When flush all dcache, why the increasing step is 2?

On Fri, Oct 12, 2012 at 11:51:07AM +0100, Li Haifeng wrote:

For flush all data cache, the flush action begins from Level 0, then increase
cache level by 1.

But in function v7_flush_dcache_all, the step is 2. IOW, it will just flush
0,2,4,6 level cache.
As the following code, the step is stored in r10, and the increase line is "add
    r10, r10, #2".

That's because the cache level is written in the CSSELR bits 3:1 (so no
bit 0). When the levels of cache is calculated (r3), it is also 2x.

-- 
Catalin