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* [meta-ti][master/wrynose][PATCH v4] initramfs: Add initramfs-module-netsetup recipe for NFS boot
@ 2026-06-08  8:09 Moteen Shah
  2026-06-08  8:28 ` PRC Automation
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Moteen Shah @ 2026-06-08  8:09 UTC (permalink / raw)
  To: meta-ti
  Cc: reatmon, nm, u-kumar1, s-vadapalli, a-limaye, m-shah,
	gehariprasath, denys, jcormier

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
- 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



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Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-06-08  8:09 [meta-ti][master/wrynose][PATCH v4] initramfs: Add initramfs-module-netsetup recipe for NFS boot Moteen Shah
2026-06-08  8:28 ` PRC Automation
2026-06-08 13:50 ` Jon Cormier
2026-06-11 14:45 ` Denys Dmytriyenko

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