SPI clock frequency

[MikeSparkEvo]

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Hello, using Arduino Zero (SAMD21G18) and chip SST26VF064B the sketch flashdiagnostic does stuck at begin() call. After struggling a lot with electrical connection and making a good board layout to interface the chip with arduino, i found as solution to slow down the clock speed to 10MHz with setClock() macro.
This solved the problem, but my question is: why the library does keep the clock frequency too high for my mcu?

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[alessandrofrancesconi]

I had the same problem and I've solved by calling setClock(8 * 100000) before begin().
I believe SPIMemory devs should add a #if defined(ARDUINO_SAMD_ZERO) before begin, then set the clock accordingly.