AM335x - Can you use cache without using MMU?

utelia

Hello,

My questions is in the subject line.

I would like to enable cache in a Bootloader but so far have only managed to do so by using the TI example code which also enables MMU. Does one need the other, or could I enable cache without MMU? The reason for not using MMU is the fact that a 4kB table is needed to initialise it, which I would not like to consume for this.

Please also refer me to any AM335x MMU manual. I haven't found any myself, but my knowledge relates to the few registers documented in the TRM.

Thanks.

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

Hi,

What software are you using?

0 utelia over 8 years ago in reply to Biser Gatchev-XID

Intellectual 290 points

Hi,

I am using a self-written bootloader code which works well both cache enabled and disabled. My only issue is that enabling the MMU takes 4kB of precious memory, so I would like to understand its role in the process and possibly not enable MMU at all, only the cache, if that is possible.

0 Wolfgang Muees1 over 8 years ago in reply to utelia

Genius 3685 points

The information, which area of the memory is cachable, is located in the MMU. So you have to do a minimal setup of the MMU to use the caches.

regards

Wolfgang

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AM335x - Can you use cache without using MMU?