Software upgrade using U-boot

Hi All,

I have a linux 2.6 kernel running on ARM9 based target. i have a U-Boot as boot loader. I need to do a software upgrade.I am explaining my approach :-

My system is having a well defined GUI with touch screen on it.So when running linux application with GUI and touchscreen
user can send a command that he wants to upgrade the software ( include kernel + root file system + application) via touchscreen GUI.
As far as my understanding goes i think application need to write something on flash( let us say change flag=1) so that next time when system reboots it U-boot read the variable status from same flash location so that it should not boot from flash and use tftfp downlaod and when download gets completed it changes the status of variable in order to make u-boot loading image from flash for next time onwards.

Is it possible to do the software upgrade like the way i have explained , if not pls suggest a better way of doing it using U-boot.But my only requirement is, i dont want to go to U-boot command prompt and do the upgrades manually. I need some kind of automatic approach which basically start when my application is running.

Thanks
KVM
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Hello,

Please mind the Netiquette and restrict your line leght to some 70 characters or so.

This is one of the many ways to do this..

There are many, many ways to do suftware updates, and U-Boot supports many of them. Of course, a lot of stuff can also be done under Linux.

It is impossible to give good recommendations without knowing your exact project requirements. Here a few questions you should contemplate about:

- Is it allowed to run the update under U-Boot (when the normal function of your device is not available), r do you need more or less uninterruptd operation, so you must at least perform the installation of the new code under Linux?
- How important is an (automatic?) fall back for you, i. e. how are you goingt to handle the situations when a software update gets interrupted or fails or if it completed but the new installed software fails to run correctly for some reason?
- Do you always require network access for updates? How about other installation methods, like using a USB memory stick?
etc.

Please mind the netiquette and NEVER quote completely unrelated stuff here.

Also, never top post / full quote.

Please read http://www.netmeister.org/news/learn2quote.html

And never, never ever again post HTML here!

Wolfgang Denk

DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: [email protected]
 The software required `Windows 95 or better', so I installed Linux.