topic Re: i.MX6S PMU_REG_CORE reset value in i.MX Processors

i.MX6S PMU_REG_CORE reset value

sugiyamatoshihi — Fri, 20 Dec 2019 07:34:59 GMT

Hi,

I'd like to know about PMU_REG_CORE value.

According to reference manual, its register value is 0x00402010. The value of REG0_TARG is 0x80 means core voltage is 1.1V. It doesn't meet 1.125V at 792MHz min voltage as default. Then I read the register value just after reset, the register value is 0x12 that means 1.150V. It is meet the spec.

Does it means typo of reference manual or boot rom change it?

I checked u-boot, but it changed another value 0x004c0012.

Best Regards,

Sugiyama

Re: i.MX6S PMU_REG_CORE reset value

sugiyamatoshihi — Tue, 24 Dec 2019 00:52:15 GMT

Hi,

I checked the other reference manual of i.MX6 series.

i.MX 6DQP PMU_REG_CORE=0x00482412 REG1 is for VPU/GPU

i.MX 6DQ, 6SDL PMU_REG_CORE=0x00402010 REG1 is for VPU/GPU

i.MX 6SX PMU_REG_CORE=0x00482012 REG1 is for PCIe

I suppose the reset value of PMU_REG_COREis typo, since reference manual of i.MX 6DQ,SDL didn't update.

Is my guess correct?

Best Regards,

Sugiyama

Re: i.MX6S PMU_REG_CORE reset value

igorpadykov — Tue, 24 Dec 2019 04:55:11 GMT

Hi Sugiyama

yes your guess is correct, this is typo in reference manual.

Best regards
igor
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Re: i.MX6S PMU_REG_CORE reset value

sugiyamatoshihi — Tue, 24 Dec 2019 05:45:57 GMT

Hi, Igor,

Thank you for your answer.

I understood default value PMU_REG_CORE=0x00482412 for i.MX6DQ and SDL was correct.

Best Regards

Sugiyama