Driver parameters: - firmware_command_timeout, int: a number of seconds that the host waits for the DSP to respond to a synchronization request or a command. Can be changed at runtime through the following sysfs entry: /sys/module/xrp/parameters/firmware_command_timeout - firmware_reboot, 0/1: controls whether the driver reboots firmware on command timeout. Enabled by default and can be changed at runtime through the following sysfs entry: /sys/module/xrp/parameters/firmware_reboot - loopback, 0/1/2/3: controls level of interaction between the driver and the firmware. 0: normal operation. The driver loads firmware, controls DSP and interacts with the firmware through shared memory; 1: no-communication loopback. The driver loads the firmware and controls DSP, but does not communicate with firmware. Initial synchronization is not performed and command submission is completed immediately after all normal preparation steps related to buffer mapping. Communication area is not touched by the driver. 2: no-control loopback. The driver loads the firmware, but does not control DSP nor does it communicate with the firmware. Neither communication area nor DSP MMIO area are touched by the driver. 3: no-firmware loopback. The driver doesn't load firmware, doesn't control DSP and doesn't communicate with DSP.