AM6411: Redundancy broken under Linux depending on init order

Hello Ferenc,

The Linux SDK docs that I linked provides a specific sequence of steps to enable switch mode. What you are observing is the expected behavior. Please follow the documented initialization steps:

https://software-dl.ti.com/processor-sdk-linux/esd/AM64X/latest/exports/docs/linux/Foundational_Components/PRU-ICSS/Linux_Drivers/PRU_ICSSG_Ethernet_Switch.html

By default, interfaces come up in Dual independent EMAC mode and can be changed to operate in Switch mode at runtime. Note that changing from Dual EMAC to Switch mode needs loading of different firmwares to various PRU cores and thus have to follow specific sequence as shown in below sections:

3.6.3.4.1. Enabling Switch mode

Example assuming ETH1 and ETH2 as ICSSG0 interfaces:

ip link add name br0 type bridge
ip link set dev eth1 master br0
ip link set dev eth2 master br0
ip link set dev br0 up
bridge vlan add dev br0 vid 1 pvid untagged self

3.6.3.4.2. Going back to Dual EMAC mode

ip link set dev br0 down
ip link set dev eth1 nomaster
ip link set dev eth2 nomaster
ip link del name br0 type bridge

Regards,

Nick