[meta-freescale] i.MX28 bootloader imx-bootlets o u-boot/SPL

[Marco Cavallini]

Hello,
I have a custom i.MX28 board with only USB-OTG to program it.
No SDcard, no USB, nothing.
What is the best practice to prepare a bootloader suitable for
MfgTools (or mxsldr)?
Which recipe or option do I need in my image?
imx-bootlets o u-boot/SPL?

Thanks in advance
--
Marco