(gdb) target remote localhost:3333

Remote debugging using localhost:3333
hang () at /media/cyhn/riscv-yocto-scratch/build/workspace/sources/u-boot-vfs/lib/hang.c:33
33		for (;;)

(gdb) where

#0  hang () at /media/cyhn/riscv-yocto-scratch/build/workspace/sources/u-boot-vfs/lib/hang.c:33

#1  0x00000000800004d4 in do_reset (cmdtp=cmdtp@entry=0x0 <current_mallinfo>, flag=flag@entry=0, argc=argc@entry=0, argv=argv@entry=0x0 <current_mallinfo>)
    at /media/cyhn/riscv-yocto-scratch/build/workspace/sources/u-boot-vfs/arch/riscv/lib/reset.c:15

#2  0x00000000800027dc in panic_finish () at /media/cyhn/riscv-yocto-scratch/build/workspace/sources/u-boot-vfs/lib/panic.c:30

#3  0x00000000800027f0 in panic_str (str=str@entry=0x80004c98 "No serial driver found") at /media/cyhn/riscv-yocto-scratch/build/workspace/sources/u-boot-vfs/lib/panic.c:39

#4  0x00000000800042a0 in serial_find_console_or_panic () at /media/cyhn/riscv-yocto-scratch/build/workspace/sources/u-boot-vfs/drivers/serial/serial-uclass.c:152

#5  0x0000000080004358 in serial_init () at /media/cyhn/riscv-yocto-scratch/build/workspace/sources/u-boot-vfs/drivers/serial/serial-uclass.c:161

#6  0x00000000800008fc in preloader_console_init () at /media/cyhn/riscv-yocto-scratch/build/workspace/sources/u-boot-vfs/common/spl/spl.c:927

#7  0x00000000800004fc in board_init_f (dummy=<optimized out>) at /media/cyhn/riscv-yocto-scratch/build/workspace/sources/u-boot-vfs/arch/riscv/lib/spl.c:33

#8  0x0000000080000098 in wait_for_gd_init () at /media/cyhn/riscv-yocto-scratch/build/workspace/sources/u-boot-vfs/arch/riscv/cpu/start.S:226