i.MX8M Nano - Default A53 Console Debug UART

[arnemaathuis]

Hello,

In some i.MX8m Nano HW documents the A53 debug uart or console is placed on UART2

1st Question: just some curiosity as an HW guy, is this fixed in HW or can i select for instance UART3 by changing some settings in uboot or elsewhere.

2nd Question:

In our application the dedicated UART2 pins (E15/F15) are placed in a very cramped space layout wise, i intend to use the alternative UART2 pins on SAI3 (AC6/AG6), if i select these in uboot (or select the IOMUX elsewhere) for UART2, can i use AC6/AG6 as A53 debug console?

regards

[arnemaathuis]

Thank you once again, diving deeper into Linux/uboot details is on my todo list :smileyhappy:

regards Arne Maathuis

[igorpadykov · Accepted solution]

Hi Arne

1. it is defined in uboot imx8mn_evk.h :  #define CONFIG_MXC_UART_BASE

imx8mn_evk.h\configs\include - uboot-imx - i.MX U-Boot 

2.> if i select these in uboot (or select the IOMUX elsewhere) for UART2,

>can i use AC6/AG6 as A53 debug console?

yes. May be useful Chapter 3 Porting U-Boot i.MX_Porting_Guide.pdf

included in Linux 5.4.3_1.0.0 Documentation

Best regards
igor
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