I wrote minirootfs as usual directly to usb flash drive
minirootfs61.fs 31-Jul-2017 03:11 22020096
U-Boot> boot
Card did not respond to voltage select!
mmc_init: -95, time 24
USB device 0:
Device 0: Vendor: Kingston Rev: 1.00 Prod: DataTraveler 2.0
Type: Removable Hard Disk
Capacity: 14762.4 MB = 14.4 GB (30233588 x 512)
... is now current device
Scanning usb 0:1...
Found EFI removable media binary efi/boot/bootaa64.efi
reading efi/boot/bootaa64.efi
75732 bytes read in 75 ms (985.4 KiB/s)
## Starting EFI application at 01000000 ...
Card did not respond to voltage select!
mmc_init: -95, time 24
Found 0 disks
BS->LocateHandle() returns 0
"Synchronous Abort" handler, esr 0x02000000
ELR: 39b3ecfc
LR: 39b421ec
x0 : 0000000000000000 x1 : 000000003afec000
x2 : 0000000000000002 x3 : 000000000000003f
x4 : 0000000000000010 x5 : 0000000000000000
x6 : 000000003af96558 x7 : 0000000039b3efa8
x8 : 0000000039b4c8ac x9 : 0000000039b3e39c
x10: 000000003ab4fa70 x11: 000000003ab4faf0
x12: 000000003ab4fbc0 x13: 0000000039b4d850
x14: 000000003ab4fd6c x15: 00000000ffffffff
x16: 0000000000004110 x17: ad7bd9a555f85ec4
x18: 0000000000000000 x19: 0000000039b4db12
x20: 0000000039b4c920 x21: 0000000000000001
x22: 0000000039a3d030 x23: 0000000039b4cb00
x24: 0000000039b4c920 x25: 0000000000000200
x26: 000000003afa76b0 x27: 0000000039b3e148
x28: 0000000000000000 x29: 000000003ab4fcd0
Resetting CPU ...
resetting ...
