Embedded Device Driver Development

Resolve a priority-inversion timeline using priority inheritance or priority ceiling and determine the resulting bound on blocking.

Determine whether a fixed-priority task set meets its deadlines using response-time analysis with execution time, higher-priority interference, and bounded blocking.

Design an ISR-to-thread deferred-processing path that bounds interrupt latency and transfers buffer or event ownership without races.

Trace Linux device binding from Device Tree compatible matching through probe, runtime operation, remove or unbind, and managed resource cleanup.

Determine which Linux locking, memory-allocation, and waiting operations are legal in process, hard-interrupt, softirq, threaded-interrupt, and workqueue contexts.

Complete a platform-driver probe skeleton that maps MMIO, registers an interrupt handler with managed APIs, and propagates ordinary and deferred-probe errors correctly.

Select an appropriate Linux diagnostic facility—kernel logs, dynamic debug, ftrace, lockdep, or a crash dump—for a given driver failure symptom.

Trace transmit and receive buffer ownership from a user socket through the network stack, driver queue or descriptor ring, MAC or MAC-PHY, and physical link, including interrupt- or poll-based completion.

Calculate effective network throughput from frame and protocol overhead, peripheral-bus transfer time, copy cost, and interrupt or polling rate, then identify the dominant bottleneck.

Localize an embedded connectivity failure by correlating Ethernet, ARP, DHCP, ICMP, and TCP traces with PHY link state, driver statistics, and kernel or RTOS logs.