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Software at the hardware boundary
Firmware interviews at silicon companies sit at the boundary between software behavior and hardware contracts. Candidates may need to reason about MMIO ordering, interrupt latency, DMA ownership, bounded memory, peripheral protocols, crash evidence, and startup flow in the same discussion.
Use this collection to practice both embedded algorithms and hardware-software integration. Trace data from a register or interrupt source through the driver, buffer, and consumer; define who owns each descriptor or byte at every step; and describe how failures are observed.
Topic breakdown
Reason about MMIO, interrupts, DMA descriptors, peripheral timing, and explicit ownership across concurrency boundaries.
Write safe parsers, buffers, and algorithms with fixed memory, checked arithmetic, and atomic failure behavior.
Follow execution from image loading to peripherals and use trace, crash, and register evidence to isolate silicon-only failures.
Curated practice links
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Explain the key Parser and Bounds decisions, assumptions, and checks.
Firmware Algorithms · MediumExplain the key MMIO and Strings decisions, assumptions, and checks.
Hardware-Software Integration · MediumExplain the key Binary search and Lower bound decisions, assumptions, and checks.
Firmware Algorithms · EasyExplain the key Buffer and Backward scan decisions, assumptions, and checks.
Firmware Algorithms · EasyExplain the key DMA and Arrays decisions, assumptions, and checks.
Hardware-Software Integration · EasyExplain the key Trees and Fixed memory decisions, assumptions, and checks.
Firmware Algorithms · EasyExplain the key MMIO and Stack decisions, assumptions, and checks.
Hardware-Software Integration · MediumExplain the key Arrays and Multiset decisions, assumptions, and checks.
Firmware Algorithms · EasyExplain the key DMA and Flood fill decisions, assumptions, and checks.
Hardware-Software Integration · HardExplain the key Linked lists and Fixed memory decisions, assumptions, and checks.
Firmware Algorithms · MediumExplain the key MMIO and FIFO decisions, assumptions, and checks.
Hardware-Software Integration · MediumExplain the key Backtracking and Fixed memory decisions, assumptions, and checks.
Firmware Algorithms · MediumExplain the key Firmware and Anagrams decisions, assumptions, and checks.
Strings · MediumExplain the key Firmware and Min-heap decisions, assumptions, and checks.
Data Structures · HardExplain the key Firmware and Monotonic queue decisions, assumptions, and checks.
Data Structures · HardExplain the key DMA and Ring buffer decisions, assumptions, and checks.
Reference Models · HardExplain the key Interrupts and Priority decisions, assumptions, and checks.
Reference Models · HardExplain the key Interrupts and ISR decisions, assumptions, and checks.
Hardware-Software Integration · EasyExplain the key Alignment and Overflow decisions, assumptions, and checks.
Firmware Algorithms · EasyExplain the key SPI and DMA decisions, assumptions, and checks.
Hardware-Software Integration · MediumExplain the key Post-silicon and Crash dump decisions, assumptions, and checks.
Hardware-Software Integration · MediumExplain the key Randomization and Rejection sampling decisions, assumptions, and checks.
Firmware Algorithms · MediumExplain the design choices, edge cases, and validation approach.
Firmware · EasyExplain the design choices, edge cases, and validation approach.
Firmware · EasyExplain the design choices, edge cases, and validation approach.
Firmware · EasyExplain the key FPGA decisions, assumptions, and checks.
Firmware · EasyExplain the key Cache decisions, assumptions, and checks.
Firmware · MediumExplain the key JTAG and ELF decisions, assumptions, and checks.
Firmware · MediumExplain the key Virtual memory and Page fault decisions, assumptions, and checks.
Firmware · MediumExplain the key Registers and Firmware decisions, assumptions, and checks.
Design Verification · Medium