[meta-ti][master/wrynose][PATCH v5] initramfs: Add initramfs-module-netsetup recipe for NFS boot

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 <[email protected]>
---
Changes in v5:
- Scope CPSW modules and netsetup inclusion to :k3:bsp-next to avoid
  breaking legacy non-K3 platforms building with bsp-next (Denys)
- Restore PACKAGE_ARCH = "${MACHINE_ARCH}" since recipe has
  K3-specific RDEPENDS (Denys)

 .../initramfs-module-netsetup/83-netsetup     | 54 +++++++++++++++++++
 .../initramfs-module-netsetup_1.0.bb          | 32 +++++++++++
 .../packagegroup-ti-core-initramfs.bb         |  2 +
 3 files changed, 88 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..03925497
--- /dev/null
+++ b/meta-ti-bsp/recipes-ti/initramfs/initramfs-module-netsetup_1.0.bb
@@ -0,0 +1,32 @@
+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:k3: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 \
+"
+
+PACKAGE_ARCH = "${MACHINE_ARCH}"
diff --git a/meta-ti-bsp/recipes-ti/initramfs/packagegroup-ti-core-initramfs.bb b/meta-ti-bsp/recipes-ti/initramfs/packagegroup-ti-core-initramfs.bb
index a9eff847..537d1f5a 100644
--- a/meta-ti-bsp/recipes-ti/initramfs/packagegroup-ti-core-initramfs.bb
+++ b/meta-ti-bsp/recipes-ti/initramfs/packagegroup-ti-core-initramfs.bb
@@ -23,3 +23,5 @@ RDEPENDS:${PN} += "\
     initramfs-module-nfsrootfs \
     nfs-utils-mount \
 "
+
+RDEPENDS:${PN}:append:k3:bsp-next = " initramfs-module-netsetup"
-- 
2.34.1