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STMicroelectronics STB1 Extended HARP (mb350)

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Extended HARP

Details of switch settings.

General Information

This board offers 5 PCI slots, 1 slot at 3.3V and 4 slots at 5V. The board has 32Megs available on the LMI, 16Megs on the EMI, and 8megs of FLASH. The board features an Hitachi HD64465 peripheral chip, which provides some useful peripherals, not all of which are supported. In use, this board has proved to be very stable.

PS/2 Keyboard	Fully supported
PS/2 Mouse	Fully supported
PCMCIA slots	I/O cards only
On board USB	Not Supported
Hitachi serial port (not SCIF)	Fully Supported
On board IR	Not supported

Known problems with this board

These problems refer to Revision B boards only, revision A boards are not supported, unless they have been modified to RevB.

Missing pullups on PERR and SERR on secondary PCI bus
Insufficient power to 3.3V slot
No -12V supply to PCI

The missing pullups should have been added to the board before shipping. Look for some very small resistors soldered directly onto the pins of the first 5V slot. They are very hard to spot, but if they are not there, the kernel will complain about spurious PCI interrupts.

The power problem is that there is a separate power supply for the 3.3V slot, which is only a couple of amps. Boards that take a lot of power,such as graphics boards, will draw too much power, and the whole board will most likely not work. The fix is to power the 3.3V slot from an external power supply via the header on the board.

The lack of a -12V supply is not usually a problem, except for sound cards which require -12V for the analogue output stage!

If the MB350 is in a nice metal box, all of the above problems will have been fixed, as the box has an ATX power supply with appropriate cabling to fix the above problems.

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