Some PinePhone installs with a small /boot partition might experience a failure when mkinitfs runs on upgrade:
==> Installing: /boot/initramfs
==> Installing: /boot/vmlinuz
==> Installing: /boot/initramfs-extra
==> Installing: /boot/sun50i-a64-pinephone-1.1.dtb
*NOT* copying file atomically (not enough free space at target): /tmp/mkinitfs402660607/allwinner/sun50i-a64-pinephone-1.1.dtb
==> Installing: /boot/sun50i-a64-pinephone-1.2.dtb
*NOT* copying file atomically (not enough free space at target): /tmp/mkinitfs402660607/allwinner/sun50i-a64-pinephone-1.2.dtb
==> Installing: /boot/uImage
*NOT* copying file atomically (not enough free space at target): /tmp/mkinitfs402660607/uImage
cp: write error: No space left on device
Previous versions of the PinePhone's device package in pmaports built/installed a u-boot legacy kernel and initramfs image to /boot. This was removed in pma!2449, however the old uImage and uInitrd files were not cleaned up in /boot, causing mkintifs to fail when there is no more free space.
If your apk upgrade output looks like that above, where mkinitfs was copying a uImage file, make sure that /etc/deviceinfo is unmodified from what the device-pine64-pinephone package installs.
A proper fix is being developed, but in the meantime the following workaround should recover things:
$ sudo rm /boot/uImage*
$ sudo rm /boot/uInitrd*
$ sudo apk fix -r
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