On Mon, Nov 28, 2011 at 12:18 AM, Mans Rullgard <mans.rullg...@linaro.org> wrote: > On 27 November 2011 21:30, Siarhei Siamashka > <siarhei.siamas...@gmail.com> wrote: >> On Sun, Nov 27, 2011 at 8:18 PM, Woodruff, Richard <r-woodru...@ti.com> >> wrote: >>> >>>> From: linaro-dev-boun...@lists.linaro.org [mailto:linaro-dev- >>>> boun...@lists.linaro.org] On Behalf Of Mans Rullgard >>> >>>> >> Do you have an erratum number for this? >>>> >> >>>> > This was very recent BUG and not yet made it to the public errata >>>> > numbers. Most likely next PL310 errata update should have >>>> > this one documented. >>>> >>>> Do you have _any_ identifier for it? >>> >>> ARM expanded errata 752271 to cover DLF not working till r3p2 in errata >>> version 13.1 (21 Nov 11), 4460 is r3p1-50rel0 and is impacted. >> >> Thanks a lot. Your posts are very informative as usual. >> >> By the way, do you know whether it is safe to use "SCU Speculative >> linefills" with Cortex-A9 r2pX and PL310 r3pX? >> http://infocenter.arm.com/help/topic/com.arm.doc.ddi0407f/BABEBFBH.html >> >> As a quick and dirty test, it can be enabled in >> 'arch/arm/kernel/smp_scu.c' by just setting extra (1 << 3) bit in SCU >> Control Register from 'scu_enable' function. > > The SCU is already enabled when that function runs (don't know what > enables it), so you'll need to remove the early return to make any > changes.
Do you mean SCU is enabled and has "SCU Speculative linefills enable" bit already set on OMAP4460? Or just SCU is enabled without speculative linefills? In my case (origenboard), 'scu_enable' function seems to be called just once and the value in SCU Control Register is originally 0x00000000. So SCU gets enabled without speculative linefills when using the current linaro u-boot and kernel. And I thought that speculative linefills might be not enabled on purpose. But I guess this is actually a question for Samsung folks. > I'm not aware of any errata affecting this feature on 4460, > nor have I seen any bad behaviour while running with it enabled, and > I do get a slight performance increase in Libav benchmarks. Thanks, that's good to know. -- Best regards, Siarhei Siamashka _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
