imx6q linux 6.1 Mickledore: ethernet fec 2188000.ethernet eth0: rcv is not +last

daharingwitekio · ‎10-13-2023

Hi, I'm trying to set up an existing project using an i.MX6Q with the latest kernel (I'm using linux-imx 6.1), latest uboot-imx (2023.04) and Yocto Mickledore. My reference board is the imx6q-sabresd. I've enabled the fec ethernet in the DTS with the following:

&fec {
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_enet>;
	phy-mode = "rgmii-id";
	phy-handle = <&phy>;
	fsl,magic-packet;
	status = "okay";

	mdio {
		#address-cells = <1>;
		#size-cells = <0>;

		phy: ethernet-phy@1 {
			reg = <1>;
			qca,clk-out-frequency = <125000000>;
			reset-gpios = <&gpio1 25 GPIO_ACTIVE_LOW>;
			reset-assert-us = <10000>;
		};
	};
};

&iomuxc {
	imx6q-device {
		pinctrl_enet: enetgrp_fec {
			fsl,pins = <
				MX6QDL_PAD_ENET_MDIO__ENET_MDIO			0x1b0b0
				MX6QDL_PAD_ENET_MDC__ENET_MDC			0x1b0b0
				MX6QDL_PAD_RGMII_TXC__RGMII_TXC			0x1b0b0
				MX6QDL_PAD_RGMII_TD0__RGMII_TD0			0x1b0b0
				MX6QDL_PAD_RGMII_TD1__RGMII_TD1			0x1b0b0
				MX6QDL_PAD_RGMII_TD2__RGMII_TD2			0x1b0b0
				MX6QDL_PAD_RGMII_TD3__RGMII_TD3			0x1b0b0
				MX6QDL_PAD_RGMII_TX_CTL__RGMII_TX_CTL	0x10030
				MX6QDL_PAD_ENET_REF_CLK__ENET_TX_CLK	0x100b0
				MX6QDL_PAD_RGMII_RXC__RGMII_RXC			0x1b0b0
				MX6QDL_PAD_RGMII_RD0__RGMII_RD0			0x1b0b0
				MX6QDL_PAD_RGMII_RD1__RGMII_RD1			0x1b0b0
				MX6QDL_PAD_RGMII_RD2__RGMII_RD2			0x1b0b0
				MX6QDL_PAD_RGMII_RD3__RGMII_RD3			0x1b0b0
				MX6QDL_PAD_RGMII_RX_CTL__RGMII_RX_CTL	0x1b0b0
				MX6QDL_PAD_GPIO_16__ENET_REF_CLK		0x4001b0a8
				MX6QDL_PAD_ENET_TX_EN__GPIO1_IO28		0x80000000
			>;
		};
	};
};

When I use boot into Linux, I can see the ethernet device with `ifconfig`:

root@machine-name:~# ifconfig
eth0      Link encap:Ethernet  HWaddr 0C:92:4E:00:36:46  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

However, when I plug an Ethernet cable into the device, I get a bunch of these logs:

[   35.296600] fec 2188000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[   35.305602] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[   36.520866] fec 2188000.ethernet eth0: rcv is not +last
[   41.512868] fec 2188000.ethernet eth0: rcv is not +last
[   41.519520] fec 2188000.ethernet eth0: rcv is not +last
[   41.525027] fec 2188000.ethernet eth0: rcv is not +last
[   41.530820] fec 2188000.ethernet eth0: rcv is not +last
[   41.536440] fec 2188000.ethernet eth0: rcv is not +last
[   41.542103] fec 2188000.ethernet eth0: rcv is not +last
[   41.547927] fec 2188000.ethernet eth0: rcv is not +last
[   41.553725] fec 2188000.ethernet eth0: rcv is not +last
[   41.559345] fec 2188000.ethernet eth0: rcv is not +last
[   41.565024] fec 2188000.ethernet eth0: rcv is not +last
[   41.570601] fec 2188000.ethernet eth0: rcv is not +last
[   41.576054] fec 2188000.ethernet eth0: rcv is not +last
[   41.581491] fec 2188000.ethernet eth0: rcv is not +last
[   41.586877] fec 2188000.ethernet eth0: rcv is not +last
[   41.592426] fec 2188000.ethernet eth0: rcv is not +last
[   41.598503] fec 2188000.ethernet eth0: rcv is not +last
[   46.514977] fec 2188000.ethernet eth0: rcv is not +last
[   46.521103] fec 2188000.ethernet eth0: rcv is not +last
[   46.526655] fec 2188000.ethernet eth0: rcv is not +last
[   46.532199] fec 2188000.ethernet eth0: rcv is not +last
[   46.537718] fec 2188000.ethernet eth0: rcv is not +last
[   46.543333] fec 2188000.ethernet eth0: rcv is not +last
[   46.549479] fec 2188000.ethernet eth0: rcv is not +last
[   46.555185] fec 2188000.ethernet eth0: rcv is not +last
[   46.560778] fec 2188000.ethernet eth0: rcv is not +last
[   46.566350] fec 2188000.ethernet eth0: rcv is not +last
[   46.571921] fec 2188000.ethernet eth0: rcv is not +last
[   46.577378] fec 2188000.ethernet eth0: rcv is not +last
[   46.582808] fec 2188000.ethernet eth0: rcv is not +last
[   46.588174] fec 2188000.ethernet eth0: rcv is not +last
[   46.593606] fec 2188000.ethernet eth0: rcv is not +last
[   46.599659] fec 2188000.ethernet eth0: rcv is not +last

I see from Google that back in Kernel 3.0, there was a bug that produced this, but this was a long time ago and it was patched.

Does anyone have any insight into this issue?

daharingwitekio · ‎10-19-2023

Turns out I think I had multiple issues. The first might have been that I was missing some kernel configs. I'm not sure which ones specifically though. But the primary fix was manually setting the ethernet speed to a slower speed. First I did it with `ethtool -s enp0s3 autoneg on speed 100 duplex full`. But a more useful fix was to set the max speed of the PHY in the device tree:

max-speed = <100>; // Set max speed to 100 Mbps due to imx6 Ethernet errata

in the `phy: ethernet-phy@1` node. This caps the speed which fixed my issue due to the gigabit ethernet errata on the imx6.

View solution in original post

daharingwitekio · ‎10-19-2023

Turns out I think I had multiple issues. The first might have been that I was missing some kernel configs. I'm not sure which ones specifically though. But the primary fix was manually setting the ethernet speed to a slower speed. First I did it with `ethtool -s enp0s3 autoneg on speed 100 duplex full`. But a more useful fix was to set the max speed of the PHY in the device tree:

max-speed = <100>; // Set max speed to 100 Mbps due to imx6 Ethernet errata

in the `phy: ethernet-phy@1` node. This caps the speed which fixed my issue due to the gigabit ethernet errata on the imx6.

Bio_TICFSL · ‎10-16-2023

Hello,

Tyr to change the fec.c installed on your BSP, After we changed the buffer defines in the fec driver it works for us.

#define FEC_RX_DISABLED_IMASK (FEC_DEFAULT_IMASK & (~FEC_ENET_RXF))

/* The FEC stores dest/src/type, data, and checksum for receive packets.

*/

-#define PKT_MAXBUF_SIZE

1518

#define PKT_MAXBUF_SIZE		1534
#define PKT_MINBUF_SIZE		64
#define PKT_MAXBLR_SIZE		1520

#define PKT_MAXBLR_SIZE

1536

/*

* The 5270/5271/5280/5282/532x RX control register also contains maximum frame

* size bits. Other FEC hardware does not, so we need to take that into

Regards

daharingwitekio · ‎10-16-2023

`fec.c` no longer exists in linux-imx 6.1. I've seen the older post that suggested these changes but the code is a bit different now.

PKT_MAXBUF_SIZE and PKT_MINBUF_SIZE are both defined in both fec_main.c and fs_enet.h now. And PKT_MAXBLR_SIZE is defined in `fs_enet.h` now.

Also, could you clarify what value I should actually use? The values in your post list both '1518' and '1534' for PKT_MAXBUF_SIZE and both '1520' and '1536' for PKT_MAXBLR_SIZE.

Bio_TICFSL · ‎10-19-2023

hi，

I test the 6.1.36-2.1.0 version on imx6q-sabresd. There is no such error. The following is my dts about FEC node. You can also reference the imx6qdl-sabresd.dtsi file of the kernel 6.1.36-2.1.0 version.

&fec {

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_enet>;

phy-mode = "rgmii-id";

phy-handle = <&phy>;

fsl,magic-packet;

status = "okay";

mdio {

#address-cells = <1>;

#size-cells = <0>;

phy: ethernet-phy@1 {

reg = <1>;

qca,clk-out-frequency = <125000000>;

reset-gpios = <&gpio1 25 GPIO_ACTIVE_LOW>;

reset-assert-us = <10000>;

};

pinctrl_enet: enetgrp {

fsl,pins = <

MX6QDL_PAD_ENET_MDIO__ENET_MDIO 0x1b0b0

MX6QDL_PAD_ENET_MDC__ENET_MDC 0x1b0b0

MX6QDL_PAD_RGMII_TXC__RGMII_TXC 0x1b030

MX6QDL_PAD_RGMII_TD0__RGMII_TD0 0x1b030

MX6QDL_PAD_RGMII_TD1__RGMII_TD1 0x1b030

MX6QDL_PAD_RGMII_TD2__RGMII_TD2 0x1b030

MX6QDL_PAD_RGMII_TD3__RGMII_TD3 0x1b030

MX6QDL_PAD_RGMII_TX_CTL__RGMII_TX_CTL 0x1b030

MX6QDL_PAD_ENET_REF_CLK__ENET_TX_CLK 0x1b0b0

MX6QDL_PAD_RGMII_RXC__RGMII_RXC 0x1b030

MX6QDL_PAD_RGMII_RD0__RGMII_RD0 0x1b030

MX6QDL_PAD_RGMII_RD1__RGMII_RD1 0x1b030

MX6QDL_PAD_RGMII_RD2__RGMII_RD2 0x1b030

MX6QDL_PAD_RGMII_RD3__RGMII_RD3 0x1b030

MX6QDL_PAD_RGMII_RX_CTL__RGMII_RX_CTL 0x1b030

MX6QDL_PAD_GPIO_16__ENET_REF_CLK 0x4001b0a8

>;

};

pinctrl_enet_irq: enetirqgrp {

fsl,pins = <

MX6QDL_PAD_GPIO_6__ENET_IRQ 0x000b1

>;

};

Regards

imx6q linux 6.1 Mickledore: ethernet fec 2188000.ethernet eth0: rcv is not +last

imx6q linux 6.1 Mickledore: ethernet fec 2188000.ethernet eth0: rcv is not +last

i.MX6Quad