[arch-releng] [RFC] [PATCH] [configs/releng] Add UEFI boot support via linux >= 3.3 EFI boot stub on x86_64

[Gerardo Exequiel Pozzi]

This only works via EFI shell because we need to pass boot params to kernel.

An aditional EFI shell is provided with an startup script for automatic booting.

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386 at yahoo.com.ar>
---
 README                  |    3 +++
 configs/releng/build.sh |   24 ++++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/README b/README
index 57c87e3..711e51d 100644
--- a/README
+++ b/README
@@ -153,6 +153,9 @@ if nothing is specified on command line.
  + squashfs-tools          for mksquashfs
  + libisoburn              for xorriso
 
+** For configs/releng build.sh needs theses packages (build host):
+ + dosfstools              for mkfs.vfat
+
 ** For these hooks needs these packages (on target root-image)
 * archiso
  + (none)
diff --git a/configs/releng/build.sh b/configs/releng/build.sh
index 2faf210..c041953 100755
--- a/configs/releng/build.sh
+++ b/configs/releng/build.sh
@@ -58,6 +58,29 @@ make_boot() {
     fi
 }
 
+# Prepare EFI "El Torito" boot image (using Linux >= 3.3 EFI boot stub)
+make_boot_efi() {
+    if [[ ! -e ${work_dir}/build.${FUNCNAME} ]]; then
+        if [[ ${arch} == "x86_64" ]]; then
+            mkdir -p ${work_dir}/iso/EFI/archiso
+            dd of=${work_dir}/iso/EFI/archiso/efiboot.img bs=1 seek=20M count=0
+            mkfs.vfat ${work_dir}/iso/EFI/archiso/efiboot.img
+            mkdir -p ${work_dir}/efiboot
+            mount ${work_dir}/iso/EFI/archiso/efiboot.img ${work_dir}/efiboot
+            mkdir -p ${work_dir}/efiboot/EFI/archiso
+            cp ${work_dir}/iso/${install_dir}/boot/x86_64/vmlinuz ${work_dir}/efiboot/EFI/archiso/vmlinuz.efi
+            cp ${work_dir}/iso/${install_dir}/boot/x86_64/archiso.img ${work_dir}/efiboot/EFI/archiso/archiso.img
+            # Always provide an EFI shell for systems without it (most real hardware for home-end-users?).
+            mkdir -p ${work_dir}/efiboot/EFI/boot
+            wget -O ${work_dir}/efiboot/EFI/boot/bootx64.efi https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2/ShellBinPkg/UefiShell/X64/Shell.efi
+            # Added an EFI shell script for automatic boot if ESC-key is not pressed.
+            echo "\EFI\archiso\vmlinuz.efi initrd=\EFI\archiso\archiso.img archisolabel=${iso_label}" > ${work_dir}/efiboot/EFI/boot/startup.nsh
+            umount ${work_dir}/efiboot
+        fi
+        : > ${work_dir}/build.${FUNCNAME}
+    fi
+}
+
 # Prepare /${install_dir}/boot/syslinux
 make_syslinux() {
     if [[ ! -e ${work_dir}/build.${FUNCNAME} ]]; then
@@ -259,6 +282,7 @@ make_common_single() {
     make_packages
     make_setup_mkinitcpio
     make_boot
+    make_boot_efi
     make_syslinux
     make_isolinux
     make_customize_root_image
-- 
1.7.9.5