Can I route my UART to shared IO when using Early I/O release on Arria 10 SoC?

Description

Due to a problem in the SoC EDS software version 15.1 and later, routing your Arria® 10 HPS UART to Shared I/O can cause u-boot to halt if if Early I/O is enabled.

Resolution

To work around this problem in the SoC EDS software version 16.0 and earlier follow the steps below:

1. Open uboot-socfpga/arch/arm/cpu/armv7/socfpga_arria10/cff.c and remove / comment out all printf/puts
2. Rebuild u-boot-socfpga: make clean;make

This problem is scheduled to be fixed in a future release of the SoC EDS software.

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