First I am fairly new to U-Boot but over the last 2 weeks I have been going through the README files and anything else I can find that would help resolve the issue I have. Here is a recap:
Currently the project I am working on was setup with U-Boot 2009-11-01 and works just fine with one exception. I was asked to find a solution where our field support engineers could recover if a firmware update failed causing our board to no longer boot. Basically it cycles through RomBOOT and U-Boot. As I looked through the environment variables and commands I came across the USB subsystem and found I could use fatload. With our system there are three files I need to load from USB, these are uImage, etc.jff2 and rootfs.ext2.gz.uboot.
I found if I used tftp these files transferred correctly and the board would boot with the new files. I thought the solution was found and I could simply setup the same files using USB through environment variables. The script worked but the problem was when it tried to load rootfs into RAM it would cause a CPU reset and RomBOOT to start. At first I thought there was something wrong with the script so I tried to load the file by typing it the command but got the same result.
Command:
usb start
fatload usb 0 $(loadaddr) rootfs.ext2.gz.uboot where loadaddr is the same address used by tftp.
My first question is, is there a solution for this issue using U-Boot 2009.11.1? This version builds currently within our project.
Second question is I downloaded U-Boot 2013.07 but noticed huge change in the build process. I figured out the patches I need along with the AT91 configuration for our board. We are using the arm926ej6 processor with a board similar to at91sam9260ek. When I try to build I get the hardware.h:49:3 error: #error "Unsupported AT91 processor" message. When I look at the header file I see where it fails but I don't understand why since I do have a matching define. For some reason hardware.h is not seeing this define and I am stumped as to why. So any suggestions on how to solve or figure this out would be appreciated.
Thanks!
Chuck