: Can you make it play actual star wars sounds instead of the unintelligible gibberish now?
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alright let's dump the ARC chip now
not my best work but it should do the trick
feat. comically big q-tip
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not my best work but it should do the trick
feat. comically big q-tip
@whitequark oh lol I thought it was a cat’s paw
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@whitequark oh lol I thought it was a cat’s paw
@dev that would be a really small cat
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not my best work but it should do the trick
feat. comically big q-tip
unfortunately, i could not access JTAG. i think i ran out of time i have for playing with this board, good luck @ everyone else
shout out to:
https://github.com/nanash1/smart_brick
https://codeberg.org/shelfofsheelfs/SMART-Brick
for doing good work! -
unfortunately, i could not access JTAG. i think i ran out of time i have for playing with this board, good luck @ everyone else
shout out to:
https://github.com/nanash1/smart_brick
https://codeberg.org/shelfofsheelfs/SMART-Brick
for doing good work!after reading the datasheet a bit more carefully, i know why i couldn't: the JTAG port is simply not exposed unless the firmware configures the pin mux that way. i'd have to dump the firmware in some other way
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after reading the datasheet a bit more carefully, i know why i couldn't: the JTAG port is simply not exposed unless the firmware configures the pin mux that way. i'd have to dump the firmware in some other way
@whitequark oh how fun, but makes sense for such a pin-constrained device. Is there any other way to access it or is the chip just impossible to reprogram it if it doesnt expose JTAG?
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@whitequark oh how fun, but makes sense for such a pin-constrained device. Is there any other way to access it or is the chip just impossible to reprogram it if it doesnt expose JTAG?
@cinebox it has a bootloader which I assume is how it's programmed by LEGO; I think I know how to trigger that but I just wanted to connect JTAG because it was more challenging to solder these tiny wires and I'm bad at doing it
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after reading the datasheet a bit more carefully, i know why i couldn't: the JTAG port is simply not exposed unless the firmware configures the pin mux that way. i'd have to dump the firmware in some other way
@whitequark could it have booted in cJTAG mode?
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@whitequark could it have booted in cJTAG mode?
@ldcd the datasheet explicitly says the JTAG pins are GPIO'd
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here's a video that shows in more detail the moldwork in the transparent plastic part
@whitequark are the pips on top buttons too?
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