vme_tsi148 question

Martyn Welch martyn at welchs.me.uk
Sat Dec 28 00:23:48 UTC 2013


On 27/12/13 20:15, Michael Kenney wrote:
> We are using the vme_tsi148 bridge driver along with the vme_user
> driver to access the VME boards. The A/D board requires D32 bus cycles
> and the VME master window is configured accordingly, however, when
> monitoring the bus cycles with a logic analyzer, we noticed that the
> CPU is transferring one byte at a time (i.e. four D8 transfers rather
> than one D32).
>
> Is this the expected behavior of the tsi148 driver?
>

Hi Mike,

This is certainly not the expected behaviour - if the window is 
configured for D32 then it should do 32 bit transfers where possible.

I've heard of this happening recently, but haven't yet been able to 
replicate it. Which VME board are you running Linux on and which flavour 
of Linux?

> If there is a more appropriate mailing-list for this question, please
> let me know.
>

This is the correct list.

Martyn



More information about the devel mailing list