[U-Boot] i.MX51: FEC: Cache coherency problem?

[Matthias Weißer]

Dear Aneesh

Am 18.07.2011 18:16, schrieb Aneesh V:
> commit c2dd0d45540397704de9b13287417d21049d34c6
> armv7: integrate cache maintenance support
>
> In this patch I added a call to dcache_enable() at the beginning of
> board_init_r() for ARM(i.e. as soon as relocation is over). As a result
> D-cache will be enabled for all ARM platforms now unless
> CONFIG_SYS_DCACHE_OFF is set.

Is this really a good idea? This will break a couple of boards using 
non-cache-aware drivers. And there are a couple of them in u-boot. I 
think d-cache should be opt-in rather then opt-out as long as there are 
any drivers which didn't handle cached memory regions correct. i-cache 
is much less problematic and can be enabled by default.

If d-cache will be enabled by default on ARM I think I have to send a 
patch for one of my boards :-)

Regards
Matthias