Error during mkbootimg part of pmbootstrap install

So I am trying to port postmarketos, I have gotten very far (everything has compiled) but there is an issue during pmbootstrap install

Before you ask I have asked Matrix/IRC

I noticed my SoC has mainline support so I'm mainlining it

Phone specs:

• Samsung Galaxy A127F
• Exynos 850 SoC
• stock bootloader

Logs:

• pmbootstrap zap; pmbootstrap -v install
  • shortened
  • full

Files used:

• device-samsung-a12
  • deviceinfo
  • APKBUILD
• linux-samsung-a12
  • APKBUILD
  • config-samsung-a12.aarch64
  • enable_HAVE_KERNEL_GZIP.patch

What I think is happening:

• mkbootimg is failing for some reason

What I think can fix it:

• Disabling it. This wiki page says:

  " generate_bootimg | Set this to true for fastboot device, so the mkinitfs command will generate a boot.img file after creating the initfs. Add mkbootimg as dependency to your device's APKBUILD! "

  I don't know if a phone using samsungs download mode counts as a "fastboot device" I have tried disabling it but heimdall then stopped at 6% I followed the advice of the wiki but then heimdall got stuck at 27%

• Adding more arguments. The error is error: not enough arguments '/tmp/mkinitfs1981624154/boot.img' so just add the arguments? The problem is I don't know which ones. According to the wiki I could use bootimg_custom_args to add custom arguments, but which custom arguments? And where are the files arguments like --kernel should point to?

Please remind me if I forgot to mention anything and I will happily edit my post :D

Edit: I would just like to say thanks to everyone who has helped me on previous issues and anyone who helps me on any other issue (including this one)