[Maverick] [ti-omap4] SRU: A workaround for highmem issue on OMAP4 platform

[Bryan Wu]

On Fri, Oct 1, 2010 at 11:56 AM, Ricardo Salveti de Araujo
<rsalveti at rsalveti.net> wrote:
> On Thu, Sep 30, 2010 at 11:14:34PM +0200, Dechesne, Nicolas wrote:
>> Santosh,
>>
>> > CONFIG_PL310_ERRATA_588369 errata is pretty much must for OMAP4 ES1.0. This
>> > should always be enabled on OMAP4 ES1.0 not to see any undefined behaviour.
>>
>> but we are on ES2.0, not ES1.0. What is the impact of enabling this errata on ES2.0?
>
> From the talk I had with Rob Clark:
>
> <robclark> ndec / rsalveti: which errata?
> <rsalveti> robclark: PL310_ERRATA_588369
> <robclark> ok.. let me check
> <robclark> rsalveti: ok.. this one seems to apply to the cortex-a9 IP, prior to r2p0
> <robclark> (just need to check which rev on cortex is in es2.0)
> <robclark> r1p2.. so keep the errata enabled
>

I was confused here, if the errata is apply to cortex-a9 IP prior to
r2p0, r1p2 silicon is supposed to fix this issue in hardware. Do we
still need this in software?

-Bryan

> So it seems we're OK with it.
>
> And during my tests I was finally able to run for more than 28 hours (14 builds)
> without getting any errors, so it seems that it's finally better.
>

Thanks a lot for the testing.

> But unfortunatelly I can easily get errors when using highmem, no matter what
> setup I'm using, so probably a different issue.
>
> Good thing is that it seems we finally got a workaround to use 1GB at
> Maverick.
>
> Cheers,
> --
> Ricardo Salveti de Araujo
>
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