configs: EXT4, FAT, hush shell, env on S-mode MAIX

* enable storing the environment in the SPI flash
* enable EXT4 and FAT file system
* enable hush shell
* run k210_bootcmd as default boot command

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Sean Anderson <seanga2@gmail.com>
diff --git a/configs/sipeed_maix_smode_defconfig b/configs/sipeed_maix_smode_defconfig
index 2516bb7..c20c389 100644
--- a/configs/sipeed_maix_smode_defconfig
+++ b/configs/sipeed_maix_smode_defconfig
@@ -1,10 +1,21 @@
 CONFIG_RISCV=y
 CONFIG_SYS_TEXT_BASE=0x80020000
+CONFIG_ENV_SIZE=0x1000
+CONFIG_ENV_OFFSET=0xfff000
+CONFIG_ENV_SECT_SIZE=0x1000
 CONFIG_TARGET_SIPEED_MAIX=y
 CONFIG_ARCH_RV64I=y
 CONFIG_RISCV_SMODE=y
 CONFIG_STACK_SIZE=0x100000
+CONFIG_USE_BOOTCOMMAND=y
+CONFIG_BOOTCOMMAND="run k210_bootcmd"
+CONFIG_HUSH_PARSER=y
+CONFIG_MTDIDS_DEFAULT="nor0=spi3:0"
+CONFIG_MTDPARTS_DEFAULT="nor0:1M(u-boot),0x1000@0xfff000(env)"
 # CONFIG_NET is not set
 # CONFIG_INPUT is not set
+CONFIG_SF_DEFAULT_BUS=3
 # CONFIG_DM_ETH is not set
+CONFIG_FS_EXT4=y
+CONFIG_FS_FAT=y
 # CONFIG_EFI_UNICODE_CAPITALIZATION is not set