potential GSOC project: Improve the Raspberry Pi BSP

Cláudio Silva claudiodcsilva at gmail.com
Wed Mar 19 21:18:17 UTC 2014


You can also look here:
https://github.com/vanvught/OpenILDA/tree/master/sdcard-mmcbb
and
https://github.com/jncronin/rpi-boot

They have compatible licenses, although I don't know the maturity of
the code base.


Cláudio

On Wed, Mar 19, 2014 at 9:10 PM, Pierre Ficheux
<pierre.ficheux at openwide.fr> wrote:
> Nevertheless, looking at U-Boot code is fine for understanding !
>
> ----- Mail original -----
>> De: "Joel Sherrill" <joel.sherrill at oarcorp.com>
>> À: "Pierre Ficheux" <pierre.ficheux at openwide.fr>
>> Cc: rtems-users at rtems.org, "Andre Marques" <andre.lousa.marques at gmail.com>
>> Envoyé: Mercredi 19 Mars 2014 22:08:15
>> Objet: Re: potential GSOC project: Improve the Raspberry Pi BSP
>>
>>
>> On 3/19/2014 3:49 PM, Pierre Ficheux wrote:
>> > Hi Joel,
>> >
>> > Looks like this version is GPLv2 (?)
>> >
>> > https://github.com/gonzoua/u-boot-pi/blob/rpi/COPYING
>> >
>> >
>> >                 GNU GENERAL PUBLIC LICENSE
>> >                    Version 2, June 1991
>> >
>> >
>> I knew I should have stopped with just "GPL" :)
>>
>> Either GPL version is inappropriate for RTEMS because it is viral.
>>
>> --joel
>> > ----- Mail original -----
>> >> De: "Joel Sherrill" <joel.sherrill at oarcorp.com>
>> >> À: "Pierre Ficheux" <pierre.ficheux at openwide.fr>, "Andre Marques"
>> >> <andre.lousa.marques at gmail.com>
>> >> Cc: rtems-users at rtems.org
>> >> Envoyé: Mercredi 19 Mars 2014 21:35:13
>> >> Objet: Re: potential GSOC project: Improve the Raspberry Pi BSP
>> >>
>> >>
>> >> On 3/19/2014 3:33 PM, Pierre Ficheux wrote:
>> >>> USB should be interesting too on RPi because of Ethernet support
>> >>> ;)
>> >> Yep. USB and Ethernet are tied together in the new tcp/ip stack.
>> >>> 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
>> >> U-Boot is GPL V3 and is off limits to lift code from.
>> >>
>> >> Minix or FreeBSD are better options.
>> >>> 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.
>> >>>>
>> >>>>
>> >>>>
>> >>>> _______________________________________________
>> >>>> rtems-users mailing list rtems-users at rtems.org
>> >>>> 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
>> >>>>
>> >>>> _______________________________________________
>> >>>> rtems-users mailing list
>> >>>> rtems-users at rtems.org
>> >>>> http://www.rtems.org/mailman/listinfo/rtems-users
>> >>>>
>> >>>>
>> >>>>
>> >>>>
>> >>>> _______________________________________________
>> >>>> rtems-users mailing list
>> >>>> rtems-users at rtems.org
>> >>>> http://www.rtems.org/mailman/listinfo/rtems-users
>> >>>>
>> >>>>
>> >>>>
>> >>>>
>> >>>>
>> >>>>
>> >>>>
>> >>>>
>> >>>> _______________________________________________
>> >>>> rtems-users mailing list
>> >>>> rtems-users at rtems.org
>> >>>> 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
>> >>
>> >>
>>
>> --
>> 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
>>
>>
>
> --
> 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
>
> _______________________________________________
> rtems-users mailing list
> rtems-users at rtems.org
> http://www.rtems.org/mailman/listinfo/rtems-users




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