HP XM600 - Kayak - 128 MB RAM Technical Reference Manual page 58

HP MaxiLife Hardware
Monitoring Chip
Test Sequence and
Error Messages
2 System Board
The Input/Output Controller Hub (82801AA)
MaxiLife is a hardware monitoring chip which is resident on the system
board. Its responsibility includes On/Off and reset control, status panel
management (LEDs), hardware monitoring (temperature and voltage),
early diagnostics (CPU, memory, PLLs, boot start), run-time diagnostics
(CPU errors), and other miscellaneous functions (such as special OK/FAIL
symbols based on a smiling face for the Kayak XM600 Series 2 Minitower
models).
The integrated microprocessor includes a Synopsys cell based on Dallas
"8052" equivalent, a 2 KB boot ROM, 256 bytes of data RAM, an I
Analog-to-Digital (ADC) with 5 entries, and an additional glue logic for
interrupt control, fan regulation, and a status panel control.
MaxiLife downloads its code in 96 milliseconds from an I
The total firmware (MaxiLife 8051-code, running in RAM) size is 14 KB. As
it exceeds the 2 KB program RAM space, a paging mechanism will swap
code as it is required, based on a 512 byte buffer. The first 2 KB pages of
firmware code is critical because it controls the initial power on/reset to
boot the system. This initial page is checked with a null-checksum test and
the presence of MaxiLife markers (located just below the 2 KB limit).
MaxiLife is not accessible in I/O space or memory space of the system
platform, but only through the SMBUS (which is a sub-set of the I
2
via the ICH. Its I C cell may operate either in Slave or Master mode,
switched by firmware, or automatically in the event of 'Arbitration' loss.
As a monitoring chip, MaxiLife reports critical errors at start-up, and is
therefore powered by Vstandby (3.3V) power. For MaxiLife to work
correctly, the PC Workstation must always be connected to a grounded
outlet. This enables the PC Workstation's hardware monitoring chip to be
active, even if the system has been powered off.
Refer to "MaxiLife Test Sequence and Error Messages" on page 119
detailed information about the different test sequences and error messages
58
2
C cell, an
2
C serial EEPROM.
2
C bus),
for