Hi Jacky， I think the information of printk has already tell us the reason. 2012/5/29 Jacky lin <h.t.jacky@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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