I'm creating a bare metal program on Cortex-A7,Then, a bit 30 of MPIDR, that is 'U', is '0'.
Could anybody tell me how to make the bit be '1'?
Thank you.
On most systems, only the primary core boots. So if you do not start the other cores (the "how" depends on your SoC) you running single-core.
I'm reading "Individual processor shutdown mode" in DDI0464F_cortex_a7_mpcore_r0p5_trm.pdf.
How about shutting down power to three cores except for one?
Does it make a sense?
2U3
You can't.
"The MPIDR characteristics are:Purpose Provides an additional processor identification mechanism for scheduling purposes in a multiprocessor system.Usage constraints The MPIDR is:• A read-only register."
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