Low-Mem devices: zram-swap does not work anymore

[Noki]

Low memory devices should load zram-swap:

bbb-configs/roles/cfg_openwrt/tasks/conditional_packages.yml

Lines 36 to 41 in 5069887

	- name: "Add zram-swap on low mem and big flash"
	set_fact:
	packages: "{{ packages + ['zram-swap'] }}"
	when:
	- low_mem | default(false)
	- not (low_flash | default(false))

This however results in the following error:

Thu Oct 24 00:51:16 2024 daemon.crit zram_start: kernel doesn't support swap
Thu Oct 24 00:51:16 2024 daemon.notice procd: /etc/rc.d/S15zram: zram_start: kernel doesn't support swap

We should either stop loading zram-swap or make the kernel support it.

[spolack]

Seems swap is not compiled in on OpenWRTs SMALL_FLASH devices.
https://github.com/openwrt/openwrt/blob/main/config/Config-kernel.in#L27-L29

Our issue seems also related to openwrt/openwrt#15951

[spolack]

I'd propose to either not install zram-swap on small_flash devices, which boils down to the ath79-tiny targets, another alternative would be to get a fix upstream. IMO saving ram is more important than saving a few bytes in the flash.

./model_ubnt_bullet_m2_ar7241.yml:target: ath79/tiny
./model_ubnt_bullet_m5_ar7241.yml:target: ath79/tiny
./model_ubnt_nanostation_loco_m2_xm.yml:target: ath79/tiny
./model_ubnt_nanostation_loco_m5_xm.yml:target: ath79/tiny
./model_ubnt_nanostation_loco_m5_xw.yml:target: ath79/tiny
./model_ubnt_nanostation_m2_xm.yml:target: ath79/tiny
./model_ubnt_nanostation_m5_xm.yml:target: ath79/tiny