uboot-mediatek: add support for compressed BL3/FIP image

MediaTek's ARM Trusted Firmware v2.7+ allows the images inside a FIP
structure to be compressed. Make use of that for boards with NOR flash.

Signed-off-by: Daniel Golle <[email protected]>

package/boot/arm-trusted-firmware-mediatek/patches/100-increase-nor-bl3-size.patch

@@ -1,11 +0,0 @@
---- a/plat/mediatek/mt7622/bl2_boot_nor.c
-+++ b/plat/mediatek/mt7622/bl2_boot_nor.c
-@@ -12,7 +12,7 @@
- #define MT7622_NOR_MAP_BASE		0x30000000
- 
- #define FIP_BASE			0x20000
--#define FIP_SIZE			0x80000
-+#define FIP_SIZE			0xa0000
- 
- const io_block_spec_t mtk_boot_dev_fip_spec = {
- 	.offset	= MT7622_NOR_MAP_BASE + FIP_BASE,

package/boot/uboot-mediatek/Makefile

@@ -132,6 +132,7 @@ define U-Boot/mt7622_ubnt_unifi-6-lr
   BL2_BOOTDEV:=nor
   BL2_DDRBLOB:=2
   DEPENDS:=+trusted-firmware-a-mt7622-nor-2ddr
+  FIP_COMPRESS:=1
 endef
 
 define U-Boot/mt7623a_unielec_u7623
@@ -196,9 +197,13 @@ UBOOT_MAKE_FLAGS += $(UBOOT_IMAGE:.fip=.bin)
 endif
 
 define Build/fip-image
+	$(if $(FIP_COMPRESS),\
+		xz -f -e -k -9 -C crc32 $(STAGING_DIR_IMAGE)/$(BUILD_SUBTARGET)-$(BL2_BOOTDEV)-$(BL2_DDRBLOB)ddr-bl31.bin ;\
+		xz -f -e -k -9 -C crc32 $(PKG_BUILD_DIR)/u-boot.bin \
+	)
 	$(STAGING_DIR_HOST)/bin/fiptool create \
-		--soc-fw $(STAGING_DIR_IMAGE)/$(BUILD_SUBTARGET)-$(BL2_BOOTDEV)-$(BL2_DDRBLOB)ddr-bl31.bin \
-		--nt-fw $(PKG_BUILD_DIR)/u-boot.bin \
+		--soc-fw $(STAGING_DIR_IMAGE)/$(BUILD_SUBTARGET)-$(BL2_BOOTDEV)-$(BL2_DDRBLOB)ddr-bl31.bin$(if $(FIP_COMPRESS),.xz) \
+		--nt-fw $(PKG_BUILD_DIR)/u-boot.bin$(if $(FIP_COMPRESS),.xz) \
 		$(PKG_BUILD_DIR)/u-boot.fip
 endef