configs: mediatek: enable boot via extlinux

Enable FAT and SYSBOOT to use extlinux boot script

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Alexandre Mergnat <amergnat@baylibre.com>
Signed-off-by: Julien STEPHAN <jstephan@baylibre.com>
diff --git a/configs/mt8516_pumpkin_defconfig b/configs/mt8516_pumpkin_defconfig
index 0f31e05..10d8214 100644
--- a/configs/mt8516_pumpkin_defconfig
+++ b/configs/mt8516_pumpkin_defconfig
@@ -6,6 +6,7 @@
 CONFIG_SYS_MALLOC_F_LEN=0x4000
 CONFIG_NR_DRAM_BANKS=1
 CONFIG_ENV_SIZE=0x1000
+CONFIG_ENV_OFFSET=0x0
 CONFIG_DM_GPIO=y
 CONFIG_DEFAULT_DEVICE_TREE="mt8516-pumpkin"
 CONFIG_TARGET_MT8516=y
@@ -49,6 +50,12 @@
 # CONFIG_CMD_SETEXPR is not set
 # CONFIG_CMD_BLOCK_CACHE is not set
 # CONFIG_CMD_SLEEP is not set
+CONFIG_CMD_SYSBOOT=y
+CONFIG_CMD_EXT4=y
+CONFIG_CMD_FAT=y
+CONFIG_CMD_FS_GENERIC=y
+# CONFIG_DOS_PARTITION is not set
+CONFIG_ENV_IS_IN_MMC=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG=y
 CONFIG_CLK=y