AM6548: Passing PRU MAC ID from uboot

sarfaraz shaikh

Part Number: AM6548

Hi,

We are passing the MAC ID from u-boot to pru ethernet in linux on SDK 7.1.17 .

we are using eth1addr,eth2addr,eth3addr and eth4addr for passing the 4 MAC id for our 4 pru ethernets. below are the values.

eth1addr=aa:0a:bb:0b:ab:aa
eth2addr=aa:0a:bb:0b:ab:ab
eth3addr=aa:0a:bb:0b:ab:ac
eth4addr=aa:0a:bb:0b:ab:ad

But when the linux boots up we see that the MAC IDs are assigned in distorted order like the pair should be eth1 < - > eth1addr and so on but we can see that eth3 is getting eth1addr address and so on,

It is on our custom filesystem that we have created.

How can I change the mapping during boot time so that correct ethaddr is mapped to correct eth in Linux.

Below is the Linux ifconfig logs.

eth1 Link encap:Ethernet HWaddr AA:0A:BB:0B:AB:AC
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)

eth2 Link encap:Ethernet HWaddr AA:0A:BB:0B:AB:AD
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)

eth3 Link encap:Ethernet HWaddr AA:0A:BB:0B:AB:AA
inet addr:10.130.178.163 Bcast:10.130.179.255 Mask:255.255.254.0
inet6 addr: fe80::a80a:bbff:fe0b:abaa/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:470 errors:0 dropped:0 overruns:0 frame:0
TX packets:77 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:44864 (43.8 KiB) TX bytes:6754 (6.5 KiB)

eth4 Link encap:Ethernet HWaddr AA:0A:BB:0B:AB:AB
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)

over 4 years ago

0 sarfaraz shaikh over 4 years ago

Expert 1536 points

In this case ICSSG2-PRU0 is starting first then ICSSG2-PRU1 and then ICSSG1-PRU0 and then ICSSG1-PRU0. Can we schedule this sequence as we want.

0 sarfaraz shaikh over 4 years ago

Expert 1536 points

Hi TI ,

Any update on this thread ?

0 Vineet Roy over 4 years ago

TI__Mastermind 37435 points

Hi Sarfaraz,

Sorry for the delay, I will take a look at it and get back by tomorrow.

Regards

Vineet

0 sarfaraz shaikh over 4 years ago in reply to Vineet Roy

Expert 1536 points

Hi Vineet any update on this issue.

0 sarfaraz shaikh over 4 years ago in reply to sarfaraz shaikh

Expert 1536 points

Hi Vineet any update on this issue.

0 Vineet Roy over 4 years ago in reply to sarfaraz shaikh

TI__Mastermind 37435 points

Hi Sarfaraz,

Apologies for the delay in responding.

You will need modifications in uboot, I will get the changes. The mapping is static though as you must have figured out.

eth1addr - eth5

eth2addr - eth6

eth3addr - eth3

eth4addr - eth4

eth5addr - eth1

eth6addr - eth2

Regards

Vineet

0 sarfaraz shaikh over 4 years ago in reply to Vineet Roy

Expert 1536 points

Thanks Vineet, we will wait for the changes in uboot for the static mapping as in our case the mapping changes from 1 board to other, we will test the same scenarios once you share the uboot changes.

Thanks,

Sarfaraz

0 sarfaraz shaikh over 4 years ago in reply to sarfaraz shaikh

Expert 1536 points

Hi Vineet any update on this.

0 Vineet Roy over 4 years ago in reply to sarfaraz shaikh

TI__Mastermind 37435 points

Hi Sarfaraz,

The names of eth interfaces in Linux are controlled by the aliases in k3-am654-base-board.dts and k3-am654-idk.dtso in linux/arch/arm64/boot/dts/ti folder

In k3-am654-base-board.dts you will see two PRU ports corresponding to PRUSS2 MII0 and PRUSS2 MII1 in the SOC. The other four belong to the ICSS extension card and correspond to PRUSS0 and PRUSS1 MII0 and MII1

The aliases ethernetX (where X ranges from 1-6) in both these DTS files correspond 1:1 to the ethX interfaces you see when you execute ifconfig on Linux.
So ethernet1 corresponds to eth1, ethernet2 to eth2 and so on.

The ethXaddr uboot env variable has the following map to pruss interfaces

eth1addr - pruss1_mii0
eth2addr - pruss1_mii1
eth3addr - pruss0_mii0
eth4addr - pruss0_mii1
eth5addr - pruss2_mii0 (emac0 in DTS file)
eth5addr - pruss2_mii1 (emac1 in DTS file)

So to get a desired mapping between ethXaddr uboot variable and ethX interface in Linux you need to change the alias mapping in the two files mentioned above

The attached DTS patch will get you a 1:1 mapping between the two.

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/791/am65_5F00_eth_5F00_mapping.patch

To compile and apply it, you can use the following commands at the root of Linux SDK

make linux-dtbs

make linux-dtbs_install

For installing, you need to edit the file <SDK_INSTALL_DIR>/Rules.make and point the variable DESTDIR to rootfs of your mounted SD card.

Regards
Vineet

0 Vineet Roy over 4 years ago in reply to Vineet Roy

TI__Mastermind 37435 points

Correction to my earlier statement, changes are in Linux, not uboot

Regards

Vineet

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AM6548: Passing PRU MAC ID from uboot