linux-firmware: enable compression by default

At this moment firmware compression is disabled by default and device
types that need it must enable it in the device repos.

This patch flips the logic - we want firmware compression enabled
by default and only opt-out on devices whose kernel doesn't support it.

Change-type: patch
Signed-off-by: Michal Toman <[email protected]>

Author: mtoman

meta-balena-common/classes/balena-bootloader.bbclass

@@ -599,9 +599,9 @@ python do_kernel_resin_checkconfig() {
     configfilepath = d.getVar("B", True) + '/.config'
     allSetKernelConfigs = getKernelSetConfigs(configfilepath)
     configs = d.getVarFlags("BALENA_CONFIGS") or {}
-    firmware_compression = d.getVar('FIRMWARE_COMPRESSION', True)
+    firmware_compression = d.getVar('FIRMWARE_COMPRESSION', 'xz')
 
-    if firmware_compression == "1" and \
+    if firmware_compression in ['xz', 'zst'] and \
         'firmware_compress' not in activatedflags:
             bb.fatal("Firmware compression is enabled for this device but" \
                 " the kernel does not have support for it")

meta-balena-common/classes/kernel-balena.bbclass

@@ -1066,7 +1066,7 @@ python do_kernel_resin_checkconfig() {
     configfilepath = d.getVar("B", True) + '/.config'
     allSetKernelConfigs = getKernelSetConfigs(configfilepath)
     configs = d.getVarFlags("BALENA_CONFIGS") or {}
-    firmware_compression = d.getVar('FIRMWARE_COMPRESSION', True)
+    firmware_compression = d.getVar('FIRMWARE_COMPRESSION', 'xz')
 
     if firmware_compression in ['xz', 'zst'] and \
         'firmware_compress' not in activatedflags:

meta-balena-common/conf/distro/include/balena-os.inc

@@ -128,7 +128,7 @@ GOVERSION = "1.17.13"
 PREFERRED_PROVIDER_go-native = "go-native"
 
 # Firmware compression support
-FIRMWARE_COMPRESSION ?= ""
+FIRMWARE_COMPRESSION ?= "xz"
 
 SIGN_API ?= ""
 # Signing keys

meta-balena-common/recipes-kernel/linux-firmware/linux-firmware_20250211.bb

@@ -260,7 +260,7 @@ PACKAGECONFIG ??= ""
 PACKAGECONFIG[deduplicate] = ",,rdfind-native"
 
 # Possible values are "xz" and "zst".
-FIRMWARE_COMPRESSION ?= ""
+FIRMWARE_COMPRESSION ?= "xz"
 
 # Specifying -j requires GNU parallel, which is a part of meta-oe
 PARALLEL_MAKE = ""