ramips: mt7621: Edgerouter-X drop factory image

Edgerouter-X factory images have not built automatically since 19.x due
to images being over 3MB. While it was possible to build custom images
with very stripped down config, this is no longer possible with the size
increases of linux 6.1 and 6.6.

Drop code for generation of factory images, if some dev later wishes to
try custom images they can revert this commit.

Signed-off-by: Tim Lunn <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/15194
(cherry picked from commit 4d90b79704efba57ab158c47ae6936ce4c1ef185)
Link: https://github.com/openwrt/openwrt/pull/17097
Signed-off-by: Petr Štetiar <[email protected]>

target/linux/ramips/image/mt7621.mk

@@ -229,30 +229,6 @@ define Build/belkin-header
 	mv [email protected] $@
 endef
 
-define Build/ubnt-erx-factory-image
-	if [ -e $(KDIR)/tmp/$(KERNEL_INITRAMFS_IMAGE) -a "$$(stat -c%s $@)" -lt "$(KERNEL_SIZE)" ]; then \
-		echo '21001:7' > $(1).compat; \
-		$(TAR) -cf $(1) --transform='s/^.*/compat/' $(1).compat; \
-		\
-		$(TAR) -rf $(1) --transform='s/^.*/vmlinux.tmp/' $(KDIR)/tmp/$(KERNEL_INITRAMFS_IMAGE); \
-		$(MKHASH) md5 $(KDIR)/tmp/$(KERNEL_INITRAMFS_IMAGE) > $(1).md5; \
-		$(TAR) -rf $(1) --transform='s/^.*/vmlinux.tmp.md5/' $(1).md5; \
-		\
-		echo "dummy" > $(1).rootfs; \
-		$(TAR) -rf $(1) --transform='s/^.*/squashfs.tmp/' $(1).rootfs; \
-		\
-		$(MKHASH) md5 $(1).rootfs > $(1).md5; \
-		$(TAR) -rf $(1) --transform='s/^.*/squashfs.tmp.md5/' $(1).md5; \
-		\
-		echo '$(BOARD) $(VERSION_CODE) $(VERSION_NUMBER)' > $(1).version; \
-		$(TAR) -rf $(1) --transform='s/^.*/version.tmp/' $(1).version; \
-		\
-		$(CP) $(1) $(BIN_DIR)/; \
-	else \
-		echo "WARNING: initramfs kernel image too big, cannot generate factory image (actual $$(stat -c%s $@); max $(KERNEL_SIZE))" >&2; \
-	fi
-endef
-
 define Build/zytrx-header
 	$(eval board=$(word 1,$(1)))
 	$(eval version=$(word 2,$(1)))
@@ -2861,8 +2837,6 @@ define Device/ubnt_edgerouter_common
   IMAGE_SIZE := 256768k
   FILESYSTEMS := squashfs
   KERNEL_SIZE := 6144k
-  KERNEL_INITRAMFS := $$(KERNEL) | \
-	ubnt-erx-factory-image $(KDIR)/tmp/$$(KERNEL_INITRAMFS_PREFIX)-factory.tar
   IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
   DEVICE_PACKAGES += -wpad-basic-mbedtls -uboot-envtools
   DEVICE_COMPAT_VERSION := 2.0