ERIKA Enterprise Forums

Hello all,
I have this board at home http://www.freescale.com/webapp/sps/sit ... e=IMX53QSB.
I want to port ERIKA RTOS onto this for self-learning and if successful contribute back to this community.

Though I went through a couple of your wikis, none seem to clarify what exactly the steps needed to accomplish what i have in mind. This is what i want

* At the end, there should be a simple imx53qsbErika.ELF RTOS image/file, which can be uploaded to target and run, using uboot already running in target , through a serial cable. A simple LED on/off application(ELF file nostdlib/static) that uses this OS layer. Alternatively both OS + APP as a single ELF also fine.

* Since i am fimiliar with embedded linux/kernel building/usage in various targets, I expect a similar simple build environment using some compiler/toolchains that can be downloaded for _free_ from the net ( GCC is preferrable ). The OS should be configurable ( e.g mono stack..etc.,.) from the command line and just built. Is OIL necessary ?

* I have a virtualized windows/ubuntu host/dev m/c, no problem. What other TOOLS needed, other than ERIKA downloads.

* JTAG/GDB-like debugger support? though _not_ needed immediately. I can live with debug log messages for the time being.

I have downloaded ERIKA and I could see the ..../druid/eclipse/plugins/com.eu.evidence.ee_2.4.0.20141105_0021 folder.

What next? Can somebody help

Thanks
Alex

Replying to myself :
an UPDATE --
Following your wikis on "...getting started....build...first application.." I am able to build a project based on the STM32F4 template, by pointing the GCC compiler path to = "where i HAD downloaded Linaro...gcc-arm-none-eabi-4_7-2013q1.."

....[snip]....
Build success saying
ibee.a
LD
OBJCOPY
************************************
Compilation terminated successfully!

20:38:17 Build Finished (took 5s.392ms)

May be someone can take it from here and explain what to do next. I already have some boot-code ready for this board, based on uboot startup code. I just need to know, where to plugin this code, which linker scripts to modify, and build an OS elf file from command line.
Thanks Alex

Hi!

Thanks for your post!

Where to start...

- is OIL really needed? ... really good question. In reality, yes. Why? Because ERIKA was meant initially to be minimal, with everything possible allocated in Flash. A minimal build of erika on a small machine can be less than 1Kb and a few bytes of RAM. OIL is one of the ways devised by the Automotive guys to create a static configuration. Basically, OIL creates a pre-initialized kernel data structure for you. There is not an equivalent of pthread_create, everything exists since the beginning.

- I know the previous point is quite strange for a Linux developer, but that is. In reality we could write a simple kernel which does NOT need the OIL file. Soon or later (I always say since a few years) I'll build the Shark kernel over the ERIKA HAL (it does not need OIL)... but sincerely my daughter is taking all my free time for now

- About Cortex A: We are going to release (hopefully by Christmas if Bruno has some free time) the development environment Arianna Avanzini presented at Cloudcon (http://lccoelce14.sched.org/speaker/ariava#.VIQAoDGG-zk). Basically it is ERIKA on a Cortex A15 as a domU in XEN. Look also at the SVN, it has a CPU which is Cortex A.

- also look at the pre-built virtual machines on http://www.erika-enterprise.com

- note eclipse and the packages are there because:
- the OIL compiler (RT-Druid) is based on eclipse
- we packaged ERIKA as an Eclipse plugin to help users upgrading the system
- the Cortex-M virtual machine should be configured to use a repository in the user home and not the pre-packaged plugins

- Then look at the following pages
http://erika.tuxfamily.org/wiki/index.p ... controller

which should give some help for portings.

I guess that's all for a first mail... Welcome!

Ciao,

PJ