i.MX ProcessorsのトピックRe: i.MX6SDL PMU_MISC2n reset value

i.MX6SDL PMU_MISC2n reset value

sugiyamatoshihi — Thu, 26 Dec 2019 05:57:11 GMT

Hi,

I'd like to know the reset value of REG # _ STEP_TIME in PMU_MISC2n.

It seems the value is all 11b just after reset when we read by debugger, but reference manual showed 00b.

Also it told 00b in A7 of https://community.nxp.com/message/880009 .

What is correct?

Best Regards,

Sugiyama

Re: i.MX6SDL PMU_MISC2n reset value

weidong_sun — Thu, 02 Jan 2020 03:35:42 GMT

Hello Toshishisa,

The reset value of the register in reference manual is the value before ROM code. Therefore, the register value you see in debugger is the value after ROM code runs. Therefore, it is normal that the register value obtained by deugger is different from the reset value.

If you have any problems, you can reconfigure the register to the value you need in u-boot or kernel.

Have a nice day!

BR,

Weidong

Re: i.MX6SDL PMU_MISC2n reset value

sugiyamatoshihi — Mon, 06 Jan 2020 01:03:13 GMT

Hi, Weidong,

Thank you for your answer.

I understood we couldn't catch exact register value at the moment of reset.

I just curious that I couldn't see any code to manipulate that registers in disassembled ROM code by debugger after reset. Do you think it was debugger matter or I just couldn't fined the ROM code? I couldn't check it because we don't have ROM source code.

Best Regards,

Sugiyama

Re: i.MX6SDL PMU_MISC2n reset value

weidong_sun — Mon, 06 Jan 2020 03:53:03 GMT

Hello Toshishisa,

ROM code is the internal microcode of CPU. We do not release its source code. If you have any problems, you can reconfigure the value of those registers in u-boot or kernel. Therefore, you don't have to worry about the values of those registers after ROM code runs.

Have a nice day!

BR,

Weidong

Re: i.MX6SDL PMU_MISC2n reset value

sugiyamatoshihi — Thu, 16 Jan 2020 08:23:57 GMT

Hi, Weidong,

Thank you for the answer.

Customer understood it.

Best Regards,

Sugiyama