LayerscapeのトピックLX2160A-RDB - Uboot not conveying the MAC address to Linux

LX2160A-RDB - Uboot not conveying the MAC address to Linux

csr202 — Fri, 08 Sep 2023 15:05:47 GMT

I'm trying to configure custom ethernet mac addresses from u-boot and convey it to Linux on LX2160A-RDB based custom hw. I could configure the mac addresses on u-boot using "mac" command. However, Linux eth interfaces still shows random mac addresses. Please find the details below.

As per my understanding, u-boot provides “mac” command to configure eth mac addresses for DPAA2 (fsl-mc). “mac” command store this mac configuration in EEPROM. after configuring mac, uboot updates ethaddr/ethXaddr environment variable.

u-boot then loads Linux device tree and before passing it to the kernel, it calls fdt_fixup_ethernet(blob) api to updates "mac-address" and "local-mac-address" fields with ethaddr/ethXaddr mac entries in Linux device tree for dpmac nodes.

DPL device tree contains dpmac configurations. Do we also need "mac_addr" field in DPL for dpni nodes?

On Linux side, It still uses random mac addresses for eth interfaces. Does fsl-dpaa2-mac/fsl-dpaa2-eth driver uses "mac-address" field from dpmac node from Linux device tree?

Is there any additional configuration required for Linux to uses mac addresses passed from uboot?

From u-boot console:

eth0: DPMAC3@10gbase-r, eth1: DPMAC4@10gbase-r, eth2: DPMAC5@10gbase-r, eth3: DPMAC6@10gbase-r

=> mac
ID: NXID v1
SN: blbx3-63
Errata: na
Eth0: 00:04:9f:04:68:b1
Eth1: 00:04:9f:04:68:b2
Eth2: 00:04:9f:04:68:b3
Eth3: 00:04:9f:04:68:b4

=> printenv
ethaddr=00:04:9F:04:68:B1
eth1addr=00:04:9F:04:68:B2
eth2addr=00:04:9F:04:68:B3
eth3addr=00:04:9F:04:68:B4

Linux device tree configuration:

aliases {
ethernet0 = &dpmac3;
ethernet1 = &dpmac4;
ethernet2 = &dpmac5;
ethernet3 = &dpmac6;
};

&dpmac3 {
status = "okay";
phy-connection-type = "10gbase-r";
mac-address = [00 00 00 00 00 00];
};

&dpmac4 {
status = "okay";
phy-connection-type = "10gbase-r";
mac-address = [00 00 00 00 00 00];
};

&dpmac5 {
status = "okay";
phy-connection-type = "10gbase-r";
mac-address = [00 00 00 00 00 00];
};

&dpmac6 {
status = "okay";
phy-connection-type = "10gbase-r";
mac-address = [00 00 00 00 00 00];
};

Linux console:

root@blackcomb-rev1:~# ip link
4: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000
link/ether a2:04:30:ae:34:99 <= Random mac address
5: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000
link/ether 12:9b:71:f2:aa:b7 <= Random mac address
6: eth3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000
link/ether 82:12:40:b9:3e:78 <= Random mac address
7: eth4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000
link/ether 26:59:9f:47:61:a6 <= Random mac address

Re: LX2160A-RDB - Uboot not conveying the MAC address to Linux

JosephAtNXP — Fri, 08 Sep 2023 19:52:31 GMT

Hi,

Thank you for your interest in NXP Semiconductor products,

You have enabled FDT_SEQ_MACADDR_FROM_ENV in your configs?

Regards

Re: LX2160A-RDB - Uboot not conveying the MAC address to Linux

csr202 — Fri, 08 Sep 2023 20:49:11 GMT

Thanks Joseph.
I tried defining FDT_SEQ_MACADDR_FROM_ENV in u-boot config header. It didn't make any difference, I still see the random mac addresses on Linux eth interfaces.

From u-boot it does update mac entries in device tree before passing it to Linux.
Loading Device Tree to 000000009eff4000, end 000000009efff7bd ... OK
Updating property '/soc/fsl-mc@80c000000/dpmacs/ethernet@3/mac-address' = 00 04 9f 04 68 b1
Updating property '/soc/fsl-mc@80c000000/dpmacs/ethernet@3/local-mac-address' = 00 04 9f 04 68 b1
Updating property '/soc/fsl-mc@80c000000/dpmacs/ethernet@4/mac-address' = 00 04 9f 04 68 b2
Updating property '/soc/fsl-mc@80c000000/dpmacs/ethernet@4/local-mac-address' = 00 04 9f 04 68 b2
Updating property '/soc/fsl-mc@80c000000/dpmacs/ethernet@5/mac-address' = 00 04 9f 04 68 b3
Updating property '/soc/fsl-mc@80c000000/dpmacs/ethernet@5/local-mac-address' = 00 04 9f 04 68 b3
Updating property '/soc/fsl-mc@80c000000/dpmacs/ethernet@6/mac-address' = 00 04 9f 04 68 b4
Updating property '/soc/fsl-mc@80c000000/dpmacs/ethernet@6/local-mac-address' = 00 04 9f 04 68 b4

Re: LX2160A-RDB - Uboot not conveying the MAC address to Linux

JosephAtNXP — Wed, 13 Sep 2023 00:59:51 GMT

Hi,

I understand, by the time you tried with FDT...CONFIG you hadn't any MAC addresses in DTS, right? I saw that you tried in DTS set them to a different value.

Also, it'd worth trying to remove this property from defconfig

Regards,