[PATCH] ARM pbl: Make usage of MMU in pbl optional
Jean-Christophe PLAGNIOL-VILLARD
plagnioj at jcrosoft.com
Wed Oct 3 11:21:53 EDT 2012
On 16:12 Wed 03 Oct , Sascha Hauer wrote:
> On Wed, Oct 03, 2012 at 02:34:35PM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > On 14:30 Wed 03 Oct , Sascha Hauer wrote:
> > > On Wed, Oct 03, 2012 at 01:35:50PM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > > > On 12:24 Wed 03 Oct , Sascha Hauer wrote:
> > > > > Since this currently does not work on all boards make usage
> > > > > of the MMU in the pbl optional until this has been resolved.
> > > > >
> > > > > Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
> > > > > ---
> > > > > arch/arm/cpu/start-pbl.c | 2 +-
> > > > > common/Kconfig | 5 +++++
> > > > > 2 files changed, 6 insertions(+), 1 deletion(-)
> > > > >
> > > > > diff --git a/arch/arm/cpu/start-pbl.c b/arch/arm/cpu/start-pbl.c
> > > > > index 932a3da..ceb60ab 100644
> > > > > --- a/arch/arm/cpu/start-pbl.c
> > > > > +++ b/arch/arm/cpu/start-pbl.c
> > > > > @@ -116,7 +116,7 @@ static void mmu_disable(void)
> > > > > static void barebox_uncompress(void *compressed_start, unsigned int len)
> > > > > {
> > > > > void (*barebox)(void);
> > > > > - int use_mmu = IS_ENABLED(CONFIG_MMU);
> > > > > + int use_mmu = IS_ENABLED(CONFIG_PBL_USE_MMU);
> > > > >
> > > > > /* set 128 KiB at the end of the MALLOC_BASE for early malloc */
> > > > > free_mem_ptr = MALLOC_BASE + MALLOC_SIZE - SZ_128K;
> > > > > diff --git a/common/Kconfig b/common/Kconfig
> > > > > index b97392c..7e4cf1f 100644
> > > > > --- a/common/Kconfig
> > > > > +++ b/common/Kconfig
> > > > > @@ -139,6 +139,11 @@ config IMAGE_COMPRESSION_GZIP
> > > > >
> > > > > endchoice
> > > > >
> > > > > +config PBL_USE_MMU
> > > > > + bool "Use MMU in PBL image"
> > > > default y if MMU
> > >
> > > Can do, but can you then send a patch for the defconfigs which don't
> > > work with MMU in the pbl?
> >
> > ok give one day to test all
>
> Another plan. Since remap_cache currently does not work and
> I'm not confident enough to apply the fixups so close before
> a release we can equally well disable the feature for now.
>
> Ok?
just for the record I work on ux5x0 for ST-E /ST Soc where you must enable
the l2x0 to use the mmu
And I get the same issue on nomadik that was alo on fo the reason I want to
add the initcall to the pbl to have SoC and board init
Best Regards,
J.
>
> Sascha
>
> 8<------------------------------------------------------
>
> From c05511d6cdbcddf32d41d4036e49af8a9c18832d Mon Sep 17 00:00:00 2001
> From: Sascha Hauer <s.hauer at pengutronix.de>
> Date: Wed, 3 Oct 2012 12:23:41 +0200
> Subject: [PATCH] ARM: Disable MMU feature in PBL
>
> remap_cache currently does not work, so enabling the MMU in the
> PBL currently does not make sense. Disable it for now.
>
> Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
> ---
> arch/arm/cpu/start-pbl.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/cpu/start-pbl.c b/arch/arm/cpu/start-pbl.c
> index 932a3da..3bd520c 100644
> --- a/arch/arm/cpu/start-pbl.c
> +++ b/arch/arm/cpu/start-pbl.c
> @@ -116,7 +116,11 @@ static void mmu_disable(void)
> static void barebox_uncompress(void *compressed_start, unsigned int len)
> {
> void (*barebox)(void);
> - int use_mmu = IS_ENABLED(CONFIG_MMU);
> + /*
> + * remap_cached currently does not work rendering the feature
> + * of enabling the MMU in the PBL useless. disable for now.
> + */
> + int use_mmu = 0;
>
> /* set 128 KiB at the end of the MALLOC_BASE for early malloc */
> free_mem_ptr = MALLOC_BASE + MALLOC_SIZE - SZ_128K;
> --
> 1.7.10.4
>
> --
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