[U-Boot] [RFC/PATCH] davinci: disable dcache on boards with EMAC

[Christian Riesch]

Hi,

On Sun, Nov 27, 2011 at 5:41 PM, Tom Rini <tom.rini at gmail.com> wrote:
> On Sun, Nov 27, 2011 at 8:09 AM, Wolfgang Denk <wd at denx.de> wrote:
>> In message <1321048618-20616-1-git-send-email-yanok at emcraft.com> you wrote:
>>> DaVinci EMAC driver has no support for running with D-Cache enabled so
>>> disable D-Cache on all DaVinci boards with EMAC device.
>>>
>>> Signed-off-by: Ilya Yanok <yanok at emcraft.com>
>>> ---
>>>
>>> I can't test it on any DaVinci boards right now but my understanding
>>> is that currently EMAC driver can't work properly with D-Cache enabled.

[...]

>> Why do we have to permanently disable the data cache just because the
>> network driver is broken?  USB is also broken, and probably other
>> drivers as well.
>
> To be clear, the problem is that today the driver is broken (not cache
> safe) and this series of patches fixes that problem.  In doing so we
> expose that arm926ejs doesn't have complete cache support today.

What do you mean by "broken"? Is it "never working" or is it "working
sometimes" or "not working under specific conditions"? I have a DA850
based board and I use the Davinci EMAC driver (CONFIG_DRIVER_TI_EMAC).
I don't have these CONFIG_SYS_xCACHE_OFF defines in my board config
file so I guess D-Cache is enabled. But Ethernet works fine, so what
am I missing here? Is D-Cache disabled somewhere else?

Regards, Christian