[U-Boot] Falcon mode boot support

[Andy Pont]

Hello,

I am currently setting up the Falcon mode support for a custom AM3354 based
platform that has U-Boot and the Linux kernel in an SPI NOR flash.

Following the instructions I have loaded the kernel to ${loadaddr} and
device tree to ${fdtaddr} from the SPI flash device and then have run:

U-Boot> spl export fdt ${loadaddr} - ${fdtaddr}

Which seems to have executed correctly as the output ends:

Argument image is now in RAM: 0x8fb3d000

I now need to save this generated data into the SPI ROM but can't figure out
how much I need to write.  Could someone let me know how to work it out?

Thanks,

Andy.