[U-Boot] Uboot can't load kernel.. Bad data CRC

[Riccardo Giuliacci]

Hello, i'm using an UDOO board (based on Freescale i.mx6) that loads
keernel from SD card. I have used debootstrap method to install Debian
armel image to sd card. Following the guide on eLinux, i have to download
uImage from sources and copy it to /boot SD partition. But when i boot, i
get "bad data CRC" error.. Why? Kernel load entry point is 10008000, uboot
loadaddr is 0x12000000
Please help me to boot my UDOO!!! Thanks