[PATCH v1 3/3] arm: npcm8xx: support dcache off

[Tom Rini]

On Thu, Sep 28, 2023 at 10:32:51PM +0800, Jim Liu wrote:
> Hi  Tom
> 
> Thanks for your understanding.
> but  this patch  is an incomplete patch.
> After I applied this patch  I had another error.
> 
> arch/arm/cpu/armv8/cache_v8.c:773:2: error: #error Please describe
> your MMU layout in CONFIG_SYS_MEM_MAP and enable dcache.
>   773 | #error Please describe your MMU layout in CONFIG_SYS_MEM_MAP
> and enable dcache.
> 
> This error is the same as that link.

Please use that patch as a starting point (and also possibly needing to
grab
https://patchwork.ozlabs.org/project/uboot/patch/20230822075112.717992-2-bhupesh.sharma@linaro.org/
as that's how I'd like to proceed with addressing this generic armv8
issue, thanks!

> 
> Best regards,
> Jim
> 
> On Thu, Sep 28, 2023 at 8:23 PM Tom Rini <trini at konsulko.com> wrote:
> >
> > On Thu, Sep 28, 2023 at 08:49:23AM +0800, Jim Liu wrote:
> > > Hi Tom
> > >
> > > Thanks for the quick review.
> > >
> > > if we set the CONFIG_SYS_DCACHE_OFF the  armv8 will build error.
> > > So we added a workaround for our bmc uboot.
> > >
> > > the error message as below:
> > >
> > > CONFIG_SYS_DCACHE_OFF can't be enabled on armv8, or the following
> > > build error would happen.
> > >
> > > arch/arm/cpu/armv8/cpu.o: in function `cleanup_before_linux':
> > > arch/arm/cpu/armv8/cpu.c:60: undefined reference to `icache_disable'
> > > arch/arm/cpu/armv8/cpu.c:68: undefined reference to `dcache_disable'
> > > arch/arm/cpu/armv8/cpu.c:69: undefined reference to `invalidate_dcache_all'
> >
> > OK, so you need
> > https://patchwork.ozlabs.org/project/uboot/patch/20230811054228.3721455-1-bhupesh.sharma@linaro.org/
> > to be applied, as-is, yes? Thanks!
> >
> > >
> > > Best regards,
> > > Jim
> > >
> > > On Tue, Sep 26, 2023 at 9:48 PM Tom Rini <trini at konsulko.com> wrote:
> > > >
> > > > On Tue, Sep 26, 2023 at 04:56:50PM +0800, Jim Liu wrote:
> > > >
> > > > > do not enable dcache by setting CONFIG_SYS_NPCM_DCACHE_OFF=y
> > > > >
> > > > > Signed-off-by: Jim Liu <JJLIU0 at nuvoton.com>
> > > > > ---
> > > > >  arch/arm/mach-npcm/npcm8xx/Kconfig |  4 ++++
> > > > >  arch/arm/mach-npcm/npcm8xx/cpu.c   | 12 +++++++++++-
> > > > >  2 files changed, 15 insertions(+), 1 deletion(-)
> > > > >
> > > > > diff --git a/arch/arm/mach-npcm/npcm8xx/Kconfig b/arch/arm/mach-npcm/npcm8xx/Kconfig
> > > > > index 5f4a0506dc..163e7e7d48 100644
> > > > > --- a/arch/arm/mach-npcm/npcm8xx/Kconfig
> > > > > +++ b/arch/arm/mach-npcm/npcm8xx/Kconfig
> > > > > @@ -6,6 +6,10 @@ config SYS_CPU
> > > > >  config SYS_SOC
> > > > >       default "npcm8xx"
> > > > >
> > > > > +config SYS_NPCM_DCACHE_OFF
> > > > > +     bool "Do not enable dcache"
> > > > > +     default n
> > > > > +
> > > > >  config TARGET_ARBEL_EVB
> > > > >       bool "Arbel Evaluation Board"
> > > > >       help
> > > >
> > > > Why do we need a new Kconfig option here on top of the existing generic
> > > > ones to control cache?
> > > >
> > > > --
> > > > Tom
> >
> > --
> > Tom

-- 
Tom
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