On Mon, Dec 15, 2014 at 04:20:46PM -0000, Andy Pont wrote:

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?

So first, take a look at drivers/mtd/spi/spi_spl_load.c as that's what will be doing falcon mode work on your SPI flash.

Second, take a look at board/ti/am335x/README, you're looking for the lines that read like: Using Device Tree in place at 80f80000, end 80f85928

Which means the size is 0x5928.