cache policy of arm mmu

[Cunsuo Guo]

Hi Jacky，
I think the information of printk has already tell us the reason.

2012/5/29 Jacky lin <h.t.jacky at gmail.com>:
> Hi all,
>
> I found that the cache policy in after ARMv6 is always set as writeback mode
> in mmu.c.
>
> static int __init early_cachepolicy(char *p)
> {
>    ...
>     if (cpu_architecture() >= CPU_ARCH_ARMv6) {
>         printk(KERN_WARNING "Only cachepolicy=writeback supported on ARMv6
> and later\n");
>         cachepolicy = CPOLICY_WRITEBACK;
>     }
>    ...
> }
>
> Does anyone know why and provide some documents or links for that?
>
> Thanks so much!
>
> Cheers,
> Jacky
>
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