[U-Boot] [PATCH v4 3/6] mcx: Disable DCACHE since USB EHCI is enabled

Ilya Yanok
2012-06-27T22:28:29Z

Hi,

21.06.2012 02:14, Tom Rini wrote:
> USB EHCI and DCACHE are not compatible, so disable DCACHE support at
> build-time as run-time disable is insufficient for USB use.

Sorry for missing this discussion. I think compile-time disabling of the
cache is too brutal.
ehci-hcd cache handling is broken anyway: doing unaligned
flushes/invalidates is a bug, and we know for sure that upper layers
don't care about alignment (and I bet ehci-hcd does this even for its
internal buffers). So what's the point in all this cache handling in
ehci-hcd? It's not going to work anyway and just produces problems. So I
suggest to just disable all this stuff until generic code will be fixed.
Alternatively we can do bounce-buffering inside driver.

Regards, Ilya.