Battery Firmware Hacking - Hacker Halted

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Full access mode All SBS commands All commands have read/write access Can enter BootROM and Configuration mode Apple firmware updates do not enter this mode Sunday, October 2, 11
Configuration mode By issuing SMBus commands (see slua355b) you tell the battery what levels of current, voltage, temp it is currently receiving It then makes internal changes to align itself with these values write_word(0, 0x40); //enter calibrate mode from full access mode write_word(0x63, n); //n = number of cells write_word(0x60, n); //n = current write_word(0x61, n); //n = voltage write_word(0x62, n); //n = temp write_word(0x51, 0xc0d5); //calibrate device. read_word(0x52, y); //y = bit field, whats calibrated. (poll with this) send_byte(0x72); send_byte(0x73); //transfer results to data flash //exit Calibration mode. Sunday, October 2, 11
Page 1 and 2: Battery Firmware Hacking Charlie Mi
Page 3 and 4: About me Former US National Securit
Page 5 and 6: Spoiler I didn’t blow up batterie
Page 7 and 8: Smart battery “Safety is a primar
Page 9 and 10: Possible Battery Attacks Brick batt
Page 11 and 12: How to start I suck at hardware, so
Page 13 and 14: AppleSmartBattery Is part of PowerM
Page 15 and 16: One odd thing What’s up with 0x36
Page 17 and 18: Double win! We now know its some ki
Page 19 and 20: Double win! We now know its some ki
Page 21 and 22: Data flash signature SubclassID:byt
Page 27 and 28: Step 2 Sunday, October 2, 11
Page 29 and 30: Step 4 Chips and stuff Sunday, Octo
Page 31 and 32: Thx: Travis Goodspeed Sunday, Octob
Page 33 and 34: Sunday, October 2, 11
Page 35 and 36: Digression We now know what kind of
Page 37 and 38: Using the API Sunday, October 2, 11
Page 39 and 40: Lots to do! There are many interest
Page 41 and 42: Different modes Sealed Unsealed Ful
Page 43: Unsealed Access to Data Flash space
Page 47 and 48: Other calibrations? Sunday, October
Page 49 and 50: Other calibrations? Yes, I’m a pr
Page 51 and 52: q20z80evm-001 An evaluation system
Page 53 and 54: The software Sunday, October 2, 11
Page 55 and 56: Data flash Sunday, October 2, 11
Page 57 and 58: EVM It can flash the firmware with
Page 59 and 60: Introspection Wrote a PyDbg script
Page 61 and 62: Google again Googling these types o
Page 63 and 64: Boot ROM - mostly ok See how to wri
Page 65 and 66: Let’s ask TI! Sunday, October 2,
Page 67 and 68: Plz! Sunday, October 2, 11
Page 69 and 70: Intellectual property - Here I come
Page 71 and 72: Intellectual property - Here I come
Page 73 and 74: 3 byte aligned Probably 3 byte alig
Page 75 and 76: 3 byte aligned Probably 3 byte alig
Page 77 and 78: The end Ends in 23 ff ff Then lots
Page 85 and 86: Back to google Sunday, October 2, 1
Page 87 and 88: CoolRISC 816 8-bit micro controller
Page 89 and 90: Instruction set Sunday, October 2,
Page 91 and 92: IDA! Create a few small sections, o
Page 93 and 94: More IDA Initial disassembly doesn
Page 95 and 96:
Boot ROM Problems Now can dump and
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Battery wasteland Sunday, October 2
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Try an off-market knockoff Actually
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Problem 2 If you patch a few bytes
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Checksum checker (old) Sunday, Octo
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Disable checksum Older: Set stored
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Patch it! patch_firmware function p
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Sniffing SMBus Bought some (more) h
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Spaghetti wire fail Sunday, October
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Pop the keyboard Sunday, October 2,
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i2c decoding Write, SBS command 0x8
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Beagle data Sunday, October 2, 11
Page 119 and 120:
Implications Brick the battery Chan
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Firmware changes It might be intere
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SMBus MITM Remaining Capacity (0xf)
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We redirect to cases 1b-1c int work
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Re-sniffing Shows all values querie
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Deal breaker? MU092X Thermal cutoff
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Fuzzing the SMBus Options Write a f
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Caulkgun source - guts #include #i
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Battery Firmware Hacking - Hacker Halted

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