Reads the SPI flash memory via SMN space

spi.py

#!/usr/bin/python3

import struct
import io
import sys
import os

IOHC_NB_SMN_INDEX_REG = 0xC4

config = os.open("/sys/devices/pci0000:00/0000:00:00.0/config", os.O_RDWR)
buffer = io.BytesIO()

for offset in range(0x44000000, 0x45FFFFFF, 4):
    os.lseek(config, IOHC_NB_SMN_INDEX_REG, os.SEEK_SET)
    os.write(config, struct.pack("I", offset))
    buffer.write(os.read(config, 4))

os.close(config)

sys.stdout.buffer.write(buffer.getbuffer())

sudo ./spi.py > spi.bin