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#!/usr/bin/env python3
# Script for editing APCB binaries, such as injecting SPDs and GPIO
# configurations.
import sys
import re
import argparse
from collections import namedtuple
from struct import *
GPIO_MAGIC = bytes.fromhex('fadeddad' * 3)
SPD_MAGIC = bytes.fromhex('f005ba110000')
EMPTY_SPD = b'\x00' * 512
spd_ssp_struct_fmt = '??B?IIBBBxIIBBBx'
spd_ssp_struct = namedtuple(
'spd_ssp_struct', 'SpdValid, DimmPresent, \
PageAddress, NvDimmPresent, \
DramManufacturersIDCode, Address, \
SpdMuxPresent, MuxI2CAddress, MuxChannel, \
Technology, Package, SocketNumber, \
ChannelNumber, DimmNumber')
def parseargs():
parser = argparse.ArgumentParser(description='Inject SPDs and SPD GPIO \
selection pins into APCB binaries')
parser.add_argument(
'apcb_in',
nargs='?',
type=argparse.FileType('rb'),
default=sys.stdin,
help='APCB input file')
parser.add_argument(
'apcb_out',
nargs='?',
type=argparse.FileType('wb'),
default=sys.stdout,
help='APCB output file')
parser.add_argument(
'--spd_0_0',
type=argparse.FileType('r'),
help='SPD input file for channel 0, dimm 0')
parser.add_argument(
'--spd_0_1',
type=argparse.FileType('r'),
help='SPD input file for channel 0, dimm 1')
parser.add_argument(
'--spd_1_0',
type=argparse.FileType('r'),
help='SPD input file for channel 1, dimm 0')
parser.add_argument(
'--spd_1_1',
type=argparse.FileType('r'),
help='SPD input file for channel 1, dimm 1')
parser.add_argument(
'--hex',
action='store_true',
help='SPD input file is hex encoded, binary otherwise')
parser.add_argument(
'--strip_manufacturer_information',
action='store_true',
help='Strip all manufacturer information from SPD')
parser.add_argument(
'--board_id_gpio0',
type=int,
required=True,
nargs=3,
help='Board ID GPIO 0: NUMBER IO_MUX BANK_CTRL')
parser.add_argument(
'--board_id_gpio1',
type=int,
required=True,
nargs=3,
help='Board ID GPIO 1: NUMBER IO_MUX BANK_CTRL')
parser.add_argument(
'--board_id_gpio2',
type=int,
required=True,
nargs=3,
help='Board ID GPIO 2: NUMBER IO_MUX BANK_CTRL')
parser.add_argument(
'--board_id_gpio3',
type=int,
required=True,
nargs=3,
help='Board ID GPIO 3: NUMBER IO_MUX BANK_CTRL')
return parser.parse_args()
def chksum(data):
sum = 0
for b in data[:16] + data[17:]:
sum = (sum + b) & 0xff
return (0x100 - sum) & 0xff
def inject(orig, insert, offset):
return b''.join([orig[:offset], insert, orig[offset + len(insert):]])
def main():
args = parseargs()
print("Reading input APCB from %s" % (args.apcb_in.name))
apcb = args.apcb_in.read()
orig_apcb_len = len(apcb)
gpio_offset = apcb.find(GPIO_MAGIC)
assert gpio_offset > 0, "GPIO magic number not found"
print('GPIO magic number found at offset 0x%x' % gpio_offset)
gpio_array = (args.board_id_gpio0 + args.board_id_gpio1 +
args.board_id_gpio2 + args.board_id_gpio3)
print('Writing SPD GPIO array %s' % gpio_array)
apcb = inject(apcb, pack('BBBBBBBBBBBB', *gpio_array), gpio_offset)
spd_offset = 0
while True:
spd_offset = apcb.find(SPD_MAGIC, spd_offset)
if spd_offset < 0:
break
spd_ssp_offset = spd_offset - calcsize(spd_ssp_struct_fmt)
spd_ssp_bytes = apcb[spd_ssp_offset:spd_offset]
spd_ssp = spd_ssp_struct._make(
unpack(spd_ssp_struct_fmt, spd_ssp_bytes))
assert spd_ssp.DimmNumber >= 0 and spd_ssp.DimmNumber <= 1, \
"Unexpected dimm number found in APCB"
assert spd_ssp.ChannelNumber >= 0 and spd_ssp.ChannelNumber <= 1, \
"Unexpected channel number found in APCB"
print("Found SPD magic number with channel %d and dimm %d "
"at offset 0x%x" % (spd_ssp.ChannelNumber, spd_ssp.DimmNumber,
spd_offset))
dimm_channel = (spd_ssp.ChannelNumber, spd_ssp.DimmNumber)
spd = None
if dimm_channel == (0, 0) and args.spd_0_0:
spd = args.spd_0_0.read()
elif dimm_channel == (0, 1) and args.spd_0_1:
spd = args.spd_0_1.read()
elif dimm_channel == (1, 0) and args.spd_1_0:
spd = args.spd_1_0.read()
elif dimm_channel == (1, 1) and args.spd_1_1:
spd = args.spd_1_0.read()
if spd:
if args.hex:
spd = re.sub(r'#.*', '', spd)
spd = re.sub(r'\s+', '', spd)
spd = bytes.fromhex(spd)
else:
spd = spd.encode()
assert len(spd) == 512, \
"Expected SPD to be 512 bytes, got %d" % len(spd)
if args.strip_manufacturer_information:
print("Stripping manufacturer information from SPD")
spd = spd[0:320] + b'\x00'*64 + spd[320+64:]
assert len(spd) == 512, \
"Error while stripping SPD manufacurer information"
print("Enabling channel %d, dimm %d and injecting SPD" %
(spd_ssp.ChannelNumber, spd_ssp.DimmNumber))
spd_ssp = spd_ssp._replace(SpdValid=True, DimmPresent=True)
else:
print("Disabling channel %d, dimm %d and clearing SPD" %
(spd_ssp.ChannelNumber, spd_ssp.DimmNumber))
spd_ssp = spd_ssp._replace(SpdValid=False, DimmPresent=False)
spd = EMPTY_SPD
apcb = inject(apcb, pack(spd_ssp_struct_fmt, *spd_ssp), spd_ssp_offset)
apcb = inject(apcb, spd, spd_offset)
spd_offset += 512
print("Fixing checksum and writing to %s" % (args.apcb_out.name))
apcb = inject(apcb, bytes([chksum(apcb)]), 16)
assert chksum(apcb) == apcb[16], "Checksum is invalid"
assert orig_apcb_len == len(apcb), \
"The size of the APCB binary changed, this should not happen."
args.apcb_out.write(apcb)
if __name__ == "__main__":
main()
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