diff options
Diffstat (limited to 'util')
| -rw-r--r-- | util/apcb/README | 3 | ||||
| -rwxr-xr-x | util/apcb/apcb_edit.py | 185 |
2 files changed, 188 insertions, 0 deletions
diff --git a/util/apcb/README b/util/apcb/README new file mode 100644 index 0000000000..a765f4d9bd --- /dev/null +++ b/util/apcb/README @@ -0,0 +1,3 @@ +The necessary tools for building APCBs are not available for use by coreboot. +This tool allows patching an existing APCB binary with specific SPDs +and GPIO selection pins. diff --git a/util/apcb/apcb_edit.py b/util/apcb/apcb_edit.py new file mode 100755 index 0000000000..4a7e683ebe --- /dev/null +++ b/util/apcb/apcb_edit.py @@ -0,0 +1,185 @@ +#! /usr/bin/env python + +# 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( + '--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\n" % (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\n' % 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\n' % 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\n" % (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) + + print("Enabling channel %d, dimm %d and injecting SPD\n" % + (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\n" % + (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\n" % (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() |