detect_rpi.py

#!/usr/bin/env python3

import sys

# TODO: Identify an RPI 5 and throw an error
VERSION_STRING_MAPPING = {
    # longest strings should go first!
    "Raspberry Pi Model A Plus": ("0x20000000", 400000000),
    "Raspberry Pi Zero 2":       ("0x3F000000", 400000000),
    "Raspberry Pi Zero":         ("0x20000000", 400000000),
    "Raspberry Pi 1":            ("0x20000000", 400000000),
    "Raspberry Pi 2":            ("0x3F000000", 250000000),
    "Raspberry Pi 3":            ("0x3F000000", 250000000),
    "Raspberry Pi 4":            ("0xFE000000", 250000000),
}

def detect_rpi_version(override):

    if not override:
        try:
            with open("/sys/firmware/devicetree/base/model", "r") as f:
                id_string = f.read()
        except FileNotFoundError:
            print("Not running on a Raspberry Pi, quitting")
            sys.exit(-1)
    else:
        id_string = override

    for version_string in VERSION_STRING_MAPPING:
        if id_string.startswith(version_string):
            sys.stderr.write("detected %s\n" % version_string)
            return VERSION_STRING_MAPPING[version_string]

    print("Could not determine rasperry pi version")
    sys.exit(-1)

if __name__ == "__main__":
    if len(sys.argv) > 1 and sys.argv[1] == "--test":
        override = "Raspberry Pi 3"
    else:
        override = ""
    addr, freq = detect_rpi_version(override)
    print("-DPHYS_REG_BASE=%s -DCLOCK_HZ=%d" % (addr, freq), end='')