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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 [candlelight](https://github.com/candle-usb/candleLight_fw), such as a
[Canable](https://canable.io/). Alternatively, a device that supports [Canable](https://canable.io/). Alternatively, a device that supports
Klipper's USB-CAN bridge mode works well. Klipper's USB-CAN bridge mode works well.
- The BTT U2C v2.1 CAN peripheral does not work with CanBoot. The device fails - The BTT U2C v2.1 CAN device does not consistently work with CanBoot. On
when large data transfers are requested. Note that this problem may also some systems (anecodotally the Raspberry Pi 4) the device fails when
lead to Klipper to shutdowns. Avoid this device until BTT has resolved the large data transfers are requested. Note that this problem may also
problem. lead to Klipper to shutdowns. This device *may* work depending on your
- If using a MCP2515 CAN Device (ie: Waveshare RS485 CAN HAT) it is possible 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 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 the verification process. That said, I have successfully tested the 12 MHz
Crystal variant with the Crystal variant with the