[PATCH v8 2/2] arm-soc: Add support for arm-based tango4 platforms

[Måns Rullgård]

Marc Gonzalez <marc_gonzalez at sigmadesigns.com> writes:

> Santosh Shilimkar wrote:
>
>> Mark Rutland wrote:
>> 
>>> We didn't. Having a look just now, the earliest example appears to be
>>> in OMAP4 L2 support patches back in 2009 [1]. I was not able to find a
>>> rationale.
>>> 
>>> Given that the MMU is on (and speculative accesses are permitted) I
>>> can't see what the DSB achieves -- it can't quiesce the memory system.
>>> 
>>> Santosh, any idea?
>>
>> IIRC, it was requirement from the OMAP ROM code to have a dsb before
>> we call the SMC routine. I can't recollect more than that now.
>
> In that case, shouldn't dsb have been added to the ROM code,
> on the "other side" of the smc, so as to not depend on Linux
> code "getting it right"?

You're new to this, aren't you? :)

-- 
Måns Rullgård
mans at mansr.com