Re: [meta-ti][master/wrynose][PATCH v4] initramfs: Add initramfs-module-netsetup recipe for NFS boot

[Denys Dmytriyenko <denis@denix.org>]

On Mon, Jun 08, 2026 at 01:39:06PM +0530, Moteen Shah via lists.yoctoproject.org wrote:
> Add a standalone initramfs-module-netsetup recipe that installs
> 83-netsetup, an initramfs-framework module that configures the network
> interface via DHCP before the NFS root mount. The recipe's RDEPENDS
> pulls in CPSW and its dependencies, so the kernel modules and DHCP
> client are only included when NFS boot support is needed.
> 
> Include initramfs-module-netsetup in packagegroup-ti-core-initramfs
> gated on :bsp-next, where AM65_CPSW_NUSS became a loadable module.
> TI staging kernels (6.6/6.12/6.18) still have CPSW built-in (=y).
> 
> Signed-off-by: Moteen Shah <m-shah@ti.com>
> ---
> 
> Hello all,
> AM65_CPSW_NUSS and its dependencies changed from built-in (=y) to
> loadable modules (=m) in linux-next. This breaks NFS boot because the
> Ethernet driver is no longer available before the NFS root mount.
> 
> Add a standalone initramfs-module-netsetup recipe that waits for the
> Ethernet interface to appear after udev loads the modules and then
> configures it via DHCP before the nfsrootfs module runs. The CPSW
> kernel modules are declared as RDEPENDS:append:bsp-next of the recipe
> so they are only pulled in for bsp-next kernels and only when NFS boot
> support is needed.
> 
> Changes in v4:
> - Switch from dhcpcd to udhcpc -q (busybox, already in initramfs); 
>   -q exits after obtaining lease so no background service survives
>   switch-root (Jonathan)
> - Drop dhcpcd from RDEPENDS (Jonathan)
> 
> Changes in v3:
> - Remove FILESEXTRAPATHS:prepend - redundant in a standalone recipe (Denys)
> - Remove PACKAGE_ARCH = "${MACHINE_ARCH}" - script is not machine-specific (Denys)

> - Drop k3.inc patch; move CPSW modules into RDEPENDS:append:bsp-next of
>   the recipe, linking module inclusion to NFS boot recipe inclusion

I have 2 more comments for v3 and v4 due to this ^^^ change:

1. At least some, if not all of those CPSW-related modules are K3-specific. 
Since you moved them out of k3.inc into netsetup recipe, I suspect it will 
break for any legacy non-K3 platforms building with bsp-next.

2. And that in turn now makes netsetup recipe machine-specific, unlike 
previous revisions of your patch. Depending on how you intend to fix #1 
comment, you may need to bring back PACKAGE_ARCH = "${MACHINE_ARCH}"

-- 
Denys


> - Gate initramfs-module-netsetup on :bsp-next in packagegroup so staging
>   kernels (where CPSW is built-in =y) are unaffected
> 
> Bootlogs: https://gist.github.com/Jamm02/2d078c20f0062394b0b7d09da7ee0a57
> 
>  .../initramfs-module-netsetup/83-netsetup     | 54 +++++++++++++++++++
>  .../initramfs-module-netsetup_1.0.bb          | 30 +++++++++++
>  .../packagegroup-ti-core-initramfs.bb         |  2 +
>  3 files changed, 86 insertions(+)
>  create mode 100644 meta-ti-bsp/recipes-ti/initramfs/initramfs-module-netsetup/83-netsetup
>  create mode 100644 meta-ti-bsp/recipes-ti/initramfs/initramfs-module-netsetup_1.0.bb
> 
> diff --git a/meta-ti-bsp/recipes-ti/initramfs/initramfs-module-netsetup/83-netsetup b/meta-ti-bsp/recipes-ti/initramfs/initramfs-module-netsetup/83-netsetup
> new file mode 100644
> index 00000000..8e76bac4
> --- /dev/null
> +++ b/meta-ti-bsp/recipes-ti/initramfs/initramfs-module-netsetup/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 ${iface} via DHCP"
> +
> +    udhcpc -q -i "${iface}"
> +}
> diff --git a/meta-ti-bsp/recipes-ti/initramfs/initramfs-module-netsetup_1.0.bb b/meta-ti-bsp/recipes-ti/initramfs/initramfs-module-netsetup_1.0.bb
> new file mode 100644
> index 00000000..ec04ea9d
> --- /dev/null
> +++ b/meta-ti-bsp/recipes-ti/initramfs/initramfs-module-netsetup_1.0.bb
> @@ -0,0 +1,30 @@
> +SUMMARY = "initramfs support for DHCP network configuration before NFS root mount"
> +
> +LICENSE = "MIT"
> +LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
> +
> +SRC_URI = "file://83-netsetup"
> +
> +S = "${UNPACKDIR}"
> +
> +do_install() {
> +    install -d ${D}/init.d
> +    install -m 0755 ${UNPACKDIR}/83-netsetup ${D}/init.d/83-netsetup
> +}
> +
> +FILES:${PN} = "/init.d/83-netsetup"
> +
> +RDEPENDS:${PN} = "\
> +    initramfs-framework-base \
> +"
> +
> +RDEPENDS:${PN}:append:bsp-next = " \
> +    kernel-module-ti-am65-cpsw-nuss \
> +    kernel-module-k3-cppi-desc-pool \
> +    kernel-module-davinci-mdio \
> +    kernel-module-ti-cpsw-ale \
> +    kernel-module-ti-cpsw-sl \
> +    kernel-module-phylink \
> +    kernel-module-mdio-bitbang \
> +    kernel-module-phy-gmii-sel \
> +"
> 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..b4e6adff 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
> @@ -23,3 +23,5 @@ RDEPENDS:${PN} += "\
>      initramfs-module-nfsrootfs \
>      nfs-utils-mount \
>  "
> +
> +RDEPENDS:${PN}:append:bsp-next = " initramfs-module-netsetup"
> -- 
> 2.34.1