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a41ac2d21d
SPI: Various fixes (examples, mem leak, arg check) - Fix SPI master example to use DMA-capable memory for display initialization. Fixes https://github.com/espressif/esp-idf/issues/551 - SPI master: Do not leak DMA descriptor pointer array on free - SPI Master/Slave: Check if DMA'ed buffers actually live in DMA-capable memory See merge request !735