mvme2307 bsp / dec21140 questions
strauman at SLAC.Stanford.EDU
Thu Aug 2 00:27:58 UTC 2001
Till Straumann wrote:
> Then, on the powerPC there is always the cache issue
> when dealing with devices. As far as I can see, the BSP
> runs with caches enabled both, in HID0 and in DBAT0.
> However, the network chip driver (libchip/dec21140.c)
> doesn't seem to care about flushing (TX) or invalidating (RX)
> cache entries and yet it seems to work - is this just
> luck or am I missing something?
Well, I guess I can answer this one myself: the 604 and the
raven do snooping :-)
My last project involved a MPC860 which does not
implement snooping and the programmer has to take
care of coherency. Dealing with this for some time
obviously drove me quite paranoid...
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