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DRA821U: Power on test, our customer board can not boot to uboot randomly

Part Number: DRA821U
Other Parts Discussed in Thread: DRA821

dear expert, 

we are perform the power on test with our customer board.  on the customer board, we put uboot to EMMC user area,  and put linux rootfs to EMMC user area. the reproduce step is :

power on the board,  wait 10 seconds,  poweroff the board, then power on the board. 

we abserved the board can not boot to uboot randomly. below is the uart output:

LOG1:

U-Boot SPL 2021.01 (Jan 13 2022 - 09:33:14 +0800)
Model: Texas Instruments K3 J7200 SoC
Board: J7200X-PM1-SOM rev E2
SYSFW ABI: 3.1 (firmware rev 0x0015 '21.5.0--v2021.05 (Terrific Llam')
ti_power_domain_probe(dev=41c85db8)
Trying to boot from MMC1
init_env from device 17 not supported!
Starting ATF on ARM64 core...

NOTICE:  BL31: v2.4(release):v2.4-467-g2e0e51f42-dirty
NOTICE:  BL31: Built : 21:34:55, Mar 23 2021

U-Boot SPL 2021.01 (Jan 13 2022 - 09:32:56 +0800)
Model: Texas Instruments K3 J7200 SoC
Board: J7200X-PM1-SOM rev E2
SYSFW ABI: 3.1 (firmware rev 0x0015 '21.5.0--v2021.05 (Terrific Llam')
### ERROR ### Please RESET the board ###

LOG2:

U-Boot SPL 2021.01 (Jan 13 2022 - 09:33:14 +0800)
Model: Texas Instruments K3 J7200 SoC
Board: J7200X-PM1-SOM rev E2
SYSFW ABI: 3.1 (firmware rev 0x0015 '21.5.0--v2021.05 (Terrific Llam')
ti_power_domain_probe(dev=41c85db8)
Trying to boot from MMC1
init_env from device 17 not supported!
Starting ATF on ARM64 core...

NOTICE:  BL31: v2.4(release):v2.4-467-g2e0e51f42-dirty
NOTICE:  BL31: Built : 21:34:55, Mar 23 2021

U-Boot SPL 2021.01 (Jan 13 2022 - 09:32:56 +0800)
Model: Texas Instruments K3 J7200 SoC
Board: J7200X-PM1-SOM rev E2
SYSFW ABI: 3.1 (firmware rev 0x0015 '21.5.0--v2021.05 (Terrific Llam')
Trying to boot from MMC1


U-Boot 2021.01 (Jan 13 2022 - 09:32:56 +0800)

SoC:   J7200 SR1.0
Model: Texas Instruments K3 J7200 SoC
Board: J7200X-PM1-SOM rev E2
DRAM:  4 GiB
ti_sci dmsc@44083000: ti_sci_of_to_info: Acquiring Tx channel failed. ret = -19
ti_sci dmsc@44083000: ti_sci_probe: Probe failed with error -19
ti_sci dmsc@44083000: ti_sci_of_to_info: Acquiring Tx channel failed. ret = -19
ti_sci dmsc@44083000: ti_sci_probe: Probe failed with error -19
ti_sci dmsc@44083000: ti_sci_of_to_info: Acquiring Tx channel failed. ret = -19
ti_sci dmsc@44083000: ti_sci_probe: Probe failed with error -19
ti_sci dmsc@44083000: ti_sci_of_to_info: Acquiring Tx channel failed. ret = -19
ti_sci dmsc@44083000: ti_sci_probe: Probe failed with error -19
ti_sci dmsc@44083000: ti_sci_of_to_info: Acquiring Tx channel failed. ret = -19
ti_sci dmsc@44083000: ti_sci_probe: Probe failed with error -19
ti_sci dmsc@44083000: ti_sci_of_to_info: Acquiring Tx channel failed. ret = -19
ti_sci dmsc@44083000: ti_sci_probe: Probe failed with error -19
ti_sci dmsc@44083000: ti_sci_of_to_info: Acquiring Tx channel failed. ret = -19
ti_sci dmsc@44083000: ti_sci_probe: Probe failed with error -19
ti_sci dmsc@44083000: ti_sci_of_to_info: Acquiring Tx channel failed. ret = -19
ti_sci dmsc@44083000: ti_sci_probe: Probe failed with error -19
No serial driver found
resetting ...
ti_sci dmsc@44083000: ti_sci_of_to_info: Acquiring Tx channel failed. ret = -19
ti_sci dmsc@44083000: ti_sci_probe: Probe failed with error -19
ti_sci dmsc@44083000: ti_sci_of_to_info: Acquiring Tx channel failed. ret = -19
ti_sci dmsc@44083000: ti_sci_probe: Probe failed with error -19
ti_sci dmsc@44083000: ti_sci_of_to_info: Acquiring Tx channel failed. ret = -19
ti_sci dmsc@44083000: ti_sci_probe: Probe failed with error -19
System reset not supported on this platform
### ERROR ### Please RESET the board ###