DDR fatal error on boot due to SPD flash corruption

#!/usr/bin/python

import subprocess, re

correct_dump = '''
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: 92 13 0b 03 04 21 02 01 03 11 01 08 0a 00 fe 00    ?????!???????.?.
10: 69 78 69 30 69 11 18 81 20 08 3c 3c 00 f0 83 01    ixi0i??? ?<<.???
20: 00 00 00 00 00 00 00 00 00 86 00 00 00 00 00 00    .........?......
30: 00 00 00 00 00 00 00 00 00 00 00 00 2f 11 01 00    ............/??.
40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
70: 00 00 00 00 00 01 98 01 14 41 c0 0e 31 8b 7d 53    .....????A??1?}S
80: 39 39 30 35 34 36 39 2d 31 34 35 2e 41 30 30 4c    9905469-145.A00L
90: 46 20 00 00 80 2c 00 00 00 00 00 00 00 00 00 00    F ..?,..........
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 5a    ...............Z
'''

offset_re = re.compile('^[0-9a-f][0-9a-f]: .*')
hex_re = re.compile('^[0-9a-f][0-9a-f]$')

sdp_bus = '0'
sdp_addr = '0x50'

def dump_to_bytelist(s) :
    last_offset = None
    byte_list = []
    for l in s.split('\n') :
        m = offset_re.match(l)
        if m is not None :
            this_offset = int(l[0:2], 16)
            assert(last_offset is None or this_offset == last_offset + 16)
            arr = l.split()
            assert(len(arr) > 17)
            for i in arr[1:17] :
                assert(hex_re.match(i))
                byte_list.append(int(i, 16))
            last_offset = this_offset
    assert(len(byte_list) == 256)
    return byte_list

def dump_sdp() :
    p = subprocess.Popen(['/usr/sbin/i2cdump', '-y', sdp_bus, sdp_addr], stdout=subprocess.PIPE)
    dump_text = p.stdout.read()
    ret_code = p.wait()
    if ret_code != 0 :
        print 'i2cdump failed'
        sys.exit(1)
    return dump_to_bytelist(dump_text)

def set_sdp_bytes(byte_list) :
    for idx, byte_val in byte_list :
        cmd = ['/usr/sbin/i2cset', '-y', sdp_bus, sdp_addr, str(idx), str(byte_val)]
        #print cmd
        #ret_code = 0
        ret_code = subprocess.call(cmd)
        if ret_code != 0 :
            print 'i2cset failed'
            sys.exit(1)

def compare(correct_bytes, current_bytes) :
    diff_list = []
    for idx in range(0, len(correct_bytes)) :
        if current_bytes[idx] != correct_bytes[idx] :
            diff_list.append( (idx, current_bytes[idx], correct_bytes[idx]) )
    return diff_list

def show_bytes(byte_list) :
    line_offset = 0
    byte_dict = dict(byte_list)
    while line_offset < 256 :
        line = ('%02x: '%line_offset) + ' '.join('%02x'%byte_dict[v] if v in byte_dict else '__' for v in range(line_offset, line_offset+16))
        print line
        line_offset += 16

correct_bytes = dump_to_bytelist(correct_dump)
current_bytes = dump_sdp()

diff_list = compare(correct_bytes, current_bytes)

if len(diff_list) == 0 :
    print 'SDP is correct'
else :
    print 'SDP differs, current bytes incorrect'
    show_bytes([(a[0], a[1]) for a in diff_list])
    print 'correct bytes'
    show_bytes([(a[0], a[2]) for a in diff_list])
    y_n = raw_input('Fix? ')
    print y_n
    if y_n.lower() == 'y' :
        set_sdp_bytes([(a[0], a[2]) for a in diff_list])