Parts List

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	Product brief Datasheet
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.