tools/firmware_overview.py analyzes PM binaries and reports:
- Memory map (empty / DSP kernel / control flow / code+data)
- Entry point detection
- All DO UNTIL loops with MAC operation count
- All immediate constants with register names and addresses
- I/O operations with ADSP-2191 peripheral register names
- Optional DM cross-reference (I-reg targets)
- Summary statistics
Includes ADSP-2191 I/O register name table for SPORT, SPI,
UART, Timer, GPIO, DMA, System Controller, and Interrupts.
