[U-Boot] [PATCH 2/2] ARM: Add workaround for Cortex-A9 errata 761320
Nitin Garg
nitin.garg at freescale.com
Wed Apr 2 14:44:58 CEST 2014
Hi Dirk,
There is no revision and variant in this cpu_init_cp15 function. I think this function is common unlike kernel code which was cortex specific.
Regards,
Nitin Garg
-----Original Message-----
From: Dirk Behme [mailto:dirk.behme at de.bosch.com]
Sent: Wednesday, April 02, 2014 1:46 AM
To: Garg Nitin-B37173
Cc: trini at ti.com; Estevam Fabio-R49496; u-boot at lists.denx.de
Subject: Re: [U-Boot] [PATCH 2/2] ARM: Add workaround for Cortex-A9 errata 761320
On 02.04.2014 05:33, nitin.garg at freescale.com wrote:
> From: Nitin Garg <nitin.garg at freescale.com>
>
> Full cache line writes to the same memory region from at least two
> processors might deadlock the processor. Exists on r1, r2, r3
> revisions.
>
> Signed-off-by: Nitin Garg <nitin.garg at freescale.com>
> ---
> README | 1 +
> arch/arm/cpu/armv7/start.S | 5 +++++
> 2 files changed, 6 insertions(+), 0 deletions(-)
>
> diff --git a/README b/README
> index a496c65..b7c0f68 100644
> --- a/README
> +++ b/README
> @@ -567,6 +567,7 @@ The following options need to be configured:
> CONFIG_ARM_ERRATA_743622
> CONFIG_ARM_ERRATA_751472
> CONFIG_ARM_ERRATA_794072
> + CONFIG_ARM_ERRATA_761320
>
> If set, the workarounds for these ARM errata are applied early
> during U-Boot startup. Note that these options force the diff
> --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S index
> b87a378..1229476 100644
> --- a/arch/arm/cpu/armv7/start.S
> +++ b/arch/arm/cpu/armv7/start.S
> @@ -227,6 +227,11 @@ ENTRY(cpu_init_cp15)
> orr r0, r0, #1 << 4 @ set bit #4
> mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
> #endif
> +#ifdef CONFIG_ARM_ERRATA_761320
> + mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
> + orr r0, r0, #1 << 21 @ set bit #21
> + mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
> +#endif
Is there any reason why you dropped the check for r4p0
cmp r6, #0x40 @ present prior to r4p0
which you still had in
http://www.spinics.net/lists/arm-kernel/msg319223.html
?
Best regards
Dirk
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