topic Re: Disabling cache using VLE in MPC5xxx

Disabling cache using VLE

stefanodimasci1 — Tue, 09 Feb 2016 16:20:33 GMT

Hello everybody,

is it possible to disable the i-cache on the e200z4 usign VLE?

Thank you

Re: Disabling cache using VLE

davidtosenovjan — Tue, 09 Feb 2016 16:32:48 GMT

Yes, it is possible. It does not matter whether BookE or VLE mode is being used. Cache memory can be disabled/enabled in both cases.

Re: Disabling cache using VLE

stefanodimasci1 — Tue, 09 Feb 2016 17:07:24 GMT

Thank you, but the following inline code

asm("mtspr L1CSR1, %r31");

produce the following error:

Error: unsupported relocation against L1CSR1

and at this point I don't understand why

Re: Disabling cache using VLE

EAlepins — Tue, 09 Feb 2016 17:52:02 GMT

Is L1CSR1 defined? (i.e. ".equ") Otherwise, it will be considered as a symbol name and will produce the relocation error you mentioned. So, if L1CSR1 is not natively supported in your compiler, then add the following:

.equ L1CSR1 1011

to declare the SPR number matching L1CSR1.