# vim: tabstop=4 shiftwidth=4 softtabstop=4 # coding=utf8 # Copyright 2015 Lenovo # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # This implements parsing of DDR SPD data. This is offered up in a pass # through fashion by some service processors. # For now, just doing DDR3 and DDR4 # In many cases, astute readers will note that some of the lookup tables # should be a matter of math rather than lookup. However the SPD # specification explicitly reserves values not in the lookup tables for # future use. It has happened, for example, that a spec was amended # with discontinuous values for a field that was until that point # possible to derive in a formulaic way import struct jedec_ids = [ { 0x01: "AMD", 0x02: "AMI", 0x83: "Fairchild", 0x04: "Fujitsu", 0x85: "GTE", 0x86: "Harris", 0x07: "Hitachi", 0x08: "Inmos", 0x89: "Intel", 0x8a: "I.T.T.", 0x0b: "Intersil", 0x8c: "Monolithic Memories", 0x0d: "Mostek", 0x0e: "Motorola", 0x8f: "National", 0x10: "NEC", 0x91: "RCA", 0x92: "Raytheon", 0x13: "Conexant (Rockwell)", 0x94: "Seeq", 0x15: "Philips Semi. (Signetics)", 0x16: "Synertek", 0x97: "Texas Instruments", 0x98: "Toshiba", 0x19: "Xicor", 0x1a: "Zilog", 0x9b: "Eurotechnique", 0x1c: "Mitsubishi", 0x9d: "Lucent (AT&T)", 0x9e: "Exel", 0x1f: "Atmel", 0x20: "SGS/Thomson", 0xa1: "Lattice Semi.", 0xa2: "NCR", 0x23: "Wafer Scale Integration", 0xa4: "IBM", 0x25: "Tristar", 0x26: "Visic", 0xa7: "Intl. CMOS Technology", 0xa8: "SSSI", 0x29: "Microchip Technology", 0x2a: "Ricoh Ltd.", 0xab: "VLSI", 0x2c: "Micron Technology", 0xad: "Hyundai Electronics", 0xae: "OKI Semiconductor", 0x2f: "ACTEL", 0xb0: "Sharp", 0x31: "Catalyst", 0x32: "Panasonic", 0xb3: "IDT", 0x34: "Cypress", 0xb5: "DEC", 0xb6: "LSI Logic", 0x37: "Zarlink", 0x38: "UTMC", 0xb9: "Thinking Machine", 0xba: "Thomson CSF", 0x3b: "Integrated CMOS(Vertex)", 0xbc: "Honeywell", 0x3d: "Tektronix", 0x3e: "Sun Microsystems", 0xbf: "SST", 0x40: "MOSEL", 0xc1: "Infineon", 0xc2: "Macronix", 0x43: "Xerox", 0xc4: "Plus Logic", 0x45: "SunDisk", 0x46: "Elan Circuit Tech.", 0xc7: "European Silicon Str.", 0xc8: "Apple Computer", 0xc9: "Xilinx", 0x4a: "Compaq", 0xcb: "Protocol Engines", 0x4c: "SCI", 0xcd: "Seiko Instruments", 0xce: "Samsung", 0x4f: "I3 Design System", 0xd0: "Klic", 0x51: "Crosspoint Solutions", 0x52: "Alliance Semiconductor", 0xd3: "Tandem", 0x54: "Hewlett-Packard", 0xd5: "Intg. Silicon Solutions", 0xd6: "Brooktree", 0x57: "New Media", 0x58: "MHS Electronic", 0xd9: "Performance Semi.", 0xda: "Winbond Electronic", 0x5b: "Kawasaki Steel", 0xdc: "Bright Micro", 0x5d: "TECMAR", 0x5e: "Exar", 0xdf: "PCMCIA", 0xe0: "LG Semiconductor", 0x61: "Northern Telecom", 0x62: "Sanyo", 0xe3: "Array Microsystems", 0x64: "Crystal Semiconductor", 0xe5: "Analog Devices", 0xe6: "PMC-Sierra", 0x67: "Asparix", 0x68: "Convex Computer", 0xe9: "Quality Semiconductor", 0xea: "Nimbus Technology", 0x6b: "Transwitch", 0xec: "Micronas (ITT Intermetall)", 0x6d: "Cannon", 0x6e: "Altera", 0xef: "NEXCOM", 0x70: "QUALCOMM", 0xf1: "Sony", 0xf2: "Cray Research", 0x73: "AMS (Austria Micro)", 0xf4: "Vitesse", 0x75: "Aster Electronics", 0x76: "Bay Networks (Synoptic)", 0xf7: "Zentrum", 0xf8: "TRW", 0x79: "Thesys", 0x7a: "Solbourne Computer", 0xfb: "Allied-Signal", 0x7c: "Dialog", 0xfd: "Media Vision", 0xfe: "Level One Communication", }, { 0x01: "Cirrus Logic", 0x02: "National Instruments", 0x83: "ILC Data Device", 0x04: "Alcatel Mietec", 0x85: "Micro Linear", 0x86: "Univ. of NC", 0x07: "JTAG Technologies", 0x08: "Loral", 0x89: "Nchip", 0x8A: "Galileo Tech", 0x0B: "Bestlink Systems", 0x8C: "Graychip", 0x0D: "GENNUM", 0x0E: "VideoLogic", 0x8F: "Robert Bosch", 0x10: "Chip Express", 0x91: "DATARAM", 0x92: "United Microelec Corp.", 0x13: "TCSI", 0x94: "Smart Modular", 0x15: "Hughes Aircraft", 0x16: "Lanstar Semiconductor", 0x97: "Qlogic", 0x98: "Kingston", 0x19: "Music Semi", 0x1A: "Ericsson Components", 0x9B: "SpaSE", 0x1C: "Eon Silicon Devices", 0x9D: "Programmable Micro Corp", 0x9E: "DoD", 0x1F: "Integ. Memories Tech.", 0x20: "Corollary Inc.", 0xA1: "Dallas Semiconductor", 0xA2: "Omnivision", 0x23: "EIV(Switzerland)", 0xA4: "Novatel Wireless", 0x25: "Zarlink (formerly Mitel)", 0x26: "Clearpoint", 0xA7: "Cabletron", 0xA8: "Silicon Technology", 0x29: "Vanguard", 0x2A: "Hagiwara Sys-Com", 0xAB: "Vantis", 0x2C: "Celestica", 0xAD: "Century", 0xAE: "Hal Computers", 0x2F: "Rohm Company Ltd.", 0xB0: "Juniper Networks", 0x31: "Libit Signal Processing", 0x32: "Enhanced Memories Inc.", 0xB3: "Tundra Semiconductor", 0x34: "Adaptec Inc.", 0xB5: "LightSpeed Semi.", 0xB6: "ZSP Corp.", 0x37: "AMIC Technology", 0x38: "Adobe Systems", 0xB9: "Dynachip", 0xBA: "PNY Electronics", 0x3B: "Newport Digital", 0xBC: "MMC Networks", 0x3D: "T Square", 0x3E: "Seiko Epson", 0xBF: "Broadcom", 0x40: "Viking Components", 0xC1: "V3 Semiconductor", 0xC2: "Flextronics (formerly Orbit)", 0x43: "Suwa Electronics", 0xC4: "Transmeta", 0x45: "Micron CMS", 0x46: "American Computer & Digital Components Inc", 0xC7: "Enhance 3000 Inc", 0xC8: "Tower Semiconductor", 0x49: "CPU Design", 0x4A: "Price Point", 0xCB: "Maxim Integrated Product", 0x4C: "Tellabs", 0xCD: "Centaur Technology", 0xCE: "Unigen Corporation", 0x4F: "Transcend Information", 0xD0: "Memory Card Technology", 0x51: "CKD Corporation Ltd.", 0x52: "Capital Instruments, Inc.", 0xD3: "Aica Kogyo, Ltd.", 0x54: "Linvex Technology", 0xD5: "MSC Vertriebs GmbH", 0xD6: "AKM Company, Ltd.", 0x57: "Dynamem, Inc.", 0x58: "NERA ASA", 0xD9: "GSI Technology", 0xDA: "Dane-Elec (C Memory)", 0x5B: "Acorn Computers", 0xDC: "Lara Technology", 0x5D: "Oak Technology, Inc.", 0x5E: "Itec Memory", 0xDF: "Tanisys Technology", 0xE0: "Truevision", 0x61: "Wintec Industries", 0x62: "Super PC Memory", 0xE3: "MGV Memory", 0x64: "Galvantech", 0xE5: "Gadzoox Nteworks", 0xE6: "Multi Dimensional Cons.", 0x67: "GateField", 0x68: "Integrated Memory System", 0xE9: "Triscend", 0xEA: "XaQti", 0x6B: "Goldenram", 0xEC: "Clear Logic", 0x6D: "Cimaron Communications", 0x6E: "Nippon Steel Semi. Corp.", 0xEF: "Advantage Memory", 0x70: "AMCC", 0xF1: "LeCroy", 0xF2: "Yamaha Corporation", 0x73: "Digital Microwave", 0xF4: "NetLogic Microsystems", 0x75: "MIMOS Semiconductor", 0x76: "Advanced Fibre", 0xF7: "BF Goodrich Data.", 0xF8: "Epigram", 0x79: "Acbel Polytech Inc.", 0x7A: "Apacer Technology", 0xFB: "Admor Memory", 0x7C: "FOXCONN", 0xFD: "Quadratics Superconductor", 0xFE: "3COM", }, { 0x01: "Camintonn Corporation", 0x02: "ISOA Incorporated", 0x83: "Agate Semiconductor", 0x04: "ADMtek Incorporated", 0x85: "HYPERTEC", 0x86: "Adhoc Technologies", 0x07: "MOSAID Technologies", 0x08: "Ardent Technologies", 0x89: "Switchcore", 0x8A: "Cisco Systems, Inc.", 0x0B: "Allayer Technologies", 0x8C: "WorkX AG", 0x0D: "Oasis Semiconductor", 0x0E: "Novanet Semiconductor", 0x8F: "E-M Solutions", 0x10: "Power General", 0x91: "Advanced Hardware Arch.", 0x92: "Inova Semiconductors GmbH", 0x13: "Telocity", 0x94: "Delkin Devices", 0x15: "Symagery Microsystems", 0x16: "C-Port Corporation", 0x97: "SiberCore Technologies", 0x98: "Southland Microsystems", 0x19: "Malleable Technologies", 0x1A: "Kendin Communications", 0x9B: "Great Technology Microcomputer", 0x1C: "Sanmina Corporation", 0x9D: "HADCO Corporation", 0x9E: "Corsair", 0x1F: "Actrans System Inc.", 0x20: "ALPHA Technologies", 0xA1: "Cygnal Integrated Products Incorporated", 0xA2: "Artesyn Technologies", 0x23: "Align Manufacturing", 0xA4: "Peregrine Semiconductor", 0x25: "Chameleon Systems", 0x26: "Aplus Flash Technology", 0xA7: "MIPS Technologies", 0xA8: "Chrysalis ITS", 0x29: "ADTEC Corporation", 0x2A: "Kentron Technologies", 0xAB: "Win Technologies", 0x2C: "ASIC Designs Inc", 0xAD: "Extreme Packet Devices", 0xAE: "RF Micro Devices", 0x2F: "Siemens AG", 0xB0: "Sarnoff Corporation", 0x31: "Itautec Philco SA", 0x32: "Radiata Inc.", 0xB3: "Benchmark Elect. (AVEX)", 0x34: "Legend", 0xB5: "SpecTek Incorporated", 0xB6: "Hi/fn", 0x37: "Enikia Incorporated", 0x38: "SwitchOn Networks", 0xB9: "AANetcom Incorporated", 0xBA: "Micro Memory Bank", 0x3B: "ESS Technology", 0xBC: "Virata Corporation", 0x3D: "Excess Bandwidth", 0x3E: "West Bay Semiconductor", 0xBF: "DSP Group", 0x40: "Newport Communications", 0xC1: "Chip2Chip Incorporated", 0xC2: "Phobos Corporation", 0x43: "Intellitech Corporation", 0xC4: "Nordic VLSI ASA", 0x45: "Ishoni Networks", 0x46: "Silicon Spice", 0xC7: "Alchemy Semiconductor", 0xC8: "Agilent Technologies", 0x49: "Centillium Communications", 0x4A: "W.L. Gore", 0xCB: "HanBit Electronics", 0x4C: "GlobeSpan", 0xCD: "Element 14", 0xCE: "Pycon", 0x4F: "Saifun Semiconductors", 0xD0: "Sibyte, Incorporated", 0x51: "MetaLink Technologies", 0x52: "Feiya Technology", 0xD3: "I & C Technology", 0x54: "Shikatronics", 0xD5: "Elektrobit", 0xD6: "Megic", 0x57: "Com-Tier", 0x58: "Malaysia Micro Solutions", 0xD9: "Hyperchip", 0xDA: "Gemstone Communications", 0x5B: "Anadyne Microelectronics", 0xDC: "3ParData", 0x5D: "Mellanox Technologies", 0x5E: "Tenx Technologies", 0xDF: "Helix AG", 0xE0: "Domosys", 0x61: "Skyup Technology", 0x62: "HiNT Corporation", 0xE3: "Chiaro", 0x64: "MCI Computer GMBH", 0xE5: "Exbit Technology A/S", 0xE6: "Integrated Technology Express", 0x67: "AVED Memory", 0x68: "Legerity", 0xE9: "Jasmine Networks", 0xEA: "Caspian Networks", 0x6B: "nCUBE", 0xEC: "Silicon Access Networks", 0x6D: "FDK Corporation", 0x6E: "High Bandwidth Access", 0xEF: "MultiLink Technology", 0x70: "BRECIS", 0xF1: "World Wide Packets", 0xF2: "APW", 0x73: "Chicory Systems", 0xF4: "Xstream Logic", 0x75: "Fast-Chip", 0x76: "Zucotto Wireless", 0xF7: "Realchip", 0xF8: "Galaxy Power", 0x79: "eSilicon", 0x7A: "Morphics Technology", 0xFB: "Accelerant Networks", 0x7C: "Silicon Wave", 0xFD: "SandCraft", 0xFE: "Elpida", }, { 0x01: "Solectron", 0x02: "Optosys Technologies", 0x83: "Buffalo (Formerly Melco)", 0x04: "TriMedia Technologies", 0x85: "Cyan Technologies", 0x86: "Global Locate", 0x07: "Optillion", 0x08: "Terago Communications", 0x89: "Ikanos Communications", 0x8A: "Princeton Technology", 0x0B: "Nanya Technology", 0x8C: "Elite Flash Storage", 0x0D: "Mysticom", 0x0E: "LightSand Communications", 0x8F: "ATI Technologies", 0x10: "Agere Systems", 0x91: "NeoMagic", 0x92: "AuroraNetics", 0x13: "Golden Empire", 0x94: "Muskin", 0x15: "Tioga Technologies", 0x16: "Netlist", 0x97: "TeraLogic", 0x98: "Cicada Semiconductor", 0x19: "Centon Electronics", 0x1A: "Tyco Electronics", 0x9B: "Magis Works", 0x1C: "Zettacom", 0x9D: "Cogency Semiconductor", 0x9E: "Chipcon AS", 0x1F: "Aspex Technology", 0x20: "F5 Networks", 0xA1: "Programmable Silicon Solutions", 0xA2: "ChipWrights", 0x23: "Acorn Networks", 0xA4: "Quicklogic", 0x25: "Kingmax Semiconductor", 0x26: "BOPS", 0xA7: "Flasys", 0xA8: "BitBlitz Communications", 0x29: "eMemory Technology", 0x2A: "Procket Networks", 0xAB: "Purple Ray", 0x2C: "Trebia Networks", 0xAD: "Delta Electronics", 0xAE: "Onex Communications", 0x2F: "Ample Communications", 0xB0: "Memory Experts Intl", 0x31: "Astute Networks", 0x32: "Azanda Network Devices", 0xB3: "Dibcom", 0x34: "Tekmos", 0xB5: "API NetWorks", 0xB6: "Bay Microsystems", 0x37: "Firecron Ltd", 0x38: "Resonext Communications", 0xB9: "Tachys Technologies", 0xBA: "Equator Technology", 0x3B: "Concept Computer", 0xBC: "SILCOM", 0x3D: "3Dlabs", 0x3E: "ct Magazine", 0xBF: "Sanera Systems", 0x40: "Silicon Packets", 0xC1: "Viasystems Group", 0xC2: "Simtek", 0x43: "Semicon Devices Singapore", 0xC4: "Satron Handelsges", 0x45: "Improv Systems", 0x46: "INDUSYS GmbH", 0xC7: "Corrent", 0xC8: "Infrant Technologies", 0x49: "Ritek Corp", 0x4A: "empowerTel Networks", 0xCB: "Hypertec", 0x4C: "Cavium Networks", 0xCD: "PLX Technology", 0xCE: "Massana Design", 0x4F: "Intrinsity", 0xD0: "Valence Semiconductor", 0x51: "Terawave Communications", 0x52: "IceFyre Semiconductor", 0xD3: "Primarion", 0x54: "Picochip Designs Ltd", 0xD5: "Silverback Systems", 0xD6: "Jade Star Technologies", 0x57: "Pijnenburg Securealink", 0x58: "MemorySolutioN", 0xD9: "Cambridge Silicon Radio", 0xDA: "Swissbit", 0x5B: "Nazomi Communications", 0xDC: "eWave System", 0x5D: "Rockwell Collins", 0x5E: "PAION", 0xDF: "Alphamosaic Ltd", 0xE0: "Sandburst", 0x61: "SiCon Video", 0x62: "NanoAmp Solutions", 0xE3: "Ericsson Technology", 0x64: "PrairieComm", 0xE5: "Mitac International", 0xE6: "Layer N Networks", 0x67: "Atsana Semiconductor", 0x68: "Allegro Networks", 0xE9: "Marvell Semiconductors", 0xEA: "Netergy Microelectronic", 0x6B: "NVIDIA", 0xEC: "Internet Machines", 0x6D: "Peak Electronics", 0xEF: "Accton Technology", 0x70: "Teradiant Networks", 0xF1: "Europe Technologies", 0xF2: "Cortina Systems", 0x73: "RAM Components", 0xF4: "Raqia Networks", 0x75: "ClearSpeed", 0x76: "Matsushita Battery", 0xF7: "Xelerated", 0xF8: "SimpleTech", 0x79: "Utron Technology", 0x7A: "Astec International", 0xFB: "AVM gmbH", 0x7C: "Redux Communications", 0xFD: "Dot Hill Systems", 0xFE: "TeraChip", }, { 0x01: "T-RAM Incorporated", 0x02: "Innovics Wireless", 0x83: "Teknovus", 0x04: "KeyEye Communications", 0x85: "Runcom Technologies", 0x86: "RedSwitch", 0x07: "Dotcast", 0x08: "Silicon Mountain Memory", 0x89: "Signia Technologies", 0x8A: "Pixim", 0x0B: "Galazar Networks", 0x8C: "White Electronic Designs", 0x0D: "Patriot Scientific", 0x0E: "Neoaxiom Corporation", 0x8F: "3Y Power Technology", 0x10: "Europe Technologies", 0x91: "Potentia Power Systems", 0x92: "C-guys Incorporated", 0x13: "Digital Communications Technology Incorporated", 0x94: "Silicon-Based Technology", 0x15: "Fulcrum Microsystems", 0x16: "Positivo Informatica Ltd", 0x97: "XIOtech Corporation", 0x98: "PortalPlayer", 0x19: "Zhiying Software", 0x1A: "Direct2Data", 0x9B: "Phonex Broadband", 0x1C: "Skyworks Solutions", 0x9D: "Entropic Communications", 0x9E: "Pacific Force Technology", 0x1F: "Zensys A/S", 0x20: "Legend Silicon Corp.", 0xA1: "sci-worx GmbH", 0xA2: "Oasis Silicon Systems", 0x23: "Renesas Technology", 0xA4: "Raza Microelectronics", 0x25: "Phyworks", 0x26: "MediaTek", 0xA7: "Non-cents Productions", 0xA8: "US Modular", 0x29: "Wintegra Ltd", 0x2A: "Mathstar", 0xAB: "StarCore", 0x2C: "Oplus Technologies", 0xAD: "Mindspeed", 0xAE: "Just Young Computer", 0x2F: "Radia Communications", 0xB0: "OCZ", 0x31: "Emuzed", 0x32: "LOGIC Devices", 0xB3: "Inphi Corporation", 0x34: "Quake Technologies", 0xB5: "Vixel", 0xB6: "SolusTek", 0x37: "Kongsberg Maritime", 0x38: "Faraday Technology", 0xB9: "Altium Ltd.", 0xBA: "Insyte", 0x3B: "ARM Ltd.", 0xBC: "DigiVision", 0x3D: "Vativ Technologies", 0x3E: "Endicott Interconnect Technologies", 0xBF: "Pericom", 0x40: "Bandspeed", 0xC1: "LeWiz Communications", 0xC2: "CPU Technology", 0x43: "Ramaxel Technology", 0xC4: "DSP Group", 0x45: "Axis Communications", 0x46: "Legacy Electronics", 0xC7: "Chrontel", 0xC8: "Powerchip Semiconductor", 0x49: "MobilEye Technologies", 0x4A: "Excel Semiconductor", 0xCB: "A-DATA Technology", 0x4C: "VirtualDigm", }, ] memory_types = { 1: "STD FPM DRAM", 2: "EDO", 3: "Pipelined Nibble", 4: "SDRAM", 5: "ROM", 6: "DDR SGRAM", 7: "DDR SDRAM", 8: "DDR2 SDRAM", 9: "DDR2 SDRAM FB-DIMM", 10: "DDR2 SDRAM FB-DIMM PROBE", 11: "DDR3 SDRAM", 12: "DDR4 SDRAM", } module_types = { 1: "RDIMM", 2: "UDIMM", 3: "SODIMM", 4: "Micro-DIMM", 5: "Mini-RDIMM", 6: "Mini-UDIMM", } ddr3_module_capacity = { 0: 256, 1: 512, 2: 1024, 3: 2048, 4: 4096, 5: 8192, 6: 16384, 7: 32768, } ddr3_dev_width = { 0: 4, 1: 8, 2: 16, 3: 32, } ddr3_ranks = { 0: 1, 1: 2, 2: 3, 3: 4 } ddr3_bus_width = { 0: 8, 1: 16, 2: 32, 3: 64, } def speed_from_clock(clock): return int(clock * 8 - (clock * 8 % 100)) def decode_manufacturer(index, mfg): index &= 0x7f try: return jedec_ids[index][mfg] except (KeyError, IndexError): return 'Unknown ({0}, {1})'.format(index, mfg) def decode_spd_date(year, week): if year == 0 and week == 0: return 'Unknown' return '20{0:02x}-W{1:x}'.format(year, week) class SPD(object): def __init__(self, bytedata): """Parsed memory information Parse bytedata input and provide a structured detail about the described memory component :param bytedata: A bytearray of data to decode :return: """ self.rawdata = bytearray(bytedata) spd = self.rawdata self.info = {'memory_type': memory_types.get(spd[2], 'Unknown')} if spd[2] == 11: self._decode_ddr3() elif spd[2] == 12: self._decode_ddr4() def _decode_ddr3(self): spd = self.rawdata finetime = (spd[9] >> 4) / (spd[9] & 0xf) fineoffset = spd[34] if fineoffset & 0b10000000: # Take two's complement for negative offset fineoffset = 0 - ((fineoffset ^ 0xff) + 1) fineoffset = (finetime * fineoffset) * 10**-3 mtb = spd[10] / float(spd[11]) clock = 2 // ((mtb * spd[12] + fineoffset)*10**-3) self.info['speed'] = speed_from_clock(clock) self.info['ecc'] = (spd[8] & 0b11000) != 0 self.info['module_type'] = module_types.get(spd[3] & 0xf, 'Unknown') sdramcap = ddr3_module_capacity[spd[4] & 0xf] buswidth = ddr3_bus_width[spd[8] & 0b111] sdramwidth = ddr3_dev_width[spd[7] & 0b111] ranks = ddr3_ranks[(spd[7] & 0b111000) >> 3] self.info['capacity_mb'] = sdramcap / 8 * buswidth / sdramwidth * ranks self.info['manufacturer'] = decode_manufacturer(spd[117], spd[118]) self.info['manufacture_location'] = spd[119] self.info['manufacture_date'] = decode_spd_date(spd[120], spd[121]) self.info['serial'] = hex(struct.unpack( '>I', struct.pack('4B', *spd[122:126]))[0])[2:].rjust(8, '0') self.info['model'] = struct.pack('18B', *spd[128:146]).strip( '\x00\xff ') def _decode_ddr4(self): spd = self.rawdata if spd[17] == 0: fineoffset = spd[125] if fineoffset & 0b10000000: fineoffset = 0 - ((fineoffset ^ 0xff) + 1) clock = 2 // ((0.125 * spd[18] + fineoffset * 0.001) * 0.001) self.info['speed'] = speed_from_clock(clock) else: self.info['speed'] = 'Unknown' self.info['ecc'] = (spd[13] & 0b11000) == 0b1000 self.info['module_type'] = module_types.get(spd[3] & 0xf, 'Unknown') sdramcap = ddr3_module_capacity[spd[4] & 0xf] buswidth = ddr3_bus_width[spd[13] & 0b111] sdramwidth = ddr3_dev_width[spd[12] & 0b111] ranks = ddr3_ranks[(spd[12] & 0b111000) >> 3] self.info['capacity_mb'] = sdramcap / 8 * buswidth / sdramwidth * ranks self.info['manufacturer'] = decode_manufacturer(spd[320], spd[321]) self.info['manufacture_location'] = spd[322] self.info['manufacture_date'] = decode_spd_date(spd[323], spd[324]) self.info['serial'] = hex(struct.unpack( '>I', struct.pack('4B', *spd[325:329]))[0])[2:].rjust(8, '0') self.info['model'] = struct.pack('18B', *spd[329:347]).strip( '\x00\xff ')