[openwrt/openwrt] ath79: mikrotik: use vmlinuz (zBoot ELF)

[LEDE Commits]

981213 pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/e91344776b9ba7c864be88d915c9c0df0eb790dd

commit e91344776b9ba7c864be88d915c9c0df0eb790dd
Author: John Thomson <git at johnthomson.fastmail.com.au>
AuthorDate: Thu Oct 15 19:27:55 2020 +1000

    ath79: mikrotik: use vmlinuz (zBoot ELF)
    
    - minimal built initramfs: 10MB vmlinux ELF -> 6MB vmlinuz
    - ~5 seconds for kernel decompression, which was equivalent to the
      additional time to load the uncompressed ELF from SPI NOR.
    - Removes requirement for lzma-loader, which may have been causing some
      image builds to fail to boot on Mikrotik mt7621.
    
    Suggested-by: Thibaut VARÈNE <hacks at slashdirt.org>
    Signed-off-by: John Thomson <git at johnthomson.fastmail.com.au>
---
 target/linux/ath79/image/common-mikrotik.mk | 6 +++---
 target/linux/ath79/mikrotik/target.mk       | 2 ++
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/target/linux/ath79/image/common-mikrotik.mk b/target/linux/ath79/image/common-mikrotik.mk
index 9ac89fdcb1..b0c3feda20 100644
--- a/target/linux/ath79/image/common-mikrotik.mk
+++ b/target/linux/ath79/image/common-mikrotik.mk
@@ -1,8 +1,8 @@
 define Device/mikrotik
 	DEVICE_VENDOR := MikroTik
-	LOADER_TYPE := elf
-	KERNEL := kernel-bin | append-dtb | lzma | loader-kernel
-	KERNEL_INITRAMFS := kernel-bin | append-dtb | lzma | loader-kernel
+	KERNEL_NAME := vmlinuz
+	KERNEL := kernel-bin | append-dtb-elf
+	KERNEL_INITRAMFS := kernel-bin | append-dtb-elf
 endef
 
 define Device/mikrotik_nor
diff --git a/target/linux/ath79/mikrotik/target.mk b/target/linux/ath79/mikrotik/target.mk
index 0394f4427d..fb5171fea7 100644
--- a/target/linux/ath79/mikrotik/target.mk
+++ b/target/linux/ath79/mikrotik/target.mk
@@ -1,5 +1,7 @@
 BOARDNAME := MikroTik devices
 FEATURES += minor nand squashfs
+KERNELNAME := vmlinux vmlinuz
+IMAGES_DIR := ../../..
 
 DEFAULT_PACKAGES += wpad-basic-wolfssl