Merge pull request #10947 from mikeysklar/patch-1

docs(sdcardio): clarify SD-first init rule for boards with floating C…

Author: dhalbert

shared-bindings/sdcardio/SDCard.c

@@ -43,6 +43,13 @@
 //|            Failure to do so can prevent the SD card from being recognized until it is
 //|            powered off or re-inserted.
 //|
+//|            Exception: on boards where another SPI peripheral has a floating CS
+//|            pin with no hardware pull-up (such as the Feather RP2040 RFM), that
+//|            peripheral's CS must be driven HIGH before SD card initialization.
+//|            Failure to do so will corrupt the SPI bus during SD card init. In
+//|            these cases, initialize and drive the other peripheral's CS high
+//|            first, then initialize the SD card.
+//|
 //|         Example usage:
 //|
 //|         .. code-block:: python