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DRA821U: J721EXCPXEVM/ J7200XSOMXEVM/DRA821 Arago Yocto RT Linux vs Arago Yocto Linux

Tammy Noergaard
Prodigy 80 points
Part Number: DRA821U
Other Parts Discussed in Thread: J721EXCPXEVM, DRA821, J7200XSOMXEVM

Tool/software:

Hello,

We are evaluating the J721EXCPXEVM/ J7200XSOMXEVM/DRA821 platform. On your website saw an RT version and non-RT version. For the Arago  Yocko Linux:

1. What is the difference between the RT Linux SDK version vs not-RT Linux SDK version? How do we know which one to use for this platform?

2. What version of Ubuntu can we have on our host dev system  for installing and using the SDK to create the Yocto image? 

3. Is there an estimate for amount of  RAM for a default Arago image that it  needs/uses on the target board on the A Cores? 

Thank you.

  • 0
    TI__Expert 4335 points

    Hi Tammy,

    Tammy Noergaard said:

    1. What is the difference between the RT Linux SDK version vs not-RT Linux SDK version? How do we know which one to use for this platform?

    The RT-Linux SDK contains the code for running the RT-Linux kernel. This kernel is used to make Linux more real-time if latency is important. You can read more here: https://wiki.linuxfoundation.org/realtime/start

    Tammy Noergaard said:

    2. What version of Ubuntu can we have on our host dev system  for installing and using the SDK to create the Yocto image? 

    The ubuntu version depends on the SDK version you are using. For the 9.x sdks, ubuntu 22.04 is required.

    Tammy Noergaard said:

    3. Is there an estimate for amount of  RAM for a default Arago image that it  needs/uses on the target board on the A Cores? 

    I don't have a number for this currently, but I can try to get one if you'd like. For now though, the J721EXCPXEVM and J7200XSOMXEVM both have 4GB.

    Best,
    Jared

  • 0 in reply to Jared McArthur
    Prodigy 80 points

    Hi Jared,  Thank you.

    -"The RT-Linux SDK contains the code for running the RT-Linux kernel..." Is the RT Linux SDK for this platform also Arago Yocto based?

    - "I don't have a number for this currently, but I can try to get one if you'd like. For now though, the J721EXCPXEVM and J7200XSOMXEVM both have 4GB." Yes could you get us an for amount of RAM default Arago image needs/uses? Thank you.

    - I read that DRA821 can interface up to an additional 8GB of memory, is that on top of the 4GB so total 12 GB possible with this external interface?  Can the A Core (where we will have linux) access this additional 8GB via this external interface? Can we add the additional 8GB via the interface to your reference platform by plugging in another reference module?

    Thank you again.

  • 0 in reply to Tammy Noergaard
    TI__Expert 4335 points

    Hi Tammy,

    Tammy Noergaard said:
    Is the RT Linux SDK for this platform also Arago Yocto based?

    Yes. It runs the Arago distribution withan  RT Linux kernel underneath.

    Tammy Noergaard said:
    Yes could you get us an for amount of RAM default Arago image needs/uses?

    I will try to.

    Tammy Noergaard said:
    Can the A Core (where we will have linux) access this additional 8GB via this external interface? Can we add the additional 8GB via the interface to your reference platform by plugging in another reference module?

    You can edit the amount of DDR by following the instructions in the DDR config tool appnote. The DDR config tool has also been added to sysconfig, so you no longer have to use the excel sheet.

    Best,
    Jared

  • 0 in reply to Jared McArthur
    Prodigy 80 points

    Thank you Jared.

    I will wait for the estimate amount of RAM default Arago image needs/uses. Questions:

    Can either the RT Arago or standard Arago be certified to the Automotive standards advertised online by TI? (i.e., ASIL, etc.) Or if we need the certification for automotive we can only use one of those in our product?

    Thank you again.