Environment variables value table:
#
# BOARDID BOARDSKU FAB BOARDREV
# ----------------------------------+--------+---------+----+---------
# jetson-agx-xavier-industrial 2888 0008 600 A.0
# clara-agx-xavier-devkit 3900 0000 001 C.0
# jetson-xavier-nx-devkit 3668 0000 100 N/A
# jetson-xavier-nx-devkit-emmc 3668 0001 100 N/A
# jetson-xavier-nx-devkit-emmc 3668 0003 N/A N/A
# jetson-agx-xavier-devkit (16GB) 2888 0001 400 H.0
# jetson-agx-xavier-devkit (32GB) 2888 0004 400 K.0
# jetson-agx-orin-devkit 3701 0001 TS1 C.2
# jetson-agx-orin-devkit 3701 0000 TS4 A.0
# jetson-agx-xavier-devkit (64GB) 2888 0005 402 B.0
# holoscan-devkit 3701 0002 TS1 A.0
# jetson-agx-orin-devkit 3701 0004 TS4 A.0
# jetson-agx-orin-devkit (64GB) 3701 0005 500
# jetson-orin-nano-devkit (NX 16GB) 3767 0000 300
# jetson-orin-nano-devkit (NX 8GB) 3767 0001 300
# jetson-orin-nano-devkit (Nano 4GB) 3767 0004 300
# jetson-orin-nano-devkit (Nano 8GB) 3767 0003 300
# jetson-orin-nano-devkit (Nano 8GB) 3767 0005 300
# ----------------------------------+--------+---------+----+---------
Do it like
sudo BOARDID=xxx BOARDSKU=yyy FAB=zzz ./tools/kernel_flash/l4t_initrd_flash.sh …