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@Gordon
No, it's fine - you just have to choose pins that are actually on a proper SPI peripheral. Software SPI won't work with CC3000/WIZnet (at the moment).
Have you seen http://www.espruino.com/ReferenceHYSTM32_32 ? There's a list of them at the top of http://www.espruino.com/Reference - that's basically the main list of available pins and what they can be used for. On the STM32F1 boards you can only use 'groups' of SPI pins together though - for instance B3,B4,B5 - but not B3,B4,A7.