The MAC addresses get fixed in the device tree for "ethernet" nodes is by using trailing number behind "ethernet" found in "/aliases". It may not be necessary for the "ethernet" nodes to be sequential. There can be gaps in between or any ethenet node disabled.
Reason for gaps is because the available ethernet port are based on SerDes protocol chosen for the SoC. Usually Linux device tree contains "ethernet" node for all possible ports supported by SoC for e.g. LS1046A. Where based on SerDes protocol some "ethernet" ports are unavailable hence non-sequential.
This patch-set provide way to fetch MAC addr sequentially from env variables and also create hole in "ethernet" node (disable) based on SerDes protocol for LS1046ARDB.
This patch-set provide a support to fetch MAC addr sequentially from env and apply them to "ethernet" nodes in the order they appear in device tree only if "ethernet" is not "disabled"
It also disables "ethernet" nodes in device tree based ethernet port availability in the selected SerDes protocol. Currently the changes are done foe LS1046A. This has been added as a compile time option for now, to keep backward compatibility.
The associated documentation is also updated in the README.
Other platforms should also follow same approach.
Prabhakar Kushwaha (3): common: Fix-up MAC addr in dts by fetching env variable serially arm: Add support of updating dts before fix-up boards: ls1046ardb: disable unavailable "ethernet" node in dts
README | 9 +++++++ arch/arm/lib/bootm-fdt.c | 12 ++++++++++ board/freescale/ls1046ardb/eth.c | 51 ++++++++++++++++++++++++++++++++++++++++ common/fdt_support.c | 25 ++++++++++++++++---- include/configs/ls1046ardb.h | 2 ++ include/fdt_support.h | 3 +++ 6 files changed, 98 insertions(+), 4 deletions(-)