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ARMv7 "write buffer" issue

Zhanguo Li
Note: This was originally posted on 3rd July 2012 at http://forums.arm.com

Hi All,

I have a question about the "write buffer" for ARMv7 processor.

Write buffer is explicitly described in TRM(tech reference manual) prior to ARMv6. E.g, how to enable/disable it, how to configure it in a MMU page table descriptor etc.

However, it looks to me that write buffer is not explicitly described in TRM of ARMv7. So I have some questsions below. Could someone confirm if my understanding is correct.

For ARMv7 processor:

1. Write buffer is only used by "Normal" memory , "strongly-ordered" and "device" memory have nothing do do with it. Is this correct?
2. For the normal memory, despite the cacheability configuration, write buffer will always be used? Is this correct?

Thanks in advance.
-Jerry
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