98 lines
2.2 KiB
Python
98 lines
2.2 KiB
Python
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#!/usr/bin/python
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#Script to read/write the nvram
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import sys
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import os
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import getopt
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import struct
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nvram_resource='/dev/nvram'
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def usage():
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''' This is the Usage Method '''
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print 'Utility for NVRAM read/write'
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print '\t\t nvram_rd_wr.py --get --offset <offset>'
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print '\t\t nvram_rd_wr.py --set --val <val> --offset <offset>'
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sys.exit(1)
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def nvram_reg_read(nvram_resource,offset):
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fd=os.open(nvram_resource, os.O_RDONLY)
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if(fd<0):
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print 'file open failed %s"%nvram_resource'
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return
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if(os.lseek(fd, offset, os.SEEK_SET) != offset):
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print 'lseek failed on %s'%nvram_resource
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return
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buf=os.read(fd,1)
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reg_val1=ord(buf)
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print 'value %x'%reg_val1
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os.close(fd)
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def nvram_reg_write(nvram_resource,offset,val):
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fd=os.open(nvram_resource,os.O_RDWR)
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if(fd<0):
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print 'file open failed %s"%nvram_resource'
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return
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if(os.lseek(fd, offset, os.SEEK_SET) != offset):
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print 'lseek failed on %s'%nvram_resource
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return
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ret=os.write(fd,struct.pack('B',val))
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if(ret != 1):
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print 'write failed %d'%ret
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return
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os.close(fd)
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def main(argv):
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''' The main function will read the user input from the
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command line argument and process the request '''
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opts = ''
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val = ''
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choice = ''
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resouce = ''
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offset = ''
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try:
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opts, args = getopt.getopt(argv, "hgs:" , \
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["val=","offset=","help", "get", "set"])
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except getopt.GetoptError:
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usage()
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if not os.path.exists(nvram_resource):
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print 'NVRAM is not initialized'
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sys.exit(1)
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for opt,arg in opts:
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if opt in ('-h','--help'):
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choice = 'help'
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elif opt in ('-g', '--get'):
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choice = 'get'
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elif opt in ('-s', '--set'):
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choice = 'set'
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elif opt == '--offset':
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offset = int(arg,16) - 0xE
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elif opt == '--val':
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val = int(arg,16)
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if choice == 'get' and offset != '':
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nvram_reg_read(nvram_resource,offset)
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elif choice == 'set' and offset != '' and val != '':
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nvram_reg_write(nvram_resource,offset,val)
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else:
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usage()
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#Calling the main method
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if __name__ == "__main__":
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main(sys.argv[1:])
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