UEFI platforms with a Devicetree have recently gained support for some form
of network booting. [1][2]
On those platforms, the UEFI firmware downloads the disk image over the
network and presents it to UEFI applications using the simple filesystem
protocol. This is sufficient for OS loaders such as e.g. GRUB to find their
configuration and load the kernel image.
The firmware must also describe the ramdisk to the OS, so that it finds its
root filesystem. On ACPI based platforms this is done with an NVDIMM
Firmware Interface Table (NFIT). On Devicetree based platforms, this can be
done with a pmem node. [3]
Add a kernel config fragment to add pmem support, which enables network
boot on UEFI platforms with Devicetree.
Also, briefly mention that we support this scenario in the readme.
This can be tested on Qemu, with the following procedure:
Build aarch64_efi_defconfig in a folder, to obtain output/images/disk.img,
and serve the image over HTTP with python:
$ python -m http.server -d output/images/
In another terminal and another folder, configure a U-Boot based firmware
starting from qemu_aarch64_ebbr_defconfig, and with the following
additional configurations:
BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2026.04"
BR2_TARGET_UBOOT_NEEDS_DTC=y
Add the following U-Boot configurations to
board/qemu/aarch64-ebbr/u-boot.fragment:
CONFIG_EFI_HTTP_BOOT=y
CONFIG_NET_LWIP=y
Build everything; you should obtain output/images/flash.bin.
Start Qemu as per board/qemu/aarch64-ebbr/readme.txt, but omitting the hd0
-device and -drive stanzas.
U-Boot should start; interrupt it with enter.
At U-Boot prompt, type the following commands:
=> setenv loadaddr 0x43000000
=> efidebug boot rm 0
=> efidebug boot add -u 0 net http://10.0.2.2:8000/disk.img
=> efidebug boot order 0
=> bootefi bootmgr
U-Boot should download the disk image over HTTP and boot Linux with UEFI.
Look for the following message in Linux boot log, to confirm that it did
indeed mount its rootfs from the downloaded image:
EXT4-fs (pmem0p2): mounted filesystem ...
Link: https://www.linaro.org/blog/installing-fedora-with-uefi-http-boot/ [1]
Link: https://docs.u-boot-project.org/en/latest/develop/uefi/uefi.html#uefi-http-boot-using-the-legacy-tcp-stack [2]
Link: https://github.com/ARM-software/edge-iot-arch-guide/blob/main/source/http-boot/pmem_node.md [3]
Signed-off-by: Vincent Stehlé <vincent.stehle@arm.com>
Cc: Dick Olsson <hi@senzilla.io>
Signed-off-by: Julien Olivain <ju.o@free.fr>
This commit switches the aarch64_efi_defconfig to an external glibc
stable Bootlin toolchain, to follow recommendation from [1].
Since an external toolchain is used, the linux-headers.hash custom
hash file is no longer needed and is removed.
[1] https://elinux.org/Buildroot:DeveloperDaysELCE2024#Rules_for_defconfigs
Signed-off-by: Julien Olivain <ju.o@free.fr>
While at it:
- Turn on hashes verification and add a hash for the Linux kernel.
- Linux kernel needs host-python3; add it.
- Convert to `make savedefconfig' format.
- Fix shellcheck warnings in our post-image script and update
.checkpackageignore.
Signed-off-by: Vincent Stehlé <vincent.stehle@arm.com>
Cc: Erico Nunes <nunes.erico@gmail.com>
Cc: Dick Olsson <hi@senzilla.io>
Cc: Julien Olivain <ju.o@free.fr>
Reviewed-by: Julien Olivain <ju.o@free.fr>
[Julien: rebased the patch to resolve conflicts with commit
edc0a6b1a "configs: regenerate all defconfigs"]
Signed-off-by: Julien Olivain <ju.o@free.fr>
This commit changes to use partition-type-uuid = U instead of
c12a7328-f81f-11d2-ba4b-00a0c93ec93b where relevant for the EFI System
Partition.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Genimage 15 deprecated the gpt option and now prints a warning when it is
used:
INFO: hdimage(sdcard.img): The option 'gpt' is deprecated. Use 'partition-table-type' instead
So change the genimage configuration files to use that instead.
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Bump Linux kernel version to 5.15.4.
We enlarge the boot partition to follow the kernel image size increase and
update the documentation.
Signed-off-by: Vincent Stehlé <vincent.stehle@arm.com>
Reviewed-by: Dick Olsson <hi@senzilla.io>
Cc: Erico Nunes <nunes.erico@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Beatify this genimage .cfg file to have consistency with all genimage .cfg
files in Buildroot.
Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
The startup.nsh file is useless to boot EFI payloads. We just need to
follow the naming detection specified in the UEFI spec.
The EFI payload need to be placed in the boot/efi folder in the EFI partition
and follow the architecture naming as described below:
32bit : bootia32.efi
x64 : bootx64.efi
aarch32 : bootarm.efi
aarch64 : bootaa64.efi
This naming is already right in the packages involved (systemd, grub2,
gummiboot), therefore we just need to drop the generation of the
startup.nsh file.
The usage of the startup.nsh in genimage is also dropped to avoid errors in
the image generation.
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Tested-by: Erico Nunes <nunes.erico@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
- Bump kernel to version 5.11.16.
We remove the hardcoded ttyAMA0 and rely on the firmware to discover our
console. This enables serial console on systems, which do not have an Arm
pl011 UART.
We switch to GPT disklabel and discover our root filesystem using its
PARTLABEL. This enables booting from more media, such as HDD, SD card or
USB.
We update the readme, which hinted that ACPI was mandatory. This is not
strictly the case as we can also boot with a dtb and/or a U-Boot based
firmware, with no ACPI. While at it, mention EBBR, SystemReady and explain
how to build and use a U-Boot-based qemu firmware.
Signed-off-by: Vincent Stehlé <vincent.stehle@arm.com>
Cc: Erico Nunes <nunes.erico@gmail.com>
Reviewed-by: Erico Nunes <nunes.erico@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
New generic defconfig for aarch64, to run on aarch64 servers compliant
with EFI firmware and ACPI.
This can also be tested with qemu, and is useful so that we have an
arm defconfig with grub enabled. Tested with qemu 2.11.2 and AAVMF,
the aarch64 virtual machine UEFI firmware.
Signed-off-by: Erico Nunes <nunes.erico@gmail.com>
[Thomas: extend readme.txt with more details]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
