root@am437x-evm:/# [18297.761272] usb 1-1: new high-speed USB device number 9 using xhci-hcd
[18297.903143] usb 1-1: New USB device found, idVendor=090c, idProduct=1000
[18297.909912] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[18297.917147] usb 1-1: Product: USB DISK
[18297.920932] usb 1-1: Manufacturer: SMI Corporation
[18297.931494] usb 1-1: ep 0x81 - rounding interval to 128 microframes, ep desc says 255 microframes
[18297.940459] usb 1-1: ep 0x2 - rounding interval to 128 microframes, ep desc says 255 microframes
[18297.958416] usb-storage 1-1:1.0: USB Mass Storage device detected

root@am437x-evm:/var/log# fdisk -l

Disk /dev/mmcblk0: 7.4 GiB, 7948206080 bytes, 15523840 [19081.613660] end_request: I/O error, dev mtdblock0, sector 0
[19081.620915] Buffer I/O error on device mtdblock0, logical block 0
sectors
Units: sectors of 1 * 512 = 512 bytes
Se[19081.629109] end_request: I/O error, dev mtdblock0, sector 0
[19081.638347] Buffer I/O error on device mtdblock0, logical block 0
ctor size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x00000000

Device         Boot     Start       End  Blocks  Id System
/dev/mmcblk0p1 *           63    144584   72261   c W95 FAT32 (LBA)
/dev/mmcblk0p2         160650   4980149 2409750  83 Linux
/dev/mmcblk0p3        4980150  15518789 5269320  83 Linux

fdisk: cannot open /dev/mtdblock0: Input/output error
root@am437x-evm:/var/log# mount -t /dev/mmcblk0p1 /home/root/usb_mmc_mnt/
mount: can't find /home/root/usb_mmc_mnt/ in /etc/fstab
root@am437x-evm:/var/log# mount -t vfat /dev/mmcblk0p1 /home/root/usb_mmc_mnt/                                                                 
mount: mounting /dev/mmcblk0p1 on /home/root/usb_mmc_mnt/ failed: Device or resource busy
root@am437x-evm:/var/log# cd /home/root/usb_mmc_mnt/
root@am437x-evm:~/usb_mmc_mnt# ls