[Skyeye-developer] switch off MMU on ARM920 or ARM926

[Michael.Kang]

On Jan 30, 2008 8:59 AM, sergey bryukov <sb.subscribe at gmail.com> wrote:
> As I understand, there is core hierarchy chart in ARM family like below:
>
> |- ARMv5TE
> |                  |- ARM9E-S
> |                                  |-ARM966E-S
>  |
> |- ARMv5TEJ
> |                 |-  ARM9EJ-S
> |                                     |- ARM926EJ-S
> |
> |
> |- ARMv4T
> |              |- ARM9TDMI
> |                                   |- ARM920T
>
>  Two processors of them are presented in the Skyeye -  ARM926EJ-S and
> ARM920T.
> ARM926EJ-S is the most  closed to ARM966E-S. And I don't know what means
> '-S' in architecture name.
>
> comparison table:
>
> ARM966E-S
> ARM926EJ-S
> ARM9E-S integer core                                               ARM9EJ-S
> integer core
> simple fixed memory map                                          MMU
>
> features for efficient execution of Java byte codes
>
> Harvard cached architecture  4KB or 128KB
>
>
> 1. If weren't use Java support  functionality  of  926EJ-S, instruction set
> of both CPU should be the same.
>
> 2. For   926EJ-S  the caches, Tightly-Coupled Memories (TCMs), Memory
> Management Unit (MMU), and most other system options are controlled using
> CP15 registers. It should be possible switch off all of them and get 966E-S
> in general.
>
> Does it look like true?
maybe, I have not read these manual in every detail.
>
> In the Skyeye's sources there is ns9750_mach_init() - it presents ARM926EJS
> based CPU.
> To initialize arm emulator ARMul_SelectProcessor (state, ARM_v5_Prop |
> ARM_v5e_Prop) function should be invoked for ARM926EJS.
>  Does the same parameters should be used in case of any ARMv5E core based
> target?
>
> Could you refer me how-to add new arm core to the skyeye?
According to my understanding, you should add a MMU implementation in
arch/arm/common/mmu/ , just like other core. Then add some entry in
arch/arm/common/armmmu.c . Anyway, you can try it firstly.
>
> Thanks,
> Sergey.
>
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> > On Jan 29, 2008 4:33 PM, Michael. Kang <blackfin.kang at gmail.com> wrote:
> >
> > > Yes,You can  run some nommu applications or RTOS with MMU off. But I
> > > donot know if ARM920T with MMU off has same behaviour with ATM966E.
> > > Except MMU , is there any other difference between ARM966E and
> > > ARM920T??
> > >
> > > Thanks
> > > MK
> > >
> > >
> > >
> > > On 1/29/08, sergey bryukov <sb.subscribe at gmail.com> wrote:
> > > > Hello Kang!!!
> > > > I've been spending some time to add new SOC to skyeye and I found
> skyeye is
> > > > grate for quick SoC design .
> > > > Thanks to project attenders!!!!
> > > >
> > > > Is it possible to switch off MMU during ARM920 emulation  by
> configuration
> > > > register CP15  to present cores like ARM966E?
> > > >  In another words, is it possible invoke ARM9 not MMU  RTOS enviroment
> under
> > > > Skyeye?
> > > >
> > > > Thanks.
> > > >
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> > > >
> > >
> > >
> > > --
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> > >
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>
>
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