20 lines
722 B
Markdown
20 lines
722 B
Markdown
## v2.0 - "kajetanless" white PCB
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### #1: Programming header J6 has non-standard layout
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Use a custom cable.
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### #2: R1 reset line resistor is pull-down
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R1 footprint *shall not be populated*, and an equivalent resistor should be put
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in a pull-up configuration between reset line and ground.
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Sensible place for that is between one C2 leg and reset line going next to it
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to J6 programming header.
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### #3: RS485 transceiver input/output enable is floating by default
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This breaks programming serial communication, unless input/output enable pins
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are properly set.
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This is fixed by applying optiboot patch - `0001-Disable-RS485-transceiver-when-running-the-bootloade.patch`
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## v2.1 - "pulled-up" green PCB
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Errata #2 fixed.
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