IMX93-A55 and M33 started at the same time M core cannot control the GPIO

[ChumingYang]

A core SDK version ：6.1.55

M core SDK version：2.14

The first test：using flash.bin（make by make SOC=iMX9 flash_singleboot_m33） to start both A and M cores，then M core cannot control the GPIO（Test using M-core GPIO routine），However, other peripherals such as the SPI IIC work properly

The secord：using flash.bin（make by make SOC=iMX9 flash_singleboot） to start A cores，start M kernel using elf link file，then The M core can control GPIO normally

The third：In the uboot phase, load the firmware for gpio control (.bin format) to m33 and run m33 to control gpio normally

The above test methods are based on IMX93-EVK test，Do you have the general idea and solution of the positioning problem? Thank you

#IMX9352

[Zhiming_Liu]

The first test：using flash.bin（make by make SOC=iMX9 flash_singleboot_m33） to start both A and M cores，then M core cannot control the GPIO（Test using M-core GPIO routine），However, other peripherals such as the SPI IIC work properly

--> The difference between test1 and test2&3 is that, test1 will load M33 firmware before loading A55 firmware. Please check your M-core GPIO routine rules, the current M-core GPIO routine you use may need load A55 firmware before M33 core.

[ChumingYang]

I've confirmed your point by adding a 5 second delay to the M-core GPIO routine（before RGPIO_PININIT）

By reading the RM， I suspect that GPIO control in the M core is required after the initialization of the ATF security module in the A core is complete，Is this correct? If yes, what can be judged by ATF module initialization success

[Zhiming_Liu · Accepted solution]

Hi @ChumingYang 

You are correct.

If yes, what can be judged by ATF module initialization success

-->You can try to read GPIO_BASE + 0x10/0x14/0x18/0x1c status.

[ChumingYang]

Thank you very much. I will continue to test in this direction. In addition, I am also very interested in the following questions

https://community.nxp.com/t5/i-MX-Processors/How-to-extend-the-buffer-size-of-A55-in-iMX9352-when-us...