Parts List

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TWSI

Address ChipLoc PartNum Description Useful links
TWSI 0x1b u17 TC654 Microchip fan controller. Datasheet
TWSI 0x64 u15 PCF8563 RTC. Datasheet
TWSI 0x48 u16 LM75BIMM-3 temperature sensor. Datasheet
TWSI 0x51  ?  ? Most likely U2 (custom bootrom, perhaps).

I don't think 0x51 is U2 (or indeed U1 or U3). These are identified below as programmable regulators, but the interface on them is not I2C. B22824@prtnx.com 17:54, 20 June 2011 (UTC)

Other

ChipLocation PartNumber Description Useful Links
U10 88F6281 SoC
U18 88E1116R-NNC1 Gigabit Ethernet
U6, U7 74hct132d Quad 2-input NAND Schmitt Trigger.
U8, 74hct74d Dual D-type flip-flop with set and reset.
U1, U3 88PG8227 Programmable Voltage Regulators
U11, U12 K4T51163QG 64MB DDR2 SDRAM x 2
T11 LAN3219 Transformer, NIC isolation
Q4 78D05L 5v regulator
U14 K9F2G08U0B 256MB NAND Memory
U19 TPS2065 1 Amp solid state switch (controls power to the unit)

Unknown

ChipLocation PartNumber Description
Q3, Q5 BA9S1L? By the identifier assumed to be a transistor array or a fet. Maybe controls power up sequence.
U2 MRVL H101 9251 This is the one we need to know. Made by Marvell. It's a 88PH8101 voltage regulator.
Q8 AJ3AF FDS 6678AZ Another FET.