[ipxe-devel] appnote/debian_preseed instructions are wrong

[Christian Nilsson]

On Wed, 12 Aug 2020, 14:55 Etienne Champetier, <champetier.etienne at gmail.com>
wrote:

> Hi Christian,
>
> Le mer. 12 août 2020 à 14:42, Christian Nilsson <nikize at gmail.com> a
> écrit :
> >
> > On Wed, 12 Aug 2020, 13:30 Michael Brown, <mcb30 at ipxe.org> wrote:
> >>
> >> On 12/08/2020 08:50, Etienne Champetier wrote:
> >> >>> The automagical construction of CPIO archives is indeed for legacy
> BIOS
> >> >>> only.  On UEFI, we provide the kernel with a virtual filesystem from
> >> >>> which it can load arbitrary files without needing a CPIO wrapper.
> >> >
> >> > Do you have a working exemple (maybe I need a special path) ?
> >> > Does it need a recent kernel ? (I think I did my tests with CentOS 7
> kernel)
> >> > Does it need a specific ipxe compile option ?
> >>
> >> No specific iPXE compile option.  Any kernel built with CONFIG_EFI_STUB
> >> should work, which includes all current distro kernels as far as I know.
> >>
> >> Any image downloaded by iPXE will be available within the virtual
> >> filesystem using the filename as shown by "imgstat".  Linux can access
> >> these files using the initrd= kernel command-line argument.
> >>
> >> In the most simple example, something like:
> >>
> >>    #!ipxe
> >>    kernel http://boot.ipxe.org/demo/vmlinuz initrd=initrd.img
> >>    initrd http://boot.ipxe.org/demo/initrd.img
> >>    boot
> >>
> >>  From memory, the initrd= option supports a comma-separated list.  I
> >> can't immediately find documentation to support this, though.
> >>
> >> Michael
> >>
> >> If one wants to add a extra configuration file as well, the extra cpio
> header needs to be added to that file to work in efi mode.
>
> So you confirm that what is explained at
> https://ipxe.org/appnote/debian_preseed is not working anymore ?
>

It works fine in pcbios mode
For EFI it needs tweaks, and that is to add cpio header to the file in a
separate step.
Which also works in pcbios mode.

>
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