Disabling caches on P4080DS: Hypervisor mode

rahul011189 — Thu, 17 Mar 2016 06:55:09 GMT

Hi there,

I am working with the P4080DS board, QorIQ-SDK V1.8. I would like to know how can I disable caches (all levels i.e. L1, L2, L3), while working with the Hypervisor mode.

(Note: I have already tried to modify the uBoot code to disable the caches. But the hypervisor fails to boot up with the modified uBoot)

As per my understanding, in Hypervisor mode, most cache related registers should be readable by the guest Linux. However, I am getting error while trying to read those registers from guest Linux. It will be really helpful if I can get an early response.

Thanks,

Rahul

Re: Disabling caches on P4080DS: Hypervisor mode

bpe — Fri, 18 Mar 2016 08:06:33 GMT

There is no way to disable caches globally under Hypervisor.

Hypervisor itself requires caches to be turned on when it starts:

https://freescale.sdlproducts.com/LiveContent/content/en-US/QorIQ_SDK_1.9/GUID-7D7609D0-4C06-4E07-A42A-09550C2AA446

And the guest cannot turn off caches:

https://freescale.sdlproducts.com/LiveContent/content/en-US/QorIQ_SDK_1.9/GUID-FD1ECD38-06AB-44A0-9FA9-7BCDC0F98443

Have a great day,
Platon

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Disabling caches on P4080DS: Hypervisor mode

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