L2 Cache enable on i.MX5

[Robert Daniels]

> I'm working on an mx53, too (tqma53 board), but with an 4.1 kernel.
> How can I check whether L2 cache is enabled ?

I discovered our problem by comparing the version of Das U-Boot we are using
with the latest from Freescale's repository. In this comparison, I discovered that
there had been a patch introduced to enable the L2 cache.  The L2 cache enable
patch is also in the mainline U-Boot source too so if you check in this file:
arch/arm/cpu/armv7/mx5/lowlevel_init.S
around line 49 you should see a comment about enabling the L2 cache. If it's there
you're good to go.

> Can you estimate, how much performance gain we can actually get from the
> L2 cache (under which kind of workloads) ?

In our testing we are seeing a 1.5x - 2.0x improvement. Of course, this may not
affect you at all - we just got unlucky and get our bootloader at the wrong time.

- Robert

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