Un-Setting VME3PCI Master Master Enable on MVME2431

Gabriel Paubert paubert at iram.es
Fri Apr 23 21:23:25 EST 1999

On Fri, 23 Apr 1999, David De Ridder wrote:

>  I have a report concerning VME3PCI myself : when it is set to ``N'',
>  the ``SYSFAIL'' LED in our crate lights, and stays lit. I have been
>  told this is bad, because it indicates that there will be no VME
>  transfers possible between the MVME board and other VME devices.
>  However, once the universe driver is loaded (e.g., through modprobe),
>  the LED unlights. I assume this is because the Universe chipset is
>  then correctly initialised, right ?

Indeed. The driver resets the SYSFAIL signal and the associated pending
interrupts on init (Actually Universe initialization is a very complex
topic, it's easy to get conflicts in PCI memory space).

	Gabriel. (progressing slowly on the doc for the Universe driver)

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