[PATCH 15/34] image: Add a new type for extlinux

[Simon Glass]

Hi Tom,

On Fri, 18 Oct 2024 at 09:17, Tom Rini <trini at konsulko.com> wrote:
>
> On Fri, Oct 18, 2024 at 08:57:02AM -0600, Simon Glass wrote:
> > Hi Tom,
> >
> > On Thu, 17 Oct 2024 at 21:14, Tom Rini <trini at konsulko.com> wrote:
> > >
> > > On Thu, Oct 17, 2024 at 05:23:54PM -0600, Simon Glass wrote:
> > >
> > > > Add an image type for the extlinux.cfg file, which U-Boot supports
> > > > reading.
> > > >
> > > > Signed-off-by: Simon Glass <sjg at chromium.org>
> > > > ---
> > > >
> > > >  boot/image.c    | 1 +
> > > >  include/image.h | 1 +
> > > >  2 files changed, 2 insertions(+)
> > > >
> > > > diff --git a/boot/image.c b/boot/image.c
> > > > index abac254e026..cf16fb7fbf7 100644
> > > > --- a/boot/image.c
> > > > +++ b/boot/image.c
> > > > @@ -183,6 +183,7 @@ static const table_entry_t uimage_type[] = {
> > > >       {       IH_TYPE_FDT_LEGACY, "fdt_legacy", "legacy Image with Flat Device Tree ", },
> > > >       {       IH_TYPE_RENESAS_SPKG, "spkgimage", "Renesas SPKG Image" },
> > > >       {       IH_TYPE_STARFIVE_SPL, "sfspl", "StarFive SPL Image" },
> > > > +     {       IH_TYPE_EXTLINUX_CFG, "extlinux_cfg", "Extlinux configuration" },
> > > >       {       -1,                 "",           "",                   },
> > > >  };
> > >
> > > This whole part of the series feels like we're abusing IH_TYPE_ far past
> > > what it's used for. Especially the command line string one. It seems
> > > like the main use is to be able to later on print something human
> > > friendly. Please try and figure out some other way to do that. Thanks.
> >
> > Yes I had the same thought, particularly with cmdline, as you say.
> >
> > The obvious alternative is to just have a string which communicates
> > the type. Then I can use IH_TYPE_INVALID, perhaps, with an extra
> > string indicating what it really is.
> >
> > But one advantage of the approach in this patch is that, for bootmeths
> > which include a cmdline, it can be identified and added as a file.
> > That includes zimage and ChromiumOS, but not EFI. It will allow me to
> > get rid of the cmdline in struct bootflow, perhaps.
>
> Yeah, this all sounds like IH_TYPE is the wrong direction to expand.
> Where you're grabbing these things from is where you might get a hint as
> to what these things are and that's where to take the store the
> knowledge for later.

They are grabbed from several places:
- extlinux comes from disk, with the extlinux bootmeth, but can also
come from 'include' files within that scripts, also pxe
- EFI apps from from disk with the EFI bootmeth
- kernel, ramdisk and fdt some from most bootmeths
- cmdline comes from extlinux (with zImage only) and ChromeOS,
probably Android but I haven't looked
- logo comes just from script so far, but I suppose UKI and FIT will
have it eventually

Can you be more specific with your suggestion? I am not seeing an
alternative right now.

Regards,
Simon