Problem with spi.read()

[peterhinch]

Using hard SPI, reading a single byte works, but reading multiple bytes returns a bytes instance containing N zeros.

I am using SPI(2) on a Pyboard D SF6. The problem disappears with an old version of firmware. I've checked the signals with a LA and everything looks fine whether reading a single byte or multiple. Baudrate is 5MHz, other args are default. readinto and write_readinto are also affected, but read() is the simplest case.

Any chance of someone seeing if they can replicate this?

[peterhinch]

I have raised #13471.