rpi3: cannot load bl2 firmware with "TRUSTED_BOARD_BOOT" enabled

[heldermath]

When try to use armstub8.bin on raspberry pi 3 b, this error occurs:

NOTICE: Booting Trusted Firmware
NOTICE: BL1: v2.11.0(debug):v2.11.0-dirty
NOTICE: BL1: Built : 11:51:22, May 23 2024
INFO: BL1: RAM 0x100ee000 - 0x100f9000
INFO: BL1: cortex_a53: CPU workaround for erratum 843419 was applied
INFO: BL1: cortex_a53: CPU workaround for erratum 855873 was applied
INFO: BL1: cortex_a53: CPU workaround for erratum 1530924 was applied
INFO: Using crypto library 'mbed TLS'
NOTICE: rpi3: Detected: Raspberry Pi 3 Model B (1GB, Sony, UK) [0x00a02082]
INFO: BL1: Loading BL2
INFO: Loading image id=6 at address 0x100b4000
INFO: Image id=6 loaded: 0x100b4000 - 0x100b44be
ERROR: Failed to load BL2 firmware.