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rpi-cmdline: Fix being renamed of network interfaces
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Add net.ifnames=0 kernel parameter into CMDLINE and make it possible to override.

If we boot the kernel this way, the network interfaces will not be renamed. Otherwise it will be renamed.

Without parameter:

root@raspberrypi3-64:~# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute
       valid_lft forever preferred_lft forever
2: enu1u1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel qlen 1000
    link/ether b8:27:eb:d9:fd:59 brd ff:ff:ff:ff:ff:ff
3: wlxb827eb8ca80c: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
    link/ether b8:27:eb:8c:a8:0c brd ff:ff:ff:ff:ff:ff

root@raspberrypi3-64:~# journalctl | grep wlan
Feb 27 17:26:08 raspberrypi3-64 kernel: brcmfmac mmc1:0001:1 wlxb827eb8ca80c: renamed from wlan0
Feb 27 17:26:10 raspberrypi3-64 kernel[296]: [    8.711897] brcmfmac mmc1:0001:1 wlxb827eb8ca80c: renamed from wlan0

With parameter:

root@raspberrypi3-64:~# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute
       valid_lft forever preferred_lft forever
2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel qlen 1000
    link/ether b8:27:eb:d9:fd:59 brd ff:ff:ff:ff:ff:ff
3: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel qlen 1000
    link/ether b8:27:eb:8c:a8:0c brd ff:ff:ff:ff:ff:ff

Signed-off-by: alperak <[email protected]>
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@alperak @agherzan
alperak authored and agherzan committed May 28, 2024
1 parent fb03b44 commit 0f46a1d
Showing 1 changed file with 4 additions and 0 deletions.
4 changes: 4 additions & 0 deletions recipes-bsp/bootfiles/rpi-cmdline.bb
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Original file line number Diff line number Diff line change
Expand Up @@ -46,6 +46,9 @@ CMDLINE_ISOL_CPUS ?= "${@setup_isolcpus(d)}"
# if the MAC addresses are omitted, random values will be used
CMDLINE_RNDIS ?= ""

# That allows to keep the traditional network interface names
CMDLINE_IFNAMES ?= "net.ifnames=0"

CMDLINE = " \
${CMDLINE_ISOL_CPUS} \
${CMDLINE_DWC_OTG} \
Expand All @@ -57,6 +60,7 @@ CMDLINE = " \
${CMDLINE_PITFT} \
${CMDLINE_DEBUG} \
${CMDLINE_RNDIS} \
${CMDLINE_IFNAMES} \
"

do_compile() {
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