[Buildroot] UEFI and systemD

[Arnout Vandecappelle <arnout@mind.be>]

On 12/10/18 10:45, lpdev at cordier.org wrote:
> Hi everybody,
> 
> I finally succeed to compile and start a linux kernel using EFI. My kernel is
> booting, but it seems that systemd is not starting. (I only get output from the
> kernel, and when I plugin/plugoff devices). I have no tty for interacting with
> the operating system.
> 
> After digging in systemd.mk, I noticed that in SYSTEMD_CONF_OPTS, 2 options are
> disabled:
> 
> ??? -Defi=false \
> ??? -Dgnu-efi=false \
> 
> Is it normal? Any clue to how to make systemd boot while using Uefi?

 Try setting those options to true and see if it helps...

 The -Defi=false option has been there since the option was introduced in the
bump from 44 to 207. Probably just not something considered relevant at the time.

 The -Dgnu-efi=false was introduced in ac0a31090ad44531fd14a3e3b1bb7e23c1577f68
with the following explanation:

    - Add --disable-gnuefi to configure options to avoid a failure like this
      one:

      checking for /usr/lib/gnuefi/elf_ia32_efi.lds... configure: error:
      cannot check for file existence when cross compiling

 With the switch to meson, that's probably not relevant anymore and it should
instead become something like this:

ifeq ($(BR2_PACKAGE_GNU_EFI),y)
SYSTEMD_DEPENDENCIES += gnu-efi
SYSTEMD_CONF_OPTS += -Dgnu-efi=true
else
SYSTEMD_CONF_OPTS += -Dgnu-efi=false
endif


 If you do get success with these changes, could you send two patches to
Buildroot? The first one to enable the optional gnu-efi dependency, the second
one to enable efi when appropriate. For the latter, of course, you should first
find out when it is appropriate to enable efi.


 Regards,
 Arnout

[snip]
-- 
Arnout Vandecappelle                          arnout at mind be
Senior Embedded Software Architect            +32-16-286500
Essensium/Mind                                http://www.mind.be
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