Why does U-boot SPL get stuck when warm reset triggered continuously?

Description

Due to a problem in the U-boot SPL version 2020.10 and earlier, when warm reset is triggered continuously, U-boot SPL might be stuck at the below message:

U-Boot SPL 2020.10 (Jul 01 2021 - 14:23:45 +0800)
Reset state: Warm (Triggered by Watchdog 0)
MPU         1000000 kHz
L3 main     400000 kHz
Main VCO    2000000 kHz
Per VCO     2000000 kHz
EOSC1       25000 kHz
HPS MMC     50000 kHz
UART        100000 kHz
DDR: 4096 MiB

This problem only happens after triggering thousands of warm resets and sometimes it would not happen at all.

Resolution

There is no fix for this problem right now.