[U-Boot] [PATCH 1/3] ARM: i.MX6: exclude the ARM errata from i.MX6 UP system

[Peng Fan]

> -----Original Message-----
> From: Stefano Babic [mailto:sbabic at denx.de]
> Sent: Tuesday, August 08, 2017 4:50 PM
> To: Peng Fan <peng.fan at nxp.com>; sbabic at denx.de
> Cc: van.freenix at gmail.com; u-boot at lists.denx.de; Fabio Estevam
> <fabio.estevam at nxp.com>
> Subject: Re: [PATCH 1/3] ARM: i.MX6: exclude the ARM errata from i.MX6 UP
> system
> 
> Hi Peng,
> 
> On 08/08/2017 07:34, Peng Fan wrote:
> > The ARM errata 751472, 794072, 761320 only applied to the following
> > configuration:
> >
> > This erratum affects configurations with either:
> > - One processor if the ACP is present
> > - Two or more processors
> >
> 
> Apart that I agree that such as work-around should be applied just to the
> affected SOCs, which is the issues to apply them to the whole MX6 family ?
> 
> For example, 751472 requires to set CP15 bit 11 with a specific sequence. Right,
> single core MX6 do not need it, but even if this is set in this way, is there a side-
> effect ? Just curious...

I have no idea about there is side effect if applying them to single core mx6.
But we better apply them only affected SoCs.

Regards,
Peng.
> 
> > i.MX6 family does not have the ACP and thus only the MPCore system
> > will be impacted, which are the i.MX6DQ, i.MX6DL, and i.MX6QP.
> >
> > Signed-off-by: Peng Fan <peng.fan at nxp.com>
> > Cc: Stefano Babic <sbabic at denx.de>
> > Cc: Fabio Estevam <fabio.estevam at nxp.com>
> > ---
> >  arch/arm/mach-imx/mx6/Kconfig | 15 +++++++++++----
> >  1 file changed, 11 insertions(+), 4 deletions(-)
> >
> > diff --git a/arch/arm/mach-imx/mx6/Kconfig
> > b/arch/arm/mach-imx/mx6/Kconfig index bb2ce33..2be67e1 100644
> > --- a/arch/arm/mach-imx/mx6/Kconfig
> > +++ b/arch/arm/mach-imx/mx6/Kconfig
> > @@ -1,24 +1,31 @@
> >  if ARCH_MX6
> >
> > +config MX6_SMP
> > +	select ARM_ERRATA_751472
> > +	select ARM_ERRATA_761320
> > +	select ARM_ERRATA_794072
> > +	bool
> > +
> >  config MX6
> > +	select ARM_ERRATA_743622 if !MX6UL
> >  	bool
> >  	default y
> > -	select ARM_ERRATA_743622 if !MX6UL
> > -	select ARM_ERRATA_751472 if !MX6UL
> > -	select ARM_ERRATA_761320 if !MX6UL
> > -	select ARM_ERRATA_794072 if !MX6UL
> >  	imply CMD_FUSE
> >
> >  config MX6D
> > +	select MX6_SMP
> >  	bool
> >
> >  config MX6DL
> > +	select MX6_SMP
> >  	bool
> >
> >  config MX6Q
> > +	select MX6_SMP
> >  	bool
> >
> >  config MX6QDL
> > +	select MX6_SMP
> >  	bool
> >
> >  config MX6S
> >
> 
> Best regards,
> Stefano
> 
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