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readme: add U2C v2.1 note

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This device is bugged and does not work with CanBoot.  This
issue is referenced in #44.

Signed-off-by:  Eric Callahan <arksine.code@gmail.com>
This commit is contained in:
Eric Callahan 2023-01-05 07:50:08 -05:00
parent 88e208a083
commit ec96191e4b
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README.md
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@ -179,7 +179,12 @@ acceptance of the
## Notes
- It is recommended to USB CAN device flashed with
[candlelight](https://github.com/candle-usb/candleLight_fw), such as a
[Canable](https://canable.io/).
[Canable](https://canable.io/). Alternatively, a device that supports
Klipper's USB-CAN bridge mode works well.
- The BTT U2C v2.1 CAN peripheral does not work with CanBoot. The device fails
when large data transfers are requested. Note that this problem may also
lead to Klipper to shutdowns. Avoid this device until BTT has resolved the
problem.
- If using a MCP2515 CAN Device (ie: Waveshare RS485 CAN HAT) it is possible
that packets will be dropped when reading flash back from the node during
the verification process. That said, I have successfully tested the 12 MHz