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PROCESSOR-SDK-AM64X: emmc cannot boot with fat mode

Artur Toews
Prodigy 170 points

Part Number: PROCESSOR-SDK-AM64X

Hello,

I'm trying to boot from emmc.

When following the instructions from the Manual (booting from emmc) it boots, when the sd card is still plugged.
After unplugging the sd card the boot fails:

U-Boot 2021.01-g53e79d0e89 (Aug 10 2021 - 21:47:02 +0000)

SoC:   AM64X SR1.0
Model: Texas Instruments AM642 EVM
Board: AM64-GPEVM rev E2
DRAM:  2 GiB
MMC:   mmc@fa10000: 0, mmc@fa00000: 1
In:    serial@2800000
Out:   serial@2800000
Err:   serial@2800000
Net:   eth0: ethernet@8000000
Hit any key to stop autoboot:  0
MMC: no card present
SD/MMC found on device 1
MMC: no card present

I can modify the u-boot env mmcdev=0 and bootpart=0 to get the target booted. But I cannot save the env.
There seem to be a workaround for that in another thread:
u-boot changes to save environment values to root fs in emmc

So far so good.
But now I follow the simple approach to flash the mmc image into the emmc: (xzcat *wic.xz | dd of=/dev/mmcblk0 bs=1M).
That means: SPL and u-boot are located in a fatfs instead of boot-partition of the emmc.
But unfortunally the board is not booting:

U-Boot SPL 2021.01-g53e79d0e89 (Jul 21 2021 - 18:14:50 +0000)
SYSFW ABI: 3.1 (firmware rev 0x0015 '21.5.0--v2021.05 (Terrific Llam')
SPL initial stack usage: 13392 bytes
Trying to boot from MMC1
init_env from device 9 not supported!
Starting ATF on ARM64 core...

Isn't it possible to boot from emmc in fat mode?