[U-Boot] WARNING: Caches not enabled on openrd based board

[U-Boot] WARNING: Caches not enabled on openrd based board

[Alex Zeffertt]

Hi U-Booters,

I get the following warning when I boot our openrd based board:

> U-Boot 2012.07 (Aug 17 2012 - 10:45:29)
> OpenRD-Base
>
> SoC:   Kirkwood 88F6281_A1
> DRAM:  128 MiB
> WARNING: Caches not enabled
> NAND:  512 MiB

I am running the latest code from git with a small number of changes
to make it work with our hardware.
(In particular we have had to rewrite board/Marvell/openrd/kwbimage.cfg.)

My question is: does the warning about caches affect only U-Boot (in
which case I don't mind) or will it also affect Linux?

TIA,

Alex

[U-Boot] WARNING: Caches not enabled on openrd based board

[Lukasz Majewski]

On Fri, 17 Aug 2012 12:16:56 +0100
Alex Zeffertt <azeffertt@cambridgesys.com> wrote:

> Hi U-Booters,
> 
> I get the following warning when I boot our openrd based board:
> 
> > U-Boot 2012.07 (Aug 17 2012 - 10:45:29)
> > OpenRD-Base
> >
> > SoC:   Kirkwood 88F6281_A1
> > DRAM:  128 MiB
> > WARNING: Caches not enabled
> > NAND:  512 MiB
> 
> I am running the latest code from git with a small number of changes
> to make it work with our hardware.
> (In particular we have had to rewrite
> board/Marvell/openrd/kwbimage.cfg.)
> 
> My question is: does the warning about caches affect only U-Boot (in
> which case I don't mind) or will it also affect Linux?

As fair as I know, it will only affect u-boot. If I remember correctly,
caches are disabled (and fulshed) just before passing execution to
linux.

Those caches are disabled, since some time ago it turns out, that many
drivers had problems with unaligned buffers allocation.  

> 
> TIA,
> 
> Alex
> _______________________________________________
> U-Boot mailing list
> U-Boot at lists.denx.de
> http://lists.denx.de/mailman/listinfo/u-boot



-- 
Best regards,

Lukasz Majewski

Samsung Poland R&D Center | Linux Platform Group

[U-Boot] WARNING: Caches not enabled on openrd based board

[Alex Zeffertt]

On Aug 17, 2012 4:26 PM, "Lukasz Majewski" <l.majewski@samsung.com> wrote:
>
> On Fri, 17 Aug 2012 12:16:56 +0100
> Alex Zeffertt <azeffertt@cambridgesys.com> wrote:
>
> > Hi U-Booters,
> >
> > I get the following warning when I boot our openrd based board:
> >
> > > U-Boot 2012.07 (Aug 17 2012 - 10:45:29)
> > > OpenRD-Base
> > >
> > > SoC:   Kirkwood 88F6281_A1
> > > DRAM:  128 MiB
> > > WARNING: Caches not enabled
> > > NAND:  512 MiB
> >
> > I am running the latest code from git with a small number of changes
> > to make it work with our hardware.
> > (In particular we have had to rewrite
> > board/Marvell/openrd/kwbimage.cfg.)
> >
> > My question is: does the warning about caches affect only U-Boot (in
> > which case I don't mind) or will it also affect Linux?
>
> As fair as I know, it will only affect u-boot. If I remember correctly,
> caches are disabled (and fulshed) just before passing execution to
> linux.
>
> Those caches are disabled, since some time ago it turns out, that many
> drivers had problems with unaligned buffers allocation.
>

Ah yes. I remember hitting that problem myself with the openrd board gig
eth driver. And that does appear to have been resolved as you say.

Thanks for the explanation.

Alex
> >
> > TIA,
> >
> > Alex
> > _______________________________________________
> > U-Boot mailing list
> > U-Boot at lists.denx.de
> > http://lists.denx.de/mailman/listinfo/u-boot
>
>
>
> --
> Best regards,
>
> Lukasz Majewski
>
> Samsung Poland R&D Center | Linux Platform Group

[U-Boot] WARNING: Caches not enabled on openrd based board

[Stefan Herbrechtsmeier]

Am 17.08.2012 13:16, schrieb Alex Zeffertt:
> I get the following warning when I boot our openrd based board:
>
>> U-Boot 2012.07 (Aug 17 2012 - 10:45:29)
>> OpenRD-Base
>>
>> SoC:   Kirkwood 88F6281_A1
>> DRAM:  128 MiB
>> WARNING: Caches not enabled
>> NAND:  512 MiB
The warning tells you that the plaform has no implementation of function 
enable_caches.

At the moment the l2cache and icache is enabled in function arch_misc_init.

[U-Boot] WARNING: Caches not enabled on openrd based board

[Prafulla Wadaskar]

> -----Original Message-----
> From: u-boot-bounces at lists.denx.de [mailto:u-boot-
> bounces at lists.denx.de] On Behalf Of Alex Zeffertt
> Sent: 17 August 2012 16:47
> To: u-boot at lists.denx.de
> Subject: [U-Boot] WARNING: Caches not enabled on openrd based board
> 
> Hi U-Booters,
> 
> I get the following warning when I boot our openrd based board:
> 
> > U-Boot 2012.07 (Aug 17 2012 - 10:45:29)
> > OpenRD-Base
> >
> > SoC:   Kirkwood 88F6281_A1
> > DRAM:  128 MiB
> > WARNING: Caches not enabled
> > NAND:  512 MiB
> 
> I am running the latest code from git with a small number of changes
> to make it work with our hardware.
> (In particular we have had to rewrite
> board/Marvell/openrd/kwbimage.cfg.)
> 
> My question is: does the warning about caches affect only U-Boot (in
> which case I don't mind) or will it also affect Linux?

At least for Kirkwood, cache is forced disabled to keep peripheral drives small and simple.
I don't think it affects Linux.

Regards...
Prafulla . . .