[U-Boot] [SPL mode] Question

[Lukasz Majewski]

Hi Stefano,

I've got some questions about Falcon mode and spl export command.

I've looked into the ./common/cmd_spl.c at master branch
SHA1: 59852d03867108217fe88e3bfc3e1e9cedfe63c5

Correct me if I'm wrong (or I've overlooked something). 
It looks that, this file version is a very early version. 

After reading "Falcon" mode README - I'd expect, that "spl export" will
write either ATAGS or FDT to NAND (or any other memory).
For this file it doesn't do that. Am I missing some additional patches?

Since you stated, that Falcon mode is only (now) supported on NAND
memory, I'd like to ask if it is acceptable to extend cmd_spl.c to
write ATAGS/FDT image to eMMC or (better) to partition formatted as EXT4
of FAT?

I can imagine a following scenario:

1. Use u-boot to generate ATAGS (from bootcmd args defined for board
or cmd line parameters) or FDT blob with "spl export". Store it on a
partition or eMMC.

2. Use SPL (second stage bootloader) to parse this blob, place ATAGS or
FDT accordingly, read uImage and pass execution to it.

What is your opinion?


-- 
Best regards,

Lukasz Majewski

Samsung Poland R&D Center | Linux Platform Group