Hi,
Ohh, of course - that's the way I'll do it. That is, saving it in an environment-variable. In order to change it from Linux, access to the NOR-flash is required, right?! I'm not quite sure I have that?
Of course yoiu have - through the MTD layer (and the stuff in the tools/env directory).
Ok, then I'm sure my board's kernel dosn't detect the NOR. The only mtd-messages I get concerns the NAND.
Dooh! I forgot that tftp use UDP. Then "responding" means one correct response from the tftp-server within x seconds. I guess there is a
Define "correct" response. What about time outs later?
That would be ok. What I want is u-boot to try to see if there is a tftp-server connected (meaning that someone is trying to upgrade the firmware). If not: continue rapidly into Linux and launch the application. I don't wanna spend too much time hanging in u-boot if the reboot were, say, due to a powerfailure.
Hence, what I want is perhaps (?) environment variables controlling how how many retries, the interval between each "T"-try, and the amount of tries before abondoning...
Perhaps.
:-) I know that is exactly what I'm looking for...
Hence, what I'd like, was a way to determine if the download was successfull - e.g. by comparing the return value for the command.
You can do that easily - just not by timeout only.
How?
Use the return code in some conditional, like an "if tftp ... ; then ... ; fi" or some "tftp ... && ..." - whatever you use in other shell scripts, too.
Is there a document describing these scripting possibilities?
man sh? Ok, ok, the hush shell does not provide every bell and whistle the bash has, but it's a pretty complete thing. See the busybox docs for more information.
Ahaaaaa!!! There we have it! If one does not know the name of it - one (me) will look under "5.11. U-Boot Scripting Capabilities" (which is empty).
and not in the correct (faq-) section: "14.2.10. How the Command Line Parsing Works"
That title is not intuitive to me. I read: "How the 'Old, simple command line parser' works".
IMHO that beautiful section shouldn't be in a FAQ... :o)
Now, I just need to recompile with the enabling parameter (CFG_HUSH_PARSER).
BR, Martin