|Targeted Hardware||phyBOARD-Zeta (i.MX7)|
The serial console is essential for communication with and development of your design. This how-to guide will demonstrate the steps required to change the default serial debug console configuration.
Specifically, the phyBOARD-Zeta uses UART5 as the default serial console. This requires a breakout cable assembly to expose the RS-232 pins that are available on a pin header on the Zeta board, a null modem cable, and finally an RS-232 cable to the host. The PEB-EVAL-02 board exposes UART1 via the RS-232 protocol on a DB9 connector. This will be the target configuration that the how-to guide will demonstrate.
<Picture of phyBOARD-Zeta with UART5 and UART1 marked>
To change the serial console for u-boot, you'll need to modify the CONFIG_CONS_INDEX and CONFIG_MXC_UART_BASE definitions in the u-boot source.
Change CONFIG_CONS_INDEX to indicate the index of the UART that is desired. In this case, we will change it from 5 to 1:
Change CONFIG_MXC_UART_BASE to indicate the UART base address of the UART that is desired. In this case, we will change it from 5 to 1:
Verify the desired UART pins are muxed correctly in u-boot:
Change the SERIAL_CONSOLE to indicate the desired 'ttymxc' device in the imx7d_phyboard_zeta_001 machine configuraiton. In this case, we will change it from a 4 to a 0:
You'll also want to verify the desired UART pins are muxed in your device tree:
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