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readme: clarify U2C note

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Signed-off-by:  Eric Callahan <arksine.code@gmail.com>
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Eric Callahan 2023-01-05 12:39:18 -05:00
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@ -181,11 +181,12 @@ acceptance of the
[candlelight](https://github.com/candle-usb/candleLight_fw), such as a
[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
- The BTT U2C v2.1 CAN device does not consistently work with CanBoot. On
some systems (anecodotally the Raspberry Pi 4) the device fails when
large data transfers are requested. Note that this problem may also
lead to Klipper to shutdowns. This device *may* work depending on your
hardware setup, however tread carefully.
- 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
Crystal variant with the