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ZedBoard Hardware Design linux crash after PL load
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Related

linux crash after PL load

Former Member
Former Member over 13 years ago

I have made a simple hardware design for the PL. I can load it with either JTAG or by cat'ing the file into xdevcfg. Once the hardware is loaded, it functions properly. Howver, all contact with the PS (running Linux) is gone. No terminal, no ethernet. Is it not possible to just load a bit file with no reference to the processor? Looking in the UCF there doesn't appear to be any reference to any processor specific IOs. I'm guessing that I need to route some PS dedicated pins to some specific hardware pins, but I would have thought that could be done without anything loaded into the PL at all. Any insight would be appreciated.

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  • Former Member
    0 Former Member over 13 years ago

    jeffalred,

    Zynq is designed around the idea that the ARM cores are the center of the IC.  With that being said, the PS must be up and running before the PL can be programmed.

    Can you describe further your setup and configuration of how you went about creating your project and what you loaded into the PL?

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  • Former Member
    0 Former Member over 13 years ago in reply to Former Member

    I used the out of the box setup for the zed. Standard Linux demo.

    Then I built a bitfile (using the UCF from this website) that simply sets the LEDs based. On the switches. Built it in ISE and created a BIN file with promgen. With the PS up and running, I loaded the bitfile over jtag. The Linux terminal window quit responding as well as ping stopped responding. Same thing when I used local Linux commands to load. Each time the Linux terminal stopped but the programmed functionality in PL worked as expected.

    I thought the idea was that the processor cores are not dependent on the PL.

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  • Former Member
    0 Former Member over 13 years ago in reply to Former Member

    The PS is not dependent on the on the PL.  I am going to make the assumption that the Linux kernel is trying to talk to the AXI peripherals on a regular interval, and when you reconfigure the PL it crashes because it can't talk.

    I'll take a look and see what I can come up with for a 'proper procedure'.

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  • Former Member
    0 Former Member over 13 years ago in reply to Former Member

    Is it possible that one of the kernel modules is polling on the AXI?

    I have no problem putting in the minimal logic that would allow linux to stay alive. Just need to know what that minimal logic is.

    Thanks for checking into it.

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  • Former Member
    0 Former Member over 13 years ago in reply to Former Member

    I agree that it is probably something along those lines.  That the OLED module is pinging the SPI bus - or something like that.  Can you try and unload the OLED module by executing the script in /usr/bin/oled_unload?

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  • Former Member
    0 Former Member over 13 years ago

    I'm away from my board right now, but I'll give it a shot as soon as I can.

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  • Former Member
    0 Former Member over 13 years ago in reply to Former Member

    Sounds good.  I am away from mine as well.  When I am back in front of it I'll see what else I can come up with.

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  • Former Member
    0 Former Member over 13 years ago

    Hi jeffallred, I have tried to design a simple IPcore and use it in Linux. "FSBL.elf" can load your hardware bitstream to PL. Then, your hardware must have a AXI interface and connect it to the internal AXI interface of PS.All this can be finished in Xilinx Platform Studio(XPS). http://wiki.xilinx.com/zc702-boot-from-flash  this website maybe helpful.
    PS. I really no good at English.Sorry for the grammar mistake :)

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  • Former Member
    0 Former Member over 13 years ago in reply to Former Member

    You say "your hardware must have a AXI interface". Is this a documented requirement? Is Linux polling the AXI or does the lack of an AXI interface in the PL cause an interrupt?

    It seems very dangerous to the system if loading the PL with a design that doesn't include a particular interface causes the OS to crash.

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  • Former Member
    0 Former Member over 13 years ago in reply to Former Member

    No go. I rmmod'd the pmodoled_gpio module and tried to load in a bit file. Still crashes.

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