Hi,
On Wed Sep 24, 2014 at 21:01:06 +0200, ba_f wrote:
i'm quite new to embedded, so i need some fundamental help.
I have an App, that naturally runs on Linux. Now, i want to run it as a raw L4-Task (BareMetal), and no L4Linux.
The problem is, the App requires non-volatile storage. Naturally, it would be started in a terminal; before starting, one has to set the Variable where to store data.
Example:
export STORE_PATH=/home/appData/ ./startApp
(The app then gets the path like this: char *path = getenv("STORE_PATH"); Anyway...)
So, there are two questions for me:
1.) How do i allocate a filesystem to the flash? 2.) How do i set the variable STORE_PATH ?
Is such an App possible without L4Linux?
It is possible. But of course there needs to be a driver for your flash and a filesystem (if needed). And there's none. There's a tmpfs, i.e. a filesystem that can store files, however, not across reboots. Maybe that helps you already?
Setting environment variables is as easy as putting them as a third parameter to the start function: ...start({ ... }, "rom/startApp", { STORE_PATH="/home/appData/" })
Adam