$ sudo imx_usb u-boot.imx
config file </etc/imx-loader.d/imx_usb.conf>
vid=0x066f pid=0x3780 file_name=mx23_usb_work.conf
vid=0x15a2 pid=0x004f file_name=mx28_usb_work.conf
vid=0x15a2 pid=0x0052 file_name=mx50_usb_work.conf
vid=0x15a2 pid=0x0054 file_name=mx6_usb_work.conf
vid=0x15a2 pid=0x0061 file_name=mx6_usb_work.conf
vid=0x15a2 pid=0x0063 file_name=mx6_usb_work.conf
vid=0x15a2 pid=0x0041 file_name=mx51_usb_work.conf
vid=0x15a2 pid=0x004e file_name=mx53_usb_work.conf
vid=0x15a2 pid=0x006a file_name=vybrid_usb_work.conf
vid=0x066f pid=0x37ff file_name=linux_gadget.conf
config file </etc/imx-loader.d/mx6_usb_work.conf>
parse /etc/imx-loader.d/mx6_usb_work.conf
15a2:0054(mx6_qsb) bConfigurationValue =1
Interface 0 claimed
HAB security state: development mode (0x56787856)
== work item
filename u-boot.imx
load_size 0 bytes
load_addr 0x00000000
dcd 1
clear_dcd 0
plug 1
jump_mode 2
jump_addr 0x00000000
== end work item
main dcd length 310
sub dcd length 30c

loading binary file(u-boot.imx) to 7ffff400, skip=0, fsize=4bc00 type=aa

<<<310272, 310272 bytes>>>
succeeded (status 0x88888888)
jumping to 0x7ffff400