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Software Application Development FSBL 192 KB details
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FSBL 192 KB details

Former Member
Former Member over 8 years ago

Can someone please provide some more details about the 192 KB limit in the FSBL? in "Zynq-7000 All Programmable SoC Software Developers Guide" the following is stated:

 

"The size of the FSBL loaded into OCM is limited to 192 kilobyte. The full 256 kilobyte is available after the FSBL begins executing."

 

So does this mean that my FSBL CAN be larger than 192 KB?

 

The FSBL code is presumably loaded from (in my case) QSPI flash into OCM from where it begins executing. Does this mean that I have the other 64 KB available at runtime, but only after the code begins?

 

In practice, what steps can I take (linker settings, stack, heap, etc.), if any, so I can use the full 256 KB?

 

In my application, I cannot use execute-in-place (XIP) mode.

 

Thank you!

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  • zedhed
    0 zedhed over 8 years ago

    Hi rubinstu,

    I saw your thread over here also on this topic:

    http://microzed.org/content/fsbl-192kb-limit

    Can you elaborate a little further on your need to expand the size of the FSBL?  Are there requirements that prevent you from doing needed tasks in a post-FSBL executable?

    Once you do FSBL hand-off to first executable application  you can use both high and low regions in your executable applications and not carry all of the code sections from FSBL that you are not using in your application.

    Regards,

    -Kevin

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  • zedhed
    0 zedhed over 8 years ago

    Hi rubinstu,

    I saw your thread over here also on this topic:

    http://microzed.org/content/fsbl-192kb-limit

    Can you elaborate a little further on your need to expand the size of the FSBL?  Are there requirements that prevent you from doing needed tasks in a post-FSBL executable?

    Once you do FSBL hand-off to first executable application  you can use both high and low regions in your executable applications and not carry all of the code sections from FSBL that you are not using in your application.

    Regards,

    -Kevin

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