[PATCH 0/2] Add EFI HTTP boot support

Masahisa Kojima masahisa.kojima at linaro.org
Wed Aug 23 10:37:18 CEST 2023

This series adds the EFI HTTP boot support.
User can add the URI device path with "efidebug boot add" command.
efibootmgr handles the URI device path, download the
specified file using wget, mount the downloaded image with
blkmap, then boot with the default file(e.g. EFI/BOOT/BOOTAA64.EFI).

To enable EFI HTTP boot, we need to enable the following Kconfig options.

On the Socionext Developerbox, enter the following commands then
debian installer is downloaded into "loadaddr" and installer
automatically starts.
 => dhcp
 => setenv serverip
 => efidebug boot add -u 3 debian-netinst http://ftp.riken.jp/Linux/debian/debian-cd/12.1.0/arm64/iso-cd/debian-12.1.0-arm64-netinst.iso
 => efidebug boot order 3
 => bootefi bootmgr

Note that this debian installer can not proceed the installation
bacause RAM disk of installer image is not recogniged by the kernel.
I'm still investigating this issue, but drivers/nvdimm/of_pmem.c in linux
will be one of the solution to recognize RAM disk from kernel.
(In EDK2, the equivalent solution is called ACPI NFIT.)

On QEMU, I can not make DNS work from the QEMU guest.
The following commands work on qemu_arm64(manually set the http server ip in URI).
  => dhcp
  => setenv gatewayip
  => setenv httpserverip
  => efidebug boot add -u 3 debian-netinst
  => efidebug boot order 3
  => bootefi bootmgr

Masahisa Kojima (2):
  cmd: efidebug: add uri device path
  efi_loader: support boot from URI device path

 cmd/efidebug.c               |  39 +++++++
 lib/efi_loader/efi_bootmgr.c | 213 +++++++++++++++++++++++++++++++++++
 2 files changed, 252 insertions(+)

base-commit: 4e73b0153cce064e10dee4722cb2b6833361c227

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