[GSOC] RPi BSP RTEMS

[Ben Gras]

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.




On Mon, Apr 28, 2014 at 4:34 PM, Alan Cudmore <alan.cudmore at gmail.com>wrote:

>
>
> On Fri, Apr 25, 2014 at 6:07 PM, Andre Marques <
> 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> 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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>
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