Re: [ECOS] App works in RAM but not in flash memory

[Jonathan Larmour <jlarmour at redhat dot com>]

Daniel.Andersson@combitechsystems.com wrote:
> 
> Hi,
> 
> I have some problem with my messages (cyg_mbox_*) in eCos and hope that some
> of you maybe can give me a hint of what maight be wrong. Currently I am
> running the entire application in RAM and it works fine. However, when i
> download the program it into flash then it starts acting very strange. With
> a trace enabled i can see that some (not all...) messages that are sent
> between threads dont have any valid data in their header. Every message
> contains of a header and the data that it contains is just garbage. The
> first thing i check was that if some process sends an unfilled message but
> that was not the case.
> 
> What can be wrong when an application works fine in RAM but not in flash? I
> have tried to set the clock to half the speed to give the flash more time to
> fetch data but the error was still present.
> 
> I am using a custom build AT91EB40 with external flash.

Seems odd certainly. I can't imagine a situation where it would mostly but
not completely work, in that way. If you had a support contract I could
look more closely by trying it myself, but otherwise I don't have the time,
sorry.

Which situation are you talking about: is it built for "ROM" startup type
and is running direct from Flash? Or is it built for RAM startup, and being
loaded into RAM from flash using "fis load"?

Jifl
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