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To:Arch Linux Release Engineering From:Gerardo Exequiel Pozzi Subject:Re: [arch-releng] [RFC] [PATCH] [configs/releng] Add UEFI boot support via linux >= 3.3 EFI boot stub on x86_64 Date:Wed, 04 Apr 2012 12:21:12 -0300
 

On 04/04/2012 10:48 AM, Keshav P R wrote:
> On Mon, Apr 2, 2012 at 05:07, Gerardo Exequiel Pozzi
> <vmlinuz386@yahoo.com.ar> wrote:
>> 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@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
> You need to use
> https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2/EdkShellBinPkg/FullShell/X64/Shell_Full.efi
> as ShellBinPkg shell will work only in 2.2+ systems (most of the Arch
> Lenovo UEFI users reported ShellBinPkg Shell.efi as not working. More
> info at http://sourceforge.net/mailarchive/message.php?msg_id=28690732
> .
Technically needs 2.3+.

I thinking to EdkShellBinPkg that is based on (pre)UEFI 2.0. Looks like
there are lots of of poor/old UEFI implementation even in newer hardware
so can be more safe to provide and old shell.
This is temporary until EFI_STUB understand "linux.conf" (maybe in
Linux-3.5, since 3.4 merge window is closed without it).
Anyway I think that providing a shell with script, is much more
flexible, since you can skip it then execute vmlinuz.efi with custom
boot params if needed.

>> + # 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
> Are you sure this will work without cd'ing into fso: first? Did you
> test this in real hardware like ENV (like DUET
> http://www.rodsbooks.com/bios2uefi/index.html)
Yes, indeed I use DUET even for qemu since with OVMF has video issues
(there is no video output from Linux).
Think that when boot/bootx64.efi is executed you are currently on fs0:
;) Maybe a poor UEFI implementation fails, who know?, anyway you are
dropped to the shell, and if shell fails, this is very very bad, we can
not support broken hardware addding exceptions.

Thanks for your work on UEFI things, and thanks for the feedback.

>
>> + 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
>>


--
Gerardo Exequiel Pozzi
\cos^2\alpha + \sin^2\alpha = 1