PS GTR 1000BaseX ZCU102

In this demo we shall show how to demo the PS GTR using 1000BaseX on the zcu102, and how to debug.

Create the HW:

Here, I used Vivado 2018.1. The PCW can be seen below:

Clocking:

Generate Output Products, Create Wrapper, Generate Bitstream, and Export to SDK (to create the HDF)

Create Linux Image:

• petalinux-create –t project –template zynqMP –n gt_loopback
• cd gt loopback
• petalinux-config –get-hw-description=<path to HDF>
• Update GEM nodes for Fixed link (see appendix A)
• Update Linux Kernel recipe to add patch to disable AN (See appendix B)
• petalinux-build
• cd images/linux
• petalinux-package --boot --fpga system.bit --u-boot

Or, use the BSP I created here

• petalinux-create -t project -s <path to bsp>.bsp

Testing on HW:

Place the Boot.bin, and image.ub onto an SD card and boot to u-boot:

Place the PS-GTR into loopback, and boot:

Bring the eth1 up (I didn’t add this to the alias in the DT. So, I needed to add this manually):

As you can see I need to read the pcs_status twice to see the link_status go high.

pcs_select (bit 11 in the network_config) is set too.

Resetting the GTR:

In the UG1085 V 1.8 page 800 there is a *note* about GTR reset is performed by a controller reset

The GEM reset can be seen here:

Register 0xFF5E0230 (CRL_APB)

Note: These registers are seen here

https://www.xilinx.com/html_docs/registers/ug1087/ug1087-zynq-ultrascale-registers.html 

So this should be a good reference for debugging:

/include/ "system-conf.dtsi"
/ {
   chosen {
      bootargs = "earlycon clk_ignore_unused cpuidle.off=1";
      stdout-path = "serial0:115200n8";
 
   };
};
 
&gem2 {
    is-internal-pcspma;
    phy-mode = "moca";
    fixed-link {
        speed = <1000>;
        full-duplex;
    };
};
 
&gem3 {
    is-internal-pcspma;
    phy-mode = "moca";
    fixed-link {
        speed = <1000>;
        full-duplex;
    };
};

Appendix A: Patching Linux Kernel:

Create the folder structure as shown below:

Copy the linux kernel patch to linux-xlnx

Update the linux-xlnx_%.bbappend as shown below:

SRC_URI_append = " file://0001_disable_an_linux.patch"
             
FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"

The patch can be seen here 0001_disable_an_linux.patch