spi_nor_read_sfdp_dma_unsafe
err = spi_nor_read_sfdp_dma_unsafe(nor, 0, sizeof(signature),
err = spi_nor_read_sfdp_dma_unsafe(nor, 0, sizeof(header), &header);
err = spi_nor_read_sfdp_dma_unsafe(nor, addr, len, &bfpt);