Motorola MVME2300 Series 用户手册

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Computer Group Literature Center Web Site

Universe (VMEbus to PCI) Chip

"Following are the most recently discovered bugs which will be
addressed in Universe 1.1.

1. LSIO image

Description: After a PCI reset, the LSIO image is still enabled, but the
base, bound, and translation offset changes value.

Workaround: None."

Motorola Firmware Engineering has implemented Method 1 in its
firmware workaround in PPCBug debugger release 3.1.

Note

As mentioned at the start of this section, the preceding notes
describing this Universe chip PCI reset problem are meant to
assist those customers who replace the MCG firmware with their
own, or who overwrite the firmware settings for the Universe
chip. Customers who do that may encounter this problem.

Those who leave Motorola’s PPCBug firmware intact should not
experience any difficulties.

Examples

In this section you will find some representative solutions implemented as
workarounds for the Universe PCI reset problem described above.

Example 1: MVME2600 Series Board Exhibits PCI Reset Problem

Use an MVME2600 series board to exhibit the problem.

Conditions:

The board is an MVME260x running PPCOF2.0 Ir05. All the
Universe code which initializes the Universe has been disabled (the
driver code, not the PCI code). The Probe list has been modified to
d,c,e,f,10. The env parameters are set such that an LSI0 image will be
enabled.

Procedure: