🧪 [XIP] add experimental burst mode; fix endianness #361
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This PR adds an optional (experimental) burst mode for the XIP mode. The burst mode makes use of the flash's "incremental read" functionality to speed up sequential flash read accesses. XIP burst mode is enabled by setting bit 27 of the XIP's control register (calling new function
neorv32_xip_burst_mode_enable()).🐛 This PR also fixes the endiannes of the XIP mode. Now the XIP mode expects the data words to be stored in little-endian byte order to the flash. Thanks to @betocool-prog for finding this bug!