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feat(extensions): add netboot extension for TFTP+NFS diskless boot #9656

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feat(extensions): add netboot extension for TFTP+NFS diskless boot #9656

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f5f87e5
fix(config): skip check_filesystem_compatibility_on_host for ROOTFS_T…
iav Apr 11, 2026
49d57ce
fix(templates): make nfs-boot.cmd.template architecture-agnostic
iav Apr 11, 2026
71655d8
feat(rootfs-to-image): support ROOTFS_EXPORT_DIR and configurable ROO…
iav Apr 12, 2026
e8f19a1
feat(extensions): add netboot extension for full TFTP+NFS boot
iav Apr 12, 2026
551db63
feat(core): add ROOTFS_TYPE=nfs-root for full network boot
iav Apr 12, 2026
4ff6016
docs(netboot): add full netboot setup guide
iav Apr 12, 2026
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32 changes: 19 additions & 13 deletions config/templates/nfs-boot.cmd.template
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Original file line number Diff line number Diff line change
Expand Up @@ -7,27 +7,33 @@
setenv net_setup "ip=dhcp"

# for static configuration see documentation
# https://github.com/torvalds/linux/blob/master/Documentation/admin-guide/nfs/nfsroot.rst
# https://www.kernel.org/doc/Documentation/admin-guide/nfs/nfsroot.rst
# setenv net_setup "ip=<client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>:<dns0-ip>:<dns1-ip>"

# you may need to add extra kernel arguments specific to your device
setenv bootargs "console=tty1 console=ttyS0,115200 root=/dev/nfs ${net_setup} rw rootflags=noatime disp.screen0_output_mode=1920x1080p60 panic=10 consoleblank=0 enforcing=0 loglevel=6"
# No hardcoded `console=`: kernels resolve the console from the DTB's
# /chosen/stdout-path. Hardcoding a baud rate here breaks boards whose
# UART runs at non-115200 speeds (e.g. helios64 @ 1500000).
setenv bootargs "root=/dev/nfs ${net_setup} rw rootwait earlycon panic=10 loglevel=6"

if test -n ${nfs_root}; then
if test -n "${nfs_root}"; then
setenv bootargs "${bootargs} nfsroot=${nfs_root}"
fi

if ext4load mmc 0 0x00000000 .next || fatload mmc 0 0x00000000 .next; then
ext4load mmc 0 ${fdt_addr_r} /dtb/${fdtfile} || fatload mmc 0 ${fdt_addr_r} /dtb/${fdtfile}
ext4load mmc 0 ${kernel_addr_r} zImage || fatload mmc 0 ${kernel_addr_r} zImage
ext4load mmc 0 ${ramdisk_addr_r} uInitrd || fatload mmc 0 ${ramdisk_addr_r} uInitrd || setenv ramdisk_addr_r "-"
# Load kernel + DTB + initrd from the active distro boot partition.
# devtype/devnum/distro_bootpart are set by U-Boot's bootflow scanner
# before this script runs.
setenv boot_dev "${devtype} ${devnum}:${distro_bootpart}"

load ${boot_dev} ${fdt_addr_r} dtb/${fdtfile}
load ${boot_dev} ${ramdisk_addr_r} uInitrd || setenv ramdisk_addr_r "-"

# Prefer arm64 flat Image (booti); fall back to compressed zImage (bootz).
if load ${boot_dev} ${kernel_addr_r} Image; then
booti ${kernel_addr_r} ${ramdisk_addr_r} ${fdt_addr_r}
else
load ${boot_dev} ${kernel_addr_r} zImage
setenv fdt_high ffffffff
bootz ${kernel_addr_r} ${ramdisk_addr_r} ${fdt_addr_r}
else
ext4load mmc 0 ${fdt_addr_r} script.bin || fatload mmc 0 ${fdt_addr_r} script.bin
ext4load mmc 0 ${kernel_addr_r} zImage || fatload mmc 0 ${kernel_addr_r} zImage
ext4load mmc 0 ${ramdisk_addr_r} uInitrd || fatload mmc 0 ${ramdisk_addr_r} uInitrd || setenv ramdisk_addr_r "-"
bootz ${kernel_addr_r} ${ramdisk_addr_r}
fi

# Recompile with:
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