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MicroZed Hardware Design Differences in DTS from reference Linux design and Vivado with TCL config
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Differences in DTS from reference Linux design and Vivado with TCL config

Former Member
Former Member over 12 years ago

I created a really simple DTS using Vivado and noticed a lot of differences between it and the DTS in your Linux reference design from Aug 10th.  One in particular that seems to be problematic for me is the SD clock frequency.  The reference design has clock-frequency = <125000000> and xlnx,sdio-clk-freq-hz = <0x3f93e10>.  The hex value is 66.666MHz (not 125MHz).


After running your latest TCL script in Vivado for PS config for MicroZed, it gives me clock-frequency = <50000000> and xlnx,sdio-clk-freq-hz = <0x2faf080>, which in base 10 is 50MHz.  So while my configuration made sense to me, it didn't work.  I didn't see the SD card in /dev when running the reference Xilinx ramdisk.


I changed it to clock-frequency = <66666000> and xlnx,sdio-clk-freq-hz = <0x3f93e10>.  This seems to work with my DTS/DTB.


There are other small differences that I can't explain or know if they affect me:


ps7_ethernet_0: ps7-ethernet@e000b000 {
...
interrupts = < 0 22 1 >;
...
xlnx,enet-reset = <0xffffffff>;tt
...
phy 0: phy@0
...
};


versus


ps7_ethernet_0: ps7-ethernet@e000b000 {
...
tttinterrupts = < 0 22 4 >;
tttxlnx,enet-reset = "";
...
phy0: phy@7
};
tt

gpio masks, xlnx,usb-reset

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  • Former Member
    0 Former Member over 12 years ago

    I get the same issue. Have you resolved this? After exporting to SDK & building I have to tweak the .dts file to revert back to 125 MHz. The Vivado .bd GUI shows 125 MHz. Why does it configure it for 50?

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  • Former Member
    0 Former Member over 12 years ago in reply to Former Member

    I think the Xilinx SDK DTS generator is just simply broken.  So I've been merging the reference DTS provided by Xilinx and AvNet with the generated DTS from SDK.

    Generate a DTS file from the Xilinx SDK of the most vanilla Zynq design you have.  Put it in a safe place as a reference.

    When you create a custom Zynq design, generate the DTS using SDK.  Use a diff tool to compare the two generated DTS files so you can see what the unique parts of the design have added to the DTS.

    Then take those changes and merge them by hand into the reference DTS from the vendor.

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