Hello World UART output garbled on Alveo U25

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#67 opened on Aug 20, 2025 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 25/100

Issue type: Bug
Clarity: Needs clarification
Activity status: Stale
Tech stack: linux
Domain: embedded-iot

Research direction

Start by checking the UART configuration used by the Vitis Hello World application and the PetaLinux deployment, including the selected baud rate. The issue is resolved when the application output is readable on the Alveo U25 over UART.

Written by the indexing model from the issue text.

Description

Following the Zynq UltraScale+ MPSoC Embedded Design Tutorial, I built and deployed the Hello World application on the Alveo U25. The board boots via JTAG, and the application builds successfully in Vitis, but when running it, the UART output appears completely garbled despite trying different baud rates. Any idea how to see the output ? The same issue happens with PetaLinux.

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Merged PRs (30d): 1

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