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PROCESSOR-SDK-AM335X: U-boot warning

Part Number: PROCESSOR-SDK-AM335X

I'm using beaglebone black and booting SD card.

when booting kernel, ** Unrecognized filesystem type ** message was appears.

but kernel image are successfully booted.

why this messages was printed ?

what configuration is required to remove warning message ?

U-Boot 2019.01-gf95c3e0297-dirty (Oct 21 2019 - 09:20:21 +0900)

CPU  : AM335X-GP rev 2.1
Model: TI AM335x BeagleBone Black
DRAM:  512 MiB
NAND:  0 MiB
MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
Loading Environment from FAT... OK
Net:   eth0: ethernet@4a100000
Warning: usb_ether MAC addresses don't match:
Address in ROM is          de:ad:be:ef:00:01
Address in environment is  f4:e1:1e:ce:d7:49
, eth1: usb_ether
Hit any key to stop autoboot:  0
switch to partitions #0, OK
mmc1(part 0) is current device
SD/MMC found on device 1
** Unrecognized filesystem type **
** Unrecognized filesystem type **
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1...
switch to partitions #0, OK
mmc0 is current device
SD/MMC found on device 0
4080128 bytes read in 265 ms (14.7 MiB/s)
36717 bytes read in 4 ms (8.8 MiB/s)
## Flattened Device Tree blob at 88000000
   Booting using the fdt blob at 0x88000000
   Loading Device Tree to 8fff4000, end 8fffff6c ... OK

Starting kernel ...