Info regarding development activity in RTEMS for ARM bsps/Raspberry pi

Wed Aug 20 15:46:40 UTC 2014

Hi Alan,

Thanks for the information. Besides my below queries, could you please also
let me know from where I should begin with ?

Like first I was thinking of understanding at least the initialization
routine from the starting point of raspberry pi. Starting with the
stack/vector initialization and ending up to driver and filesystem(in
brief)... Would be good if there any documentation which I can directly
refer to apart from code.

On Wed, Aug 20, 2014 at 7:07 PM, Alan Cudmore <alan.cudmore at gmail.com>
wrote:

> Hi Ritesh,
> For the Raspberry Pi, Andre Marques added GPIO, SPI, and I2C support for
> his Google Summer of Code project. When this code is merged, it will allow
> many other devices to work on the Pi. There is still
>

Ok, I will try to go through this once.

> plenty of other work to do on the Raspberry Pi BSP including:
> - JTAG debugging - I have not had the time to continue my work with the
> MiniMod/OpenOCD JTAG debugger. It currently does not work reliably for me.
> Another user is using a second Raspberry Pi as a JTAG interface.
>

Any link to that information of using other pi board as JTAG interface ?

> - SD card driver - Some work has been done by Andre towards this.
>

Ok, will try to find out about this more from RTEMS mailing list. Would be
good if direct link to github patches or blog.

> - USB/Network - The ethernet device goes through the USB interface, which
> means that a USB stack has to be in place to access the ethernet chip.
>

any starting point for this ?

> - Console & Framebuffer graphics
> - Sound?
>
> As you can see, there is plenty to work on with the Raspberry Pi BSP.
> There are also plenty of other boards/BSPs to work on, but I am biased.
> There are over 2.5 million Pi's out there, and I believe that having first
> class RTEMS support will help to expand the RTEMS user base.
>

I agree with the viewpoint.

>
> Links to Andre's GSOC work:
> http://www.rtems.org/wiki/index.php/Raspberry_Pi_BSP_Peripherals
>
> and the blog
> http://asuolgsoc2014.wordpress.com/2014/08/18/testing-the-project/
>

Thanks for the link.

>
>
> Alan
>
>
> On Wed, Aug 20, 2014 at 5:40 AM, Hesham Moustafa <heshamelmatary at gmail.com
> > wrote:
>
>> Hi Ritesh,
>>
>> On Wed, Aug 20, 2014 at 11:28 AM, Ritesh Harjani
>> <ritesh.harjani at gmail.com> wrote:
>> > Hi All,
>> >
>> > I have been following RTEMS from quite some time rather I would say my
>> > questions have been on & off from this community (although I haven't
>> > contributed anything yet). So, this mail is mainly regarding some help
>> from
>> > the community members so that I can pitch in to contribute something to
>> this
>> > community.
>> >
>> > Based on my knowledge I would like to start from ARM bsps/raspberry pi
>> as I
>> > am seeing quite lot of development activity going on in these areas.
>> >
>> > If someone can guide me with the following activities it would be great:
>> >
>> > 1. I need to just start something, may be with a small patch (which
>> should
>> > be related to the above mentioned area):
>> > Earlier I thought of starting with some driver development but without
>> > having basic knowledge of RTEMS file structure/other areas, I wasn't
>> able to
>> > complete it.
>> >
>> > 2. Need to understand the boot flow and the code initialization routine
>> > which can give me an idea as to where all and what all drivers are
>> present
>> > etc etc..
>> >
>> >
>> > Later may be I can think of porting/developing some driver for any ARM
>> bsp.
>> >
>> >
>> > Background activity done till now:
>> >
>> > 1. Followed all the steps in Alan's Blog
>> > (
>> http://alanstechnotes.blogspot.in/2013/03/running-your-first-rtems-program-on.html
>> ):
>> > I was able to run ticker.exe sample test on Raspberry pi. Although
>> there are
>> > some doubts which I have asked below.
>> >
>> > 2. Ordered OpenOCD based JTAG board. Once this comes I will make this
>> JTAG
>> > board start working.
>> >
>> >
>> > Queries:
>> > 1. Is by default raspberry pi MMU enabled and all the page table are
>> setup
>> > ?(from HEAD of git://git.rtems.org/rtems.git)
>> >
>> > 2. I cannot see any libmmu tests which I think Hesham developed during
>> GSOC
>> > 2013 ?
>> > Do we keep this into different git ?
>> >
>> Some of my project code has been merged (mainly low-level parts of
>> libmm implemented for Raspberry Pi). The other code is held in my old
>> github repo here https://github.com/heshamelmatary/rtems-gsoc2013
>> > 3. With OpenOCD and gdb is it possible to see all the CP15 coprocessor
>> > registers on ARM ?
>> >
>> > 4. How was Hesham able to debug and see the MMU register settings(like
>> > SCTLR.MMU) during his work on GSoc 2013 libmmu development for
>> raspberry pi
>> > ? Was it QEMU ?
>> >
>> I was using QEMU for debugging Xilinx Zynq BSP, as well as Realview.
>> For Raspberry Pi (worked on the HW board, no simulators), I just used
>> printf to print out the values of registers which I need to peek into.
>> >
>> >
>> > Please feel free to guide me through the work plan if anyone have in
>> his/her
>> > mind for ARM bsps.
>> >
>> >
>> >
>> > Thanks
>> > Ritesh Harjani
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> _______________________________________________
>> devel mailing list
>> devel at rtems.org
>> http://lists.rtems.org/mailman/listinfo/devel
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.rtems.org/pipermail/devel/attachments/20140820/b6b11fe7/attachment-0002.html>