Hi, Am Mittwoch, 4. Januar 2012, 15:29:12 schrieb Olof Johansson: > Only one of the L2 erratas are needed on T30, but T20/25 > needs a few more. can we have a word from someone from NVIDIA about which Tegra versions/revisions need which erratum applied? Currently the kernel has selections for the following errata (on ARM): T2x T30 ERRATA_430973 Stale prediction on replaced interworking branch ERRATA_458693 Processor deadlock when a false hazard is created ERRATA_460075 Data written to the L2 cache can be overwritten with stale data x ERRATA_742230 DMB operation may be faulty ERRATA_742231 Incorrect hazard handling in the SCU may lead to data corruption PL310_ERRATA_588369 Clean & Invalidate maintenance operations do not invalidate clean lines ERRATA_720789 TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID PL310_ERRATA_727915 Background Clean & Invalidate by Way operation can cause data corruption ERRATA_743622 Faulty hazard checking in the Store Buffer may lead to data corruption ERRATA_751472 Interrupted ICIALLUIS may prevent completion of broadcasted operation x PL310_ERRATA_753970 cache sync operation may be faulty ERRATA_754322 possible faulty MMU translations following an ASID switch ERRATA_754327 no automatic Store Buffer drain ERRATA_764369 Data cache line maintenance operation by MVA may not succeed x x PL310_ERRATA_769419 no automatic Store Buffer drain With Olofs patch, the following errata are enabled by tegra_defconfig: 742230(T2x), 753970(T2x), 769419(T2x + T30) I have the feeling that at least 764369 also needs to be enabled. From the description: ... affecting Cortex-A9 MPCore with two or more processors (all current revisions). I wonder if this includes multi *cores*. The TRM is not very detailed about this topic. Having this info will likely remove some headache for non OEM custumers. Marc > > Signed-off-by: Olof Johansson <olof@xxxxxxxxx> > --- > arch/arm/mach-tegra/Kconfig | 4 ++++ > 1 files changed, 4 insertions(+), 0 deletions(-) > > diff --git a/arch/arm/mach-tegra/Kconfig b/arch/arm/mach-tegra/Kconfig > index 373652d..a2c76ee 100644 > --- a/arch/arm/mach-tegra/Kconfig > +++ b/arch/arm/mach-tegra/Kconfig > @@ -10,6 +10,9 @@ config ARCH_TEGRA_2x_SOC > select USB_ARCH_HAS_EHCI if USB_SUPPORT > select USB_ULPI if USB_SUPPORT > select USB_ULPI_VIEWPORT if USB_SUPPORT > + select ARM_ERRATA_742230 > + select PL310_ERRATA_753970 if CACHE_PL310 > + select PL310_ERRATA_769419 if CACHE_L2X0 > help > Support for NVIDIA Tegra AP20 and T20 processors, based on the > ARM CortexA9MP CPU and the ARM PL310 L2 cache controller > @@ -23,6 +26,7 @@ config ARCH_TEGRA_3x_SOC > select USB_ULPI if USB_SUPPORT > select USB_ULPI_VIEWPORT if USB_SUPPORT > select USE_OF > + select PL310_ERRATA_769419 if CACHE_L2X0 > help > Support for NVIDIA Tegra T30 processor family, based on the > ARM CortexA9MP CPU and the ARM PL310 L2 cache controller -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
