Reduce Frequency of IMX93 by accesing resistors from userspace

dhruvinrajpura — Thu, 06 Jun 2024 11:59:59 GMT

I am using IMX93 EVK where I required to reduce cpu frequency of A core which is currently 1600MHz.

I want to reduce it up to 200MHz,

Earlier for IMX8ULP EVK I followed below method and I was able to control frequency on A core with accessing appropriate resisters

# Switch a35 to FRO 192 MHz
/unit_tests/memtool -32 0x292c0014=0x08000000

# Set PLLEN to 0
/unit_tests/memtool -32 0x292c0500=0x03000000

# Read and set the division and multiplication factors
/unit_tests/memtool -32 0x292c0014 1
/unit_tests/memtool -32 0x292c0510 1


# Set PLLEN to 1"
/unit_tests/memtool -32 0x292c0500=0x03000001

# Switch a35 to PLL2"
/unit_tests/memtool -32 0x292c0014=0x18000000

mhz

I checked reference manual of IMX93, but I am not able to get resistor by which I can control clock,

Can anyone guide me on this?

Re: Reduce Frequency of IMX93 by accesing resistors from userspace

JosephAtNXP — Thu, 06 Jun 2024 23:22:31 GMT

Hi,

Thank you for your interest in NXP Semiconductor products,

CPU Frequency is changed between Low Power Modes (ND, OD, etc.). Please refer to this post.

Regards

MCX MicrocontrollersのトピックReduce Frequency of IMX93 by accesing resistors from userspace

Reduce Frequency of IMX93 by accesing resistors from userspace

Re: Reduce Frequency of IMX93 by accesing resistors from userspace