I am trying to run the Python script on BARRIER BREAKER (14.07, r42625)/ar71xx :

#!/usr/bin/env python
# -*- encoding: UTF8 -*-
from smbus import SMBus
b = SMBus(0) # 0 indicates /dev/i2c-0
b.read_byte(0x20)
b.write_byte(0x20,0xF0)

I am getting the following message :

"Segmentation fault"

Could someone please give me some help ???

i have same problem with smbus

I got this SegFault too, on my new Domino OpenWRT.

The python script is :

import time
import smbus

MCP23017_DEVADDR = 0x20

bus = smbus.SMBus(0)

bus.write_byte_data(MCP23017_DEVADDR,0x00,0x00) # Set all of bank A to outputs
bus.write_byte_data(MCP23017_DEVADDR,0x01,0x00) # Set all of bank B to outputs

while 1:
    bus.write_byte_data(address,0x13,0x80)
    time.sleep(0.5)
    bus.write_byte_data(address,0x13,0x00)
    time.sleep(0.5)

It crash at the first write_byte_data ... :-(

The strace is showing :

open("/lib/libgcc_s.so.1", O_RDONLY)    = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=78632, ...}) = 0
close(4)                                = 0
open("/lib/libc.so.0", O_RDONLY)        = 4
fstat(4, {st_mode=S_IFREG|0755, st_size=359583, ...}) = 0
close(4)                                = 0
open("/lib/libc.so.0", O_RDONLY)        = 4
fstat(4, {st_mode=S_IFREG|0755, st_size=359583, ...}) = 0
close(4)                                = 0
open("/lib/ld-uClibc.so.0", O_RDONLY)   = 4
fstat(4, {st_mode=S_IFREG|0755, st_size=28968, ...}) = 0
close(4)                                = 0
close(3)                                = 0
open("/dev/i2c-0", O_RDWR|O_LARGEFILE)  = 3
ioctl(3, 0x703, 0x20)                   = 0
--- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0} ---
+++ killed by SIGSEGV +++
Segmentation fault

My version of OpenWRT is :

DISTRIB_ID="OpenWrt"
DISTRIB_RELEASE="Barrier Breaker"
DISTRIB_REVISION="r45620"
DISTRIB_CODENAME="barrier_breaker"
DISTRIB_TARGET="ar71xx/generic"
DISTRIB_DESCRIPTION="OpenWrt Barrier Breaker 14.07"
DISTRIB_TAINTS="busybox"