[GSOC] RPi BSP RTEMS

Joel Sherrill joel.sherrill at OARcorp.com
Mon Apr 28 15:19:06 UTC 2014


On 4/28/2014 10:01 AM, Ben Gras wrote:
> All,
>
> FWIW to anyone interested in working on the RPi BSP, I noticed the
> logic in irq.c is suspect; these tests:
>
>   if (BCM2835_REG(BCM2835_IRQ_BASIC) && 0x1)
>
> ..
>
>   else if ( BCM2835_REG(BCM2835_IRQ_BASIC) &&
> BCM2835_BIT(19))
>
> presumably intended to use bitwise ANDs. Assuming the current RPi BSP
> is your starting point, that is hopefully a little shortcut I can
> contribute.
>
Good catch Ben! Those are easy to create and overlook but hard to debug.

--joel
>
>
>
> On Mon, Apr 28, 2014 at 4:34 PM, Alan Cudmore <alan.cudmore at gmail.com
> <mailto:alan.cudmore at gmail.com>> wrote:
>
>
>
>     On Fri, Apr 25, 2014 at 6:07 PM, Andre Marques
>     <andre.lousa.marques at gmail.com
>     <mailto:andre.lousa.marques at gmail.com>> wrote:
>
>         I'm taking this conversation to the list.
>
>
>     Sorry, I didn't realize that I did not reply to the list.
>      
>
>         On 04/23/14 01:21, Alan Cudmore wrote:
>>
>>
>>
>>         On Tue, Apr 22, 2014 at 6:09 AM, Andre Marques
>>         <andre.lousa.marques at gmail.com
>>         <mailto:andre.lousa.marques at gmail.com>> wrote:
>>
>>             Hello,
>>
>>             I am very pleased to have the opportunity to participate
>>             in GSoC with the RTEMS project!
>>
>>
>>         Welcome! We are glad to have you helping RTEMS.  
>>
>>
>>             Now, I have some questions:
>>
>>             1. Does anyone have any recommendation on the proposal?
>>
>>
>>         I like the proposal, but there are a couple of things that
>>         may change slightly:
>>         1. You may want to look into making the UART driver work in
>>         interrupt driven mode, as it is currently polled.
>
>         I will have a look at it.
>
>
>>          
>>         2. For the Framebuffer support, I have been talking to
>>         someone off list that is making progress on implementing a
>>         framebuffer driver. We may want to collaborate with this
>>         person for the framebuffer. 
>>          
>
>         Certainly. I was scheduling the framebuffer work for July,
>         should that be re-scheduled?
>
>
>     July may still work. This gives us time to see what gets
>     accomplished and the work can be integrating it into the RTEMS
>     tree and testing. 
>
>      
>
>
>>
>>             2. Is there any interesting documentation or code you
>>             think I should be looking at right now? For the past
>>             month I have been studying the RPi BSP code and the RPi
>>             architecture for the emmc driver that I am doing for my
>>             final project at the university.
>>
>>         From what I can see, you are off to a very good start!
>>          
>>
>>             3. There is no wiki page for the Raspberry Pi BSP (at
>>             least I have not found any yet). May I create one using
>>             the Open Project template and link it in the Open
>>             Projects page under the BSP section?
>>
>>
>>         I did not create one, so please do.
>>          
>>
>>
>>             4. I will create a dedicated development blog for the
>>             project very soon. How frequently should it be updated
>>             until may 19?
>>
>>             5. How should the communication happen? Also I am not
>>             sure if the Amar Takhar and Muhammad Adnan e-mails are
>>             the correct ones.
>>
>>             I will also be setting a github repository for this, and
>>             I am also looking to get my own RPi and some peripherals
>>             (I have one at the university right now).
>>
>>
>>         I have been setting up my Pi for RTEMS development again. I
>>         recently built u-boot and I am going to try to get it to boot
>>         RTEMS images from a TFTP server. This may help speed up
>>         development. 
>>
>>         I am also trying out a FT2232H MiniMod evaluation board that
>>         is supposed to work with the Raspberry Pi JTAG interface and
>>         the OpenOCD project. It also serves as the USB uart
>>         connector. I have it all wired up and I hope to try getting
>>         it to talk to OpenOCD soon. If I get it working, I will
>>         document everything. The FT2232H Minimod board was $20 USD. 
>>
>
>         Nice. Looking forward to that, as I still need to look at the
>         debugging part of the development.
>
>
>     The FT2232H MiniMod is working so far! I am able to use the UART
>     and at the same time load and run images over the JTAG interface
>     using OpenOCD. Next, I plan on trying GDB. I will try to document
>     the setup soon, but it just requires ~10 jumper wires to connect
>     the MiniMod to the Pi GPIO header. 
>
>     I need to use it, because I discovered that the RKI image no
>     longer runs on the Pi. The samples such as ticker still work, so
>     I'm sure it is a problem with the RKI code itself. 
>      
>
>
>         Meanwhile I have set up a development blog and a google
>         calendar for the project:
>
>         http://asuolgsoc2014.wordpress.com/
>
>         https://www.google.com/calendar/embed?src=mo5guprvls0ip24rnrjio4ogks%40group.calendar.google.com&ctz=Europe/Lisbon
>
>         I will try to come up with more news during the weekend.
>
>
>     Looks good.
>
>     Alan
>
>      
>
>
>>         Alan
>>
>>          
>>
>>
>>             Thank you,
>>             André Marques.
>>
>>
>
>
>
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>
>

-- 
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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