How to know working cpus on imx8

mrigendra_chaub — Mon, 10 Jun 2019 13:26:45 GMT

Hi All,

I have a imx8qm based board and I want to know cpus on it, as it have a cortex a53 and cortex a72 cpus
We have this api

static inline unsigned int read_midr(void)
{
unsigned long val;
asm volatile("mrs %0, midr_el1" : "=r" (val));
return val;
}
#define is_cortex_a35() (((read_midr() & MIDR_PARTNUM_MASK) >> MIDR_PARTNUM_SHIFT) == MIDR_PARTNUM_CORTEX_A35)
#define is_cortex_a53() (((read_midr() & MIDR_PARTNUM_MASK) >> MIDR_PARTNUM_SHIFT) == MIDR_PARTNUM_CORTEX_A53)
#define is_cortex_a72() (((read_midr() & MIDR_PARTNUM_MASK) >> MIDR_PARTNUM_SHIFT) == MIDR_PARTNUM_CORTEX_A72)

The problem here is if I use

is_cortex_a72()

I get return as 1, but if I use

is_cortex_a53()

I get 0.

Does that mean there is no a53 cpu or we need to modify something here?

Re: How to know working cpus on imx8

CarlosCasillas — Wed, 12 Jun 2019 23:06:16 GMT

Hi,

The i.MX8QM is still on preproduction, so, no additional information/support could be provided yet. In case of having doubts, please refer with your Sales/FAE.

Hope this will be useful for you. Best regards! /Carlos

Hope this will be useful for you.
Best regards!
/Carlos
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topic Re: How to know working cpus on imx8 in i.MX Processors

How to know working cpus on imx8

Re: How to know working cpus on imx8