移植了一个u-boot-xlnx-xilinx-v2018.3，启动后网络ping不通，通过mdio list能够查看到PHY的型号，都是在同一网段。
uboot ping主机和主机ping uboot都不通，uboot ping自己的ip都不通。
请问有没有zynq的uboot移植教程，特别是对于涉及到网路部分的修改。已经卡在这里几天了。
print打印的信息如下：
Zynq> print
arch=arm
baudrate=115200
bitstream_image=system.bit.bin
board=zynq
board_name=zynq
boot_a_script=load ${devtype} ${devnum}:${distro_bootpart} ${scriptaddr} ${prefix}${script}; source ${scriptaddr}
boot_efi_binary=if fdt addr ${fdt_addr_r}; then bootefi bootmgr ${fdt_addr_r};else bootefi bootmgr ${fdtcontroladdr};fi;load ${devtype} ${devnum}:${distro_bootpart} ${kernel_addr_r} efi/boot/bootarm.efi; if fdt addr ${fdt_addr_r}; then bootefi ${kernel_addr_r} ${fdt_addr_r};else bootefi ${kernel_addr_r} ${fdtcontroladdr};fi
boot_extlinux=sysboot ${devtype} ${devnum}:${distro_bootpart} any ${scriptaddr} ${prefix}extlinux/extlinux.conf
boot_image=BOOT.bin
boot_net_usb_start=usb start
boot_prefixes=/ /boot/
boot_script_dhcp=boot.scr.uimg
boot_scripts=boot.scr.uimg boot.scr
boot_size=0xF00000
boot_targets=usb0 pxe dhcp
bootcmd=run $modeboot || run distro_bootcmd
bootcmd_dhcp=run boot_net_usb_start; if dhcp ${scriptaddr} ${boot_script_dhcp}; then source ${scriptaddr}; fi;setenv efi_fdtfile ${fdtfile}; if test -z "${fdtfile}" -a -n "${soc}"; then setenv efi_fdtfile ${soc}-${board}${boardver}.dtb; fi; setenv efi_old_vci ${bootp_vci};setenv efi_old_arch ${bootp_arch};setenv bootp_vci PXEClient:Arch:00010:UNDI:003000;setenv bootp_arch 0xa;if dhcp ${kernel_addr_r}; then tftpboot ${fdt_addr_r} dtb/${efi_fdtfile};if fdt addr ${fdt_addr_r}; then bootefi ${kernel_addr_r} ${fdt_addr_r}; else bootefi ${kernel_addr_r} ${fdtcontroladdr};fi;fi;setenv bootp_vci ${efi_old_vci};setenv bootp_arch ${efi_old_arch};setenv efi_fdtfile;setenv efi_old_arch;setenv efi_old_vci;
bootcmd_pxe=run boot_net_usb_start; dhcp; if pxe get; then pxe boot; fi
bootcmd_usb0=setenv devnum 0; run usb_boot
bootdelay=2
bootenv=uEnv.txt
cpu=armv7
devicetree_image=devicetree.dtb
devicetree_load_address=0x2000000
devicetree_size=0x20000
devnum=0
dfu_ram=run dfu_ram_info && dfu 0 ram 0
dfu_ram_info=set dfu_alt_info ${kernel_image} ram 0x3000000 0x500000\\;${devicetree_image} ram 0x2A00000 0x20000\\;${ramdisk_image} ram 0x2000000 0x600000
distro_bootcmd=for target in ${boot_targets}; do run bootcmd_${target}; done
efi_dtb_prefixes=/ /dtb/ /dtb/current/
ethact=ethernet@e000b000
ethaddr=00:0a:35:00:01:22
fdt_high=0x20000000
fdtcontroladdr=3ffa11d0
gatewayip=192.168.31.1
importbootenv=echo Importing environment from SD ...; env import -t ${loadbootenv_addr}
ip地址是在include/configs/zynq-common.h文件中，在#define CONFIG_EXTRA_ENV_SETTINGS 宏中添加了ip地址、网关，netmask，以及服务器的ip地址。自己在uboot下，也通过set ipaddr设置ip地址，然后saveenv设置ip地址，但是板卡上电后，ip地址会恢复成#define CONFIG_EXTRA_ENV_SETTINGS宏中的ip地址（因为感觉自己的uboot的nandflash有问题，打印的信息中也有提示NAND: zynq_nand_init: Unable detect NAND based on MIO settings
ZYNQ NAND init failed）
