Re: [PATCH] m68k: allow ColdFire m5441x parts to run with MMU enabled

[Angelo Dureghello <angelo@sysam.it>]

Hi Greg,

On 15/07/2017 01:21, Angelo Dureghello wrote:
> Hi Greg,
> 
> The Freescale ColdFire M5441x system-on-chip parts have full paged MMU
> hardware support. So far though we have only allowed them to be
> configured for use in non-MMU mode.
> 
> All required kernel changes to support operation of the M5441x parts
> with MMU enabled have been pushed into the kernel, so now we can allow
> it to be configured and used with the MMU enabled.
> 
> I don't actually have any M5441x based hardware so I can't do any real
> testing on this. The changes up to now were based on Yannick Gicquel
> initial patches to support this. Is anybody out there able to test
> this properly?  I won't push this any further until we have some
> confirmation that it all works as expected.
> 
> Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
> ---
>   arch/m68k/Kconfig.cpu | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/m68k/Kconfig.cpu b/arch/m68k/Kconfig.cpu
> index d2219f30..4dc51c0 100644
> --- a/arch/m68k/Kconfig.cpu
> +++ b/arch/m68k/Kconfig.cpu
> @@ -283,7 +283,7 @@ config M548x
> 
>   config M5441x
>       bool "MCF5441x"
> -    depends on !MMU
> +    select MMU_COLDFIRE if MMU
>       select GENERIC_CLOCKEVENTS
>       select HAVE_CACHE_CB
>       help

forgot some useful info on my test:

- i built a 4.12 kernel from mainline (just pulled git master) and tested
to boot properly as no-mmu

- i have those entries in my defconfig:
....
CONFIG_BINFMT_FLAT=y
CONFIG_BINFMT_ZFLAT=y
CONFIG_BINFMT_SHARED_FLAT=y
CONFIG_BINFMT_MISC=y
....


I can help on debug when back from holidays, in 3 weeks.

Regards,
Angelo Dureghello