potential GSOC project: Improve the Raspberry Pi BSP

Pierre Ficheux pierre.ficheux at openwide.fr
Wed Mar 19 20:49:47 UTC 2014 

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



----- 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
> 
> 

-- 
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

More information about the users mailing list