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SubjectLinux kernel lockup with BVM SCSI controller on MCPN765 PPC board

We have a major problem with using a BVM SCSI controller on a Motorola
MCPN765 PowerPC Compact PCI Motherboard. When the SCSI driver module is
loaded and starts to perform SCSI device interrogation the system will
completely lock up.
It appears that the hardware is locked up, the kernel locks up during
a low level serial console print routine (serial_console_write). No interrupts
occur (we have even disabled interrupts in the serial_console_write routine
to make sure).
The BVM SCSI controller is based on the LSI53C1010-66 chip and we are using the
sym53c8xx_2 SCSI driver (although the same problem occurs with the
sym53c8xx SCSI driver.
We are using MontaVista Linux 2.1 with the 2.4.17 kernel.

Using this SCSI controller board with a Motorola MCP750 PowerPC motherboard
works fine. One of the differences between the Motherboards is that the
MCPN765 has a 66MHz/64bit PCI bus while the MCP750 has a 33MHz/32bit PCI bus.
The MCPN765 uses a Hawk ASIC for Memory/PCI bus control.

We have been attempting to debug the driver to find the cause but have been
hitting brick walls. The system appears to lock up when the SCSI board
is performing a DataIn phase under the control of its on-board SCRIPTS processor.

As the system has completely locked up we have not been able to find the cause.
Any information on possible causes or ideas on how to proceed would be most

Dr Terry Barnaby BEAM Ltd
Phone: +44 1454 324512 Northavon Business Center, Dean Rd
Fax: +44 1454 313172 Yate, Bristol, BS37 5NH, UK
Email: Web:
BEAM for: Visually Impaired X-Terminals, Parallel Processing, Software Dev
"Tandems are twice the fun !"

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