目前使用了SDK8.6，我用快速指南制作了SD卡，连接好硬件并上电启动时，调试串口打印卡在optee位置了，下面是启动过程：
U-Boot SPL 2021.01-00002-gaafaf646d1-dirty (May 12 2023 - 14:52:43 +0800)
resetting ...
SYSFW ABI: 3.1 (firmware rev 0x0008 '8.6.4--v08.06.04 (Chill Capybar')
SPL initial stack usage: 13432 bytes
Trying to boot from MMC2
Authentication passed
Authentication passed
Authentication passed
Authentication passed
Starting ATF on ARM64 core...
NOTICE: BL31: v2.8(release):v2.8-943-g41914de33
NOTICE: BL31: Built : 14:33:01, May 11 2023
I/TC:
I/TC: OP-TEE version: 3.21.0-68-g23419643e () #1 Thu May 11 08:20:36 UTC 2023 aarch64
I/TC: WARNING: This OP-TEE configuration might be insecure!
I/TC: WARNING: Please check optee.readthedocs.io/.../porting_guidelines.html
I/TC: Primary CPU initializing
I/TC: SYSFW ABI: 3.1 (firmware rev 0x0008 '8.6.4--v08.06.04 (Chill Capybar')
I/TC: HUK Initialized
I/TC: Activated SA2UL device
I/TC: Enabled firewalls for SA2UL TRNG device
I/TC: SA2UL TRNG initialized
I/TC: SA2UL Drivers initialized
I/TC: Primary CPU switching to normal world boot
请问这是什么原因？
