Re: [meta-ti][master/wrynose][PATCH 2/2] initramfs: Add netsetup module for DHCP network configuration

[Denys Dmytriyenko <denis@denix.org>]

On Tue, Jun 02, 2026 at 04:18:10PM +0530, Moteen Shah via lists.yoctoproject.org wrote:
> Add 83-netsetup, an initramfs-framework module that configures the
> network interface via DHCP before the NFS root mount. Needed when the
> Ethernet driver is a loadable module and the deferred probe chain
> requires time to settle after udev loads the modules. Also add dhcpcd
> to packagegroup-ti-core-initramfs to support DHCP configuration.
> 
> Signed-off-by: Moteen Shah <m-shah@ti.com>
> ---
>  .../initramfs-framework/83-netsetup           | 54 +++++++++++++++++++
>  .../initramfs-framework_%.bbappend            | 15 ++++++
>  .../packagegroup-ti-core-initramfs.bb         |  2 +
>  3 files changed, 71 insertions(+)
>  create mode 100644 meta-ti-bsp/recipes-core/initramfs-scripts/initramfs-framework/83-netsetup
>  create mode 100644 meta-ti-bsp/recipes-core/initramfs-scripts/initramfs-framework_%.bbappend
> 
> diff --git a/meta-ti-bsp/recipes-core/initramfs-scripts/initramfs-framework/83-netsetup b/meta-ti-bsp/recipes-core/initramfs-scripts/initramfs-framework/83-netsetup
> new file mode 100644
> index 00000000..b71bc3b3
> --- /dev/null
> +++ b/meta-ti-bsp/recipes-core/initramfs-scripts/initramfs-framework/83-netsetup
> @@ -0,0 +1,54 @@
> +#!/bin/sh
> +# Configure network via DHCP before NFS root mount. Polls for an Ethernet
> +# interface with sleep 1 per iteration to allow the Ethernet driver deferred
> +# probe chain to settle after udev loads the modules.
> +
> +netsetup_enabled() {
> +    [ "${bootparam_root}" = "/dev/nfs" ] || return 1
> +    return 0
> +}
> +
> +netsetup_run() {
> +    local iface timeout devtype
> +
> +    # Extract interface from ip= kernel param (format: client:server:gw:mask:host:device:autoconf)
> +    iface=""
> +    case "${bootparam_ip}" in
> +        dhcp|on|any|"")
> +            ;;
> +        *)
> +            iface=$(echo "${bootparam_ip}" | cut -d: -f6)
> +            ;;
> +    esac
> +
> +    udevadm trigger --action=add --subsystem-match=net
> +    udevadm settle --timeout=10
> +
> +    # Poll up to 60 seconds for an Ethernet interface (ARPHRD_ETHER = type 1).
> +    msg "netsetup: waiting for ethernet interface..."
> +    timeout=60
> +    while [ "${timeout}" -gt 0 ]; do
> +        if [ -n "${iface}" ] && [ -d "/sys/class/net/${iface}" ]; then
> +            break
> +        fi
> +        for dev in /sys/class/net/*; do
> +            [ -f "${dev}/type" ] || continue
> +            devtype=$(cat "${dev}/type")
> +            [ "${devtype}" = "1" ] || continue
> +            iface=$(basename "${dev}")
> +            break
> +        done
> +        [ -n "${iface}" ] && [ -d "/sys/class/net/${iface}" ] && break
> +        sleep 1
> +        timeout=$((timeout - 1))
> +    done
> +
> +    if [ -z "${iface}" ] || [ ! -d "/sys/class/net/${iface}" ]; then
> +        msg "netsetup: no ethernet interface found after 60s, skipping DHCP"
> +        return
> +    fi
> +
> +    msg "netsetup: configuring ${iface} via DHCP"
> +
> +    dhcpcd --waitip "${iface}"
> +}
> diff --git a/meta-ti-bsp/recipes-core/initramfs-scripts/initramfs-framework_%.bbappend b/meta-ti-bsp/recipes-core/initramfs-scripts/initramfs-framework_%.bbappend
> new file mode 100644
> index 00000000..c8955689
> --- /dev/null
> +++ b/meta-ti-bsp/recipes-core/initramfs-scripts/initramfs-framework_%.bbappend
> @@ -0,0 +1,15 @@
> +FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"
> +
> +SUMMARY:initramfs-module-netsetup = "initramfs support for DHCP network setup before NFS root mount"

This should probably be a standalone initramfs-module* recipe, instead of a 
bbappend.


> +SRC_URI:append = " file://83-netsetup"
> +
> +PACKAGES =+ "initramfs-module-netsetup"
> +
> +RDEPENDS:initramfs-module-netsetup = "${PN}-base"
> +
> +FILES:initramfs-module-netsetup = "/init.d/83-netsetup"
> +
> +do_install:append() {
> +    install -m 0755 ${UNPACKDIR}/83-netsetup ${D}/init.d/83-netsetup
> +}
> diff --git a/meta-ti-bsp/recipes-ti/initramfs/packagegroup-ti-core-initramfs.bb b/meta-ti-bsp/recipes-ti/initramfs/packagegroup-ti-core-initramfs.bb
> index a9eff847..ede0639d 100644
> --- a/meta-ti-bsp/recipes-ti/initramfs/packagegroup-ti-core-initramfs.bb
> +++ b/meta-ti-bsp/recipes-ti/initramfs/packagegroup-ti-core-initramfs.bb
> @@ -18,6 +18,8 @@ RDEPENDS:${PN} += "\
>      netbase \
>      base-files \
>      base-passwd \
> +    dhcpcd \
> +    initramfs-module-netsetup \
>      initramfs-framework-base \
>      initramfs-module-udev \
>      initramfs-module-nfsrootfs \
> -- 
> 2.34.1