Hi, I have tested it on my machine.
Using commit deb3b13759fe08 , I can successfully boot into nsh. For your reference, the following are my environments. Build machine: - Windows10 WSL2 18.04 - gcc (Ubuntu 9.3.0-11ubuntu0~18.04.1) 9.3.0 Execute machine: - Ubuntu 18.04 - Xeon 2650 v4 / 16GB - Custom compiled kernel: - Linux rtlab-linux 5.4.39-rt23+ #1 SMP PREEMPT_RT Mon May 11 22:10:55 JST 2020 x86_64 x86_64 x86_64 GNU/Linux - Custom compiled Qemu: - QEMU emulator version 4.2.0 (v4.2.0-dirty) BR, -- Yang Chung Fan (楊宗凡) (ヤン ゾン ファン)