i.MX6UL GPIO Pad Configuration & OpenOCD Signal Issues

dev_imx — Tue, 13 Dec 2022 00:51:39 GMT

I am attempting to use an IMX6UL as a JTAG interface utilizing OpenOCD's native bitbang support for the IMX's GPIO.

I have successfully connected to the target at lower speeds such as 100KHz. However, to successfully perform flash functions, I need to set the adapter to speed to at least 500KHz, preferably closer to 1500KHz, and have not yet been able to connect to the target at these higher speeds. I have tried a host of GPIO Pad Control Configurations to optimize the signal output but have yet to find one that can properly handle these high speeds.

Therefore, I have the following two questions:

What is the best possible GPIO pad configuration to reach these high speeds?
Is it possible to toggle the GPIO registers using the IMX6UL at these higher speeds(500KHz,1500KHz,etc)?

Re: i.MX6UL GPIO Pad Configuration & OpenOCD Signal Issues

jimmychan — Mon, 19 Dec 2022 08:01:53 GMT

Which pad are you using?

For example: You could check the pad control setting in the RM.

IOMUXC_SW_PAD_CTL_PAD_GPIO1_IO00

You could try to set the speed and the SRE of the PAD.

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i.MX6UL GPIO Pad Configuration & OpenOCD Signal Issues

Re: i.MX6UL GPIO Pad Configuration & OpenOCD Signal Issues