debug_optee.txt

U-Boot 2016.03-00227-g503c4c8-dirty (Jun 15 2017 - 16:17:06 +0530)           
                                                                             
CPU:   Freescale i.MX6UL rev1.1 528 MHz (running at 396 MHz)                 
CPU:   Industrial temperature grade (-40C to 105C) at 32C
Reset cause: POR                        
Board: i.MX6UL iW-RAINBOW-G18M-TWR-POS  
Boot Device: MICRO SD                   
I2C:   ready                            
DRAM:  192 MiB
PMIC: PFUZE3000 DEV_ID=0x30 REV_ID=0x11
MMC:   FSL_SDHC: 0
In:    serial
Out:   serial
Err:   serial
switch to partitions #0, OK
mmc0 is current device

Board Info:
        BSP Version     : iW-PRFDV-SC-01-R1.0-REL1.0-Linux4.1.15
        SOM Version     : iW-PREVZ-AP-01-R2.1
        TWR POS Version : iW-PRFDV-AP-01-R1.0
        CPU Unique ID   : 0x1d1261d4e6b61fac 

Net:   PHY indentify @ 0x0 = 0x00221561
PHY indentify @ 0x4 = 0x00221561
FEC [PRIME]
Normal Boot
Hit any key to stop autoboot:  0 

imx6ul_iwg18m_twr_pos> printenv 
baudrate=115200
board_name=TWR POS - i.MX6UL
board_rev=R1.0
boot_fdt=try
bootargs_base=console=ttymxc0,115200n8
bootargs_msd=setenv bootargs ${bootargs_base} root=/dev/mmcblk1p2 rootwait rw
bootcmd=run bootcmd_msd
bootcmd_mfg=run mfgtool_args;bootz ${loadaddr} ${initrd_addr} ${fdt_addr};
bootcmd_msd=run bootargs_msd;mmc dev 0;fatload mmc 0 ${loadaddr} ${kernel};fatload mmc 0 ${fdt_addr} ${fdt_file};bootz ${loadaddr} - ${fdt_addr}
bootdelay=3
bootscript=echo Running bootscript from mmc ...; source
console=ttymxc0
ethact=FEC
ethaddr=CC:AB:CD:DD:AA:BB
ethprime=FEC
fdt_addr=0x83000000
fdt_file=imx6ul-iwg18m-twr-pos.dtb
fdt_high=0xffffffff
findfdt=if test $fdt_file = undefined; then if test $board_name = EVK && test $board_rev = 9X9; then setenv fdt_file imx6ul-9x9-evk.dtb; fi; if test $board_name = EVK && test $board_rev = 14X14; then sete;
image=zImage
initrd_addr=0x83800000
initrd_high=0xffffffff
ip_dyn=yes
ipaddr=192.168.3.29
kernel=zImage
loadaddr=0x80800000
loadbootscript=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${script};
loadfdt=fatload mmc ${mmcdev}:${mmcpart} ${fdt_addr} ${fdt_file}
loadimage=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${image}
mfgtool_args=setenv bootargs console=${console},${baudrate} rdinit=/linuxrc g_mass_storage.stall=0 g_mass_storage.removable=1 g_mass_storage.idVendor=0x066F g_mass_storage.idProduct=0x37FF g_mass_storage. 
mmcargs=setenv bootargs console=${console},${baudrate} root=${mmcroot}
mmcautodetect=yes
mmcboot=echo Booting from mmc ...; run mmcargs; if test ${boot_fdt} = yes || test ${boot_fdt} = try; then if run loadfdt; then bootz ${loadaddr} - ${fdt_addr}; else if test ${boot_fdt} = try; then bootz; ;
mmcdev=0
mmcpart=1
mmcroot=/dev/mmcblk1p2 rootwait rw
netargs=setenv bootargs console=${console},${baudrate} root=/dev/nfs ip=dhcp nfsroot=${serverip}:${nfsroot},v3,tcp
netboot=echo Booting from net ...; run netargs; if test ${ip_dyn} = yes; then setenv get_cmd dhcp; else setenv get_cmd tftp; fi; ${get_cmd} ${image}; if test ${boot_fdt} = yes || test ${boot_fdt} = try; t;
panel=TFT43AB
script=boot.scr
stderr=serial
stdin=serial
stdout=serial

Environment size: 2608/8188 bytes
imx6ul_iwg18m_twr_pos> run bootargs_msd;mmc dev 0;fatload mmc 0 ${loadaddr} ${kernel};fatload mmc 0 ${fdt_addr} ${fdt_file};
switch to partitions #0, OK
mmc0 is current device
reading zImage
6691584 bytes read in 312 ms (20.5 MiB/s)
reading imx6ul-iwg18m-twr-pos.dtb
38569 bytes read in 22 ms (1.7 MiB/s)
imx6ul_iwg18m_twr_pos> fatload mmc 0:1 0x84000000 uTee;
reading uTee
215108 bytes read in 27 ms (7.6 MiB/s)
imx6ul_iwg18m_twr_pos> bootm 0x84000000 - ${fdt_addr};    
Not valid image format for Authentication, Please check

I think you have FIT image boot enabled only, thats why bootm refuses to work on unsigned images.