[U-Boot-Users] mpc8260 currently has no ...

[Matthew Millman]

Whoops... completely forgot about the extra crap

I'm sure that disabling cache is not common practice due to the 50 odd
percent performance hit, however I still don't see how PCI could possibly
work on the mpc8260 with address translation completely disabled, as all
reads/writes to PCI get cached and re-ordered, and with no infrastructure
for setting up BATs so I can set the cache inhibit and guarded option on
that memory region???

It wouldn't be a big issue to just define BATs, except for generating a rift
between the pristine U-Boot and mine, I'm more interested as to weather
there's some other trick out there that I haven't spotted.

In message <44D86F56.7A9D.00CE.0 at alliedtelesyn.co.nz> you wrote:
> Just recently I had an attempt to use a couple of PIC NICs (pcnet & e100)
on my mpc8272 target (using as mpc8260 in u‑boot)
>
> Both work correctly but only after disabling ALL cache which isn't exactly
desirable, so there's all this code for the mpc8260 PCI but no traces of any
BAT setups for this CPU, is anyone else using PCI devices on the mpc8260
without going all out and wr
> iting out BAT configurations, or is common practice to disable the cache?

Please use a line length of 72 or less characters. Thanks.

No, it is NOT common practice to disable the caches in  general.  See
the README for details.

> NOTICE: This message contains privileged and confidential

And omit this when posting here. Use  a  different  mail  account  if
necessary. There are enough free mail services without such crap.

Best regards,

Wolfgang Denk

‑‑
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
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