Intel®︎ Cyclone®︎ V SoC: No network interface is recognized

Question

Hello everyone,

I have zepyhr running on the Cyclone V according to the following instructions: https://docs.nordicsemi.com/bundle/ncs-2.5.2/page/zephyr/boards/arm/cyclonev_socdk/doc/index.html
Next I wanted to establish a simple network communication. I use the already written Example of a DHCP client under the directory .../zephyrproject/zephyr/samples/net/dhcpv4_client but the following error message appears:

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[00:00:00.207,000] <err> net_if: There is no network interface to work with!
*** Booting Zephyr OS build v4.0.0-3095-gd9eed167d06b ***
Run dhcpv4 client
[00:00:00.380,000] <wrn> net_if: No default interface found!
uart:~$ device list
devices:
- intc@fffed000 (READY)
  DT node labels: intc
- gpio@ff70a000 (READY)
  DT node labels: gpio2
- gpio@ff709000 (READY)
  DT node labels: gpio1
- gpio@ff708000 (READY)
  DT node labels: gpio0
- serial1@ffc03000 (READY)
  DT node labels: uart1
- serial0@ffc02000 (READY)
  DT node labels: uart0
- sysmgr@ffd08000 (READY)
  DT node labels: sysmgr

Normally, the Ethernet device should also be recognized (gmac0/gmac1) ...

I know that this example was not written explicitly for my hardware. I found the folder “Boards” in the project directory, which had a .conf file and an .overlay file, so I created two files cyclonev.conf & cyclonev.overlay. In the following I show my prj.conf and cyclonev.conf & cyclonev.overlay files:

prj.conf:

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#No changes have been made
CONFIG_NETWORKING=y
CONFIG_NET_IPV6=n
CONFIG_NET_IPV4=y
CONFIG_NET_ARP=y
CONFIG_NET_UDP=y
CONFIG_NET_DHCPV4=y
CONFIG_NET_DHCPV4_OPTION_CALLBACKS=y
CONFIG_DNS_RESOLVER=y

CONFIG_TEST_RANDOM_GENERATOR=y

CONFIG_INIT_STACKS=y

CONFIG_NET_MGMT=y
CONFIG_NET_MGMT_EVENT=y

CONFIG_NET_LOG=y
CONFIG_LOG=y

CONFIG_SLIP_STATISTICS=n
CONFIG_NET_SHELL=y

cyclonev.conf:

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CONFIG_ETH_CYCLONEV=y
CONFIG_NET_L2_ETHERNET=y
CONFIG_NET_MGMT=y
CONFIG_NET_DHCPV4=y
CONFIG_NET_TCP=y
CONFIG_NET_LOG=y
CONFIG_NET_IPV4=y

cyclonev.overlay:

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&gmac1 {
    status = "okay";
    local-mac-address = [e6 88 2d 82 1f d4];
};
&gmac0 {
    status = "disabled"; 
};

I'll show you an excerpt from my zepyhr.dts file:

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gmac0: ethernet@ff700000 {
		compatible = "snps,ethernet-cyclonev";
		reg = < 0xff700000 0x2000 >;
		interrupts = < 0x0 0x73 0x4 0xa0 >;
		emac-index = < 0x0 >;
		status = "disabled";
	};
gmac1: ethernet@ff702000 {
	compatible = "snps,ethernet-cyclonev";
	reg = < 0xff702000 0x2000 >;
	interrupts = < 0x0 0x78 0x4 0xa0 >;
	emac-index = < 0x1 >;
	status = "okay";
	local-mac-address = [ E6 88 2D 82 1F D4 ];
};

I have tried a lot of other things. For example I tried to enable gmac1 and disable gmac0 or disable both but without success. I had seen the approach with the own .conf and the .overlay file several times (e.g. for a STM32). So I think my approach is correct, but no network interface is recognized (Ethernent). I hope that someone sees my mistake and can help me. I would be very grateful for that. Finally, I'll insert a small screenshot from the documentation showing which Ethernet interface I'm using: