[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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