cache policy of arm mmu

[Jacky lin <h.t.jacky@xxxxxxxxx>]

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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