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Enabling POST in Uboot

Former Member

I need to enable the uboot POST for testing memory on the Zed board (Xilinx Zynqu00AE-7000 All-Programmable SoC - ARM dual-core Cortexu2122-A9 + 28 nm programmable logic with Analog Devices AD-FMCOMMS3-EBZ FMC module featuring the AD9361).

Can this be achieved only by modification of the uboot source code ? Or, is there any sequence of keystrokes at the time of booting, for enabling the same?

I added the define directive #define CONFIG_POST  CONFIG_SYS_POST_MEMORY in the zynq_zed.h
file. in directory include/configs of u-boot source(2014.07). But when I built it the following errors are displayed:

1)t_POST_WORD_ADDR currently not implemented for this platform! (file include/post.h).

2)tpost_word_load() undeclared (file include/post.h).

3)tPost_word_store() undeclared (file include/post.h).


What other modifications are required to enable POST ?

- Suresh

  • 0

    Hi Suresh,

    According to this article, there may be some other #defines that need to be in place for POST to become enabled.

    http://blackfin.uclinux.org/doku.php?id=bootloaders:u-boot:post

    Regards,

    -Kevin

  • 0

    Hi Suresh,

      I confess I'd never heard of the U-boot POST tests before I saw your forum entry.   As you probably did before me, I did some fruitless searching for decent documentation on this feature, but I really didn't find much beyond implementations for the Blackfin.   Looking at the latest U-boot code from mainline, I see that only a very limited number of boards have been included to date, so I suspect this is not a very popular feature. 

    Since there is no code for the Zynq architecture, and no source implementation for specific Zynq boards, enabling the configuration items is not sufficient, as you have found.   If I had to implement this myself, I would start with the <u-boot-dir>/post/post.c file and use the implementation there to augment to code for a chosen board.  It looks like there will be numerous files you would have to create in that directory to fully implement the POST operations for a new architecture.

    It might be worth posting a question on the Xilinx community forum to see if anyone is currently working on this.

    That's about the best I've got for this.  Sorry!

    Ron

  • 0 in reply to Former Member

    Hi Ron,

    Thanks for providing the information that POST is not currently implemented for Zynq architecture. I did not have a detailed study of the u-boot code. I only had a quick glance through the directories, when I happened to notice the files like post.c and directives like CONFIG_POST.  I also came across some memory test functions in a file named memory.c   in the <u-boot-dir>/post/drivers directory. I wrongly assumed that these memory test functions will be executed by all boards, once POST is enabled.

    Now, I understand that implementation of POST for a new architecture is not an easy task. I have already posted a question to Xilinx community forum. Hope someone is currently working on this.

    Suresh

  • 0 in reply to Former Member

    Hi Suresh!

    Have you got to write something? Could you share it?

  • 0 in reply to Former Member

    I'm currently poring over the code for POST support in U-Boot, not specifically for Zedboard, but when I'm done, I plan on writing up a decent tutorial and posting it online. If someone has any sample tests for Zedboard they'd like to share, I can add them to my tutorial for a more comprehensive explanation. Thank you kindly.

    rday