[arch-releng] ArchIso bootloader

[Gerardo Exequiel Pozzi]

On 10/11/19 12:42 PM, александр епанешников via arch-releng wrote:
>
> thanks for answers.
> 
>> One for USB EFI boot, the other for the vintage DVD/CD mode in EFI ("El
>> Torito")
> 
> 
> wear i can read about Torito? because now i don't understand fully "how
> boot segment of archiso built?"
> 
> 

For traditional bios firmware, this is done "magically" by these lines:

-eltorito-boot isolinux/isolinux.bin
-eltorito-catalog isolinux/boot.cat
-no-emul-boot -boot-load-size 4 -boot-info-table

and for efi firmware with (at last)

-eltorito-alt-boot
-e EFI/archiso/efiboot.img
-no-emul-boot
-isohybrid-gpt-basdat"

in mkarchiso

this requires more work, because efiboot.img must be prepared this is
just a vfat fs inside (done at build.sh)


> 
> 
> 
> 11.10.2019 17:28, Gerardo Exequiel Pozzi via arch-releng пишет:
>> On 10/6/19 2:38 PM, Alexandr Epaneshnikov via arch-releng wrote:
>>> hello. since i work on #63166
>>> <https://bugs.archlinux.org/task/63166?project=6>i have sum questions
>>> about archiso project.
>>>
>>> As far as I understand, two loaders are used. syslinux for bios and
>>> systemd-boot for efi. is it so? and why it is so?
> 
>> * because systemd-boot does not support non-efi
>> * syslinux may not work on efi (at least it does for few machines I
> tested).
>> * systemd-boot is the... maybe bring most features to systemd...
>>>
>>> i modified syslinux config
>>>
> <https://github.com/alex19EP/talkingarch/raw/accessible-upstreem/configs/releng/syslinux/archiso_sys.cfg>
>>> to add another entry with kernel cmdline options. do i need to add
>>> another file in configs/releng/efiboot/loader/entries for efi support?
>>>
> 
>> yes
> 
>>> why are archiso-x86_64-cd.conf and archiso-x86_64-usb.conf?
> 
>> One for USB EFI boot, the other for the vintage DVD/CD mode in EFI ("El
>> Torito")
>>>
>>>
>>> thanks.
>>>
> 
> 
>


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