potential GSOC project: Improve the Raspberry Pi BSP

Wed Mar 19 20:33:59 UTC 2014

USB should be interesting too on RPi because of Ethernet support ;)

Regarding SD card you should take a look at U-Boot for RPi which includes MMC support in drivers/mmc. U-Boot includes USB support for RPi too in drivers/usb.

https://github.com/gonzoua/u-boot-pi

regards

----- Mail original -----
> De: "Andre Marques" <andre.lousa.marques at gmail.com>
> À: "Alan Cudmore" <alan.cudmore at gmail.com>
> Cc: rtems-users at rtems.org
> Envoyé: Mercredi 19 Mars 2014 20:59:56
> Objet: Re: potential GSOC project: Improve the Raspberry Pi BSP
> 
> 
> 
> Hello Alan,
> 
> I have decided to go with the framebuffer instead of the USB support.
> Will update the proposal with this.
> 
> Before GSOC I am considering to look at the SD card access through
> the onboard card reader. What do you think?
> 
> --André Marques.
> 
> On 03/19/14 00:56, Alan Cudmore wrote:
> 
> 
> 
> Hi André ,
> I agree about the USB stack. I am not even sure about how to
> integrate a driver that depends on the FreeBSD USB stack.
> 
> 
> The GPIO driver from Pierre is the one I was referring to. I don't
> think anyone ever made a decision on how to integrate the GPIO
> driver. If we have macros in the BSP header files then the GPIO can
> be programmed with the simple macros or the driver that Pierre
> wrote. If the project decides to use the GPIO device model for other
> BSPs, then the generic driver code can be moved to a shared
> directory at a later date.
> 
> 
> Thanks for the update,
> 
> 
> Alan
> 
> 
> 
> 
> 
> On Tue, Mar 18, 2014 at 11:04 AM, Andre Marques <
> andre.lousa.marques at gmail.com > wrote:
> 
> 
> 
> 
> Hello,
> 
> about the USB driver port from FreeBSD I am finding it difficult to
> gauge how much work it would involve, so I will follow your
> suggestion and look at something else.
> 
> As for GPIO I belive the work that has been done is this:
> 
> https://github.com/pficheux/raspberry_pi/tree/master/RTEMS/gpio_driver
> 
> Am I right?
> 
> I also found a discussion on the best way of implementing the driver
> 
> http://www.rtems.org/pipermail/rtems-users/2013-October/012059.html
> 
> but i am not sure if that came to a decision.
> 
> Meanwhile I will update the proposal with some basic info on the
> drivers.
> 
> --André Marques.
> 
> 
> 
> On 03/14/14 13:16, Andre Marques wrote:
> 
> 
> 
> 
> 
> Hello,
> 
> On 03/14/14 02:33, Alan Cudmore wrote:
> 
> 
> 
> Andre,
> I think your project proposal looks good, but I wonder if including
> USB support is too much. There are low level "bare metal" USB
> examples out there for the Raspberry Pi, and that may serve as a
> starting point, but I think a real USB implementation will use the
> BSD library that has been ported to RTEMS. It may be possible, since
> there is a FreeBSD port to the Raspberry Pi. Maybe others can help
> here.
> 
> 
> I will take a look into this.
> 
> 
> 
> 
> 
> If you think that GPIO, SPI, and I2C are not enough, then you could
> always look at the framebuffer or SD card access.
> 
> 
> Yes, right now I am trying to clarify everything the best I can so I
> don't end up with a lot more (or less) work than I can handle.
> 
> 
> 
> 
> 
> Finally, it may be necessary to have an Raspberry Pi and a few
> peripherals. For example, I have an inexpensive I2C compass module
> that I use with linux, and I have a breadboard wired up with LEDs to
> test GPIO.
> 
> 
> Right now I have access to a Raspberry Pi at the university, not sure
> about the peripherals though. Anyway, if this projects really goes
> forward I will get myself a raspberry and peripherals (I have
> already some other components, like a breadboard, leds, wire, etc).
> 
> 
> 
> 
> 
> Thanks,
> Alan
> 
> 
> 
> 
> 
> On Thu, Mar 13, 2014 at 8:32 PM, Alan Cudmore <
> alan.cudmore at gmail.com > wrote:
> 
> 
> 
> I'm glad there is interest in this project. Andre, I will read your
> proposal and provide feedback.
> Joel, I was on the melange site and the system recognizes my account.
> Do I need to do anything to be a mentor for RTEMS?
> Alan
> 
> 
> 
> 
> 
> 
> 
> On Thu, Mar 13, 2014 at 7:31 PM, Andre Marques <
> andre.lousa.marques at gmail.com > wrote:
> 
> 
> 
> 
> It is now on melange too.
> 
> --André Marques.
> 
> 
> 
> On 03/13/14 23:21, Hesham Moustafa wrote:
> 
> 
> 
> 
> 
> Hi Andre,
> 
> 
> I quote from RTEMS SoC page :
> 
> "GSOC STUDENTS! PLEASE FILL IN THE APPLICATION AT
> http://www.google-melange.com ! YOU CAN EDIT UNTIL THE DEADLINE! BUT
> YOU WILL NOT GET A SLOT IF YOU DO NOT APPLY THROUGH Google!!!"
> 
> 
> Regards,
> Hesham
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> On Fri, Mar 14, 2014 at 1:16 AM, Andre Marques <
> andre.lousa.marques at gmail.com > wrote:
> 
> 
> 
> 
> Hello,
> 
> I just posted the first proposal draft for "Raspberry Pi BSP
> Peripherals " in the RTEMS Wiki
> 
> http://wiki.rtems.org/wiki/index.php/RTEMSSummerOfCode
> 
> Any feedback is more than welcome. Should I post it already in
> melange too?
> 
> --André Marques.
> 
> 
> 
> On 03/13/14 15:26, Joel Sherrill wrote:
> 
> 
> 
> 
> 
> 
> On 3/13/2014 9:46 AM, Andre Marques wrote:
> 
> 
> 
> Hello,
> 
> I would be very interested in working in this project because I'm
> currently trying to work with Raspberry Pi and RTEMS for my
> undergraduate thesis, so this could be a great followup to that for
> the summer.
> 
> I will need to do some reseach on it before making a proposal (the
> time is also gettting shorter), but will post a proposal draft very
> soon.
> 
> This would be a great area to work. As Alan says, the list is likely
> too much for
> one student, so it seems likely that the work could be divided for
> two students
> working on different parts.
> 
> For the Pi Master list, I would like to add the Geert board. That
> looks like something
> of interest to RTEMS folks.
> 
> --joel
> 
> 
> 
> 
> --André Marques.
> 
> On 03/13/14 11:23, Alan Cudmore wrote:
> 
> 
> 
> ( I posted this to the rtems-devel list by mistake, my apologies for
> the duplicate message )
> 
> 
> 
> f there are still potential GSOC students out there looking for a
> project, I would like to offer a potential project to work on:
> Improving the Raspberry Pi BSP. I would be happy to mentor a student
> for this project. Below is my description for the task.
> 
> 
> Thanks,
> Alan
> 
> 
> One of the RTEMS Open Projects is to contribute a BSP or Board
> Support Package for readily available boards. The Raspberry Pi is
> probably the most available board at $25 and $35 USD, and there have
> been over two million of these boards sold. The RTEMS head (4.11)
> currently has a basic BSP for the Raspberry Pi, supporting the CPU,
> a single UART, and timer. It is enough to run some basic RTEMS
> programs, but expanding the BSP to support peripherals will make it
> much more useful.
> For this project, the GSOC student could improve the peripheral
> support for the Raspberry Pi BSP.
> The peripherals we need to support (in order of increasing
> difficulty) include:
> 1. GPIO (This has been done by one user, but is not integrated)
> 2. I2C Bus
> 3. SPI Bus
> 4. Secure Digital card read and write support (using the SPI bus)
> 5. Graphics / RTEMS Framebuffer Support (I have a graphics demo
> working in an RTEMS task)
> 6. USB Device support
> 7. HDMI/Graphics console (Requires framebuffer support and USB or
> GPIO connected keyboard device)
> 8. Ethernet network support (Requires USB support)
> The entire list is probably too much for a single student to
> accomplish, so we can adjust the list of work according to what is
> possible.
> 
> 
> It may also be a good idea to add support for both models of the
> Raspberry Pi (256MB and 512MB) and be able to configure the memory
> map in the BSP to match the boot time split between the CPU and GPU
> memory.
> 
> 
> Finally, in order to do some of this coding, it may be necessary to
> come up with a more efficient way to load and debug code on the
> Raspberry Pi. Options include using U-boot or connecting a JTAG
> debug device to load code.
> 
> 
> 
> _______________________________________________
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> http://www.rtems.org/mailman/listinfo/rtems-users
> 
> --
> Joel Sherrill, Ph.D.             Director of Research & Development
> joel.sherrill at OARcorp.com On-Line Applications Research
> Ask me about RTEMS: a free RTOS  Huntsville AL 35805
> Support Available (256) 722-9985
> 
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-- 
Pierre FICHEUX -/- CTO OW/OWI, France -\- pierre.ficheux at openwide.fr
                                         http://ingenierie.openwide.fr
                                         http://www.linuxembedded.fr
I would love to change the world, but they won't give me the source code