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How to tweak PCIE signal using IOMUXC_GPR8 register ?

Question asked by Peter Amond on Oct 31, 2018
Latest reply on Nov 1, 2018 by igorpadykov

Hi All,


My custom hardware is based on iMX6Q processor and design most similar to nitrogen6_max and I'm using nitogen6_max uboot and dtbs.


Attached document says the parameters of PCIe_PHY can be adjusted by changing the IOMUXC_GPR8 register settings to get the test passed.



1) Where can I find above 0x20e0020 register in uboot ? Do I need to add that line to uboot ?


2) What values should I change to tweak PCIE signal ? When I go through nitrogen6_max uboot I can see following lines in two files. So what values should I change to tweak PCIE signal ?


File path >> arch/arm/include/asm/arch-mx6/iomux.h




File path >> drivers/pci/pcie_imx.c




3) Can you give me an example how to tweak PCIE signals using GPR8 register ?