Port Driver: Su2 Serial

– Some MIPS or ARM9 chips (e.g., Reneas SH-series) have an SU2-compatible peripheral. Kernel patches exist in vendor BSPs (Board Support Packages).

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// Inside su2_serial.c - The "Ghost Handshake" routine static void su2_echo_response(int gpio_tx, int gpio_rx) // Wait for the SU-2's query pulse while(!(read_gpio(rx) & PULSE_DETECT)); // Measured delay: 1.2ms (the vault's decay constant) udelay(1200); – Some MIPS or ARM9 chips (e