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1. All the documentation is available on the web page you mentioned.
2. Please see the description fields of the pins on page 9-10 of the datasheet. The corresponding BCM4390 pin is listed in the description. For example, module pin 23 is GPIO A0 on the BCM4390. Looking at the 4390 datasheet (page 15), GPIO A0 can be programmed to be SPI chip select.
I purchase a Develop Board TiWi-C-W and don't get to write internal flash.
How work the pin FLASH_OVERIDE? I'm try write with Olimex Usb Tiny, but it don't work for me.