sipeed-maix-bit: finetune, kernel boots, but helloworld segfauts

target/config/Config.in.rootfs

@@ -103,6 +103,7 @@ config ADK_TARGET_ROOTFS_NFSROOT
 		   !ADK_TARGET_SIM && \
 		   !ADK_TARGET_SYSTEM_ARANYM_M68K && \
 		   !ADK_TARGET_SYSTEM_LINKSYS_NSLU2 
+	depends on ADK_TARGET_WITH_NETDEVICE
 	help
 	  Root filesystem mounted via NFS. (DHCP)
 

target/config/Config.in.runtime

@@ -15,10 +15,12 @@ prompt "init system"
 depends on !ADK_APPLIANCE_TOOLCHAIN
 default ADK_RUNTIME_INIT_SYSV if ADK_PACKAGE_BUSYBOX
 default ADK_RUNTIME_INIT_SIMPLEINIT if ADK_PACKAGE_TOOLBOX
+default ADK_RUNTIME_INIT_SIMPLEINIT if ADK_TARGET_SYSTEM_SIPEED_MAIX_BIT
 
 config ADK_RUNTIME_INIT_SYSV
 	bool "Use busybox init"
-	depends on ADK_PACKAGE_BUSYBOX
+	depends on ADK_PACKAGE_BUSYBOX && \
+		   !ADK_TARGET_SYSTEM_SIPEED_MAIX_BIT
 
 config ADK_RUNTIME_INIT_SIMPLEINIT
 	bool "Use a very simple init"
@@ -355,6 +357,7 @@ config ADK_RUNTIME_CONSOLE_SERIAL_DEVICE
 	default "ttySC1" if ADK_TARGET_SYSTEM_QEMU_SH
 	default "ttySC0" if ADK_TARGET_SYSTEM_SIM_H8300H
 	default "ttySC2" if ADK_TARGET_SYSTEM_HITACHI_EDOSK2674
+	default "ttySIF0" if ADK_TARGET_SYSTEM_SIPEED_MAIX_BIT
 	default "ttymxc0" if ADK_TARGET_SYSTEM_SOLIDRUN_IMX6
 	default "ttymxc1" if ADK_TARGET_SYSTEM_PHYTEC_IMX6
 	default "ttyAMA0" if ADK_TARGET_SYSTEM_RASPBERRY_PI

target/linux/Config.in.kernelcfg

@@ -4,6 +4,7 @@
 choice 
 prompt "Kernel configuration" if !ADK_TARGET_CHOOSE_ARCH
 depends on ADK_TARGET_OS_LINUX
+default ADK_TARGET_LINUX_KERNEL_USE_DEFCONFIG if ADK_TARGET_SYSTEM_SIPEED_MAIX_BIT
 default ADK_TARGET_LINUX_KERNEL_USE_DEFCONFIG if ADK_TARGET_SYSTEM_BEAGLEBONE_BLACK && ADK_TARGET_LINUX_KERNEL_VERSION_GIT
 default ADK_TARGET_LINUX_KERNEL_USE_DEFCONFIG if ADK_TARGET_SYSTEM_PHYTEC_WEGA && ADK_TARGET_LINUX_KERNEL_VERSION_GIT
 default ADK_TARGET_LINUX_KERNEL_USE_DEFCONFIG if ADK_TARGET_SYSTEM_SOLIDRUN_CLEARFOG && ADK_TARGET_LINUX_KERNEL_VERSION_GIT
@@ -47,6 +48,7 @@ config ADK_TARGET_LINUX_KERNEL_DEFCONFIG
 	default "i386_defconfig" if ADK_TARGET_SYSTEM_GENERIC_X86
 	default "stm32_defconfig" if ADK_TARGET_SYSTEM_ST_STM32F429
 	default "stm32_defconfig" if ADK_TARGET_SYSTEM_ST_STM32F769
+	default "nommu_k210_defconfig" if ADK_TARGET_SYSTEM_SIPEED_MAIX_BIT
 	default ""
 
 config ADK_TARGET_LINUX_KERNEL_CUSTOMCONFIG_PATH

target/linux/Config.in.kernelversion

@@ -49,6 +49,7 @@ config ADK_TARGET_LINUX_KERNEL_VERSION_5_10
 	depends on !ADK_TARGET_ARCH_CRIS
 	depends on !ADK_TARGET_ARCH_FRV
 	depends on !ADK_TARGET_ARCH_METAG
+	depends on !ADK_TARGET_SYSTEM_SIPEED_MAIX_BIT
 
 config ADK_TARGET_LINUX_KERNEL_VERSION_5_4
 	bool "5.4.179"
@@ -57,6 +58,7 @@ config ADK_TARGET_LINUX_KERNEL_VERSION_5_4
 	depends on !ADK_TARGET_ARCH_CRIS
 	depends on !ADK_TARGET_ARCH_FRV
 	depends on !ADK_TARGET_ARCH_METAG
+	depends on !ADK_TARGET_SYSTEM_SIPEED_MAIX_BIT
 
 config ADK_TARGET_LINUX_KERNEL_VERSION_4_19
 	bool "4.19.213"

target/riscv64/Makefile

@@ -47,6 +47,9 @@ ifeq ($(ADK_TARGET_QEMU),y)
 	@echo "Start qemu with following command line:"
 	@echo 'qemu-system-riscv64 ${QEMU_ARGS} -kernel $(FW_DIR)/$(TARGET_KERNEL)'
 endif
+ifeq ($(ADK_TARGET_SYSTEM_SIPEED_MAIX_BIT),y)
+	@echo 'sudo python3 scripts/kflash.py -p /dev/ttyUSB0 -b 1500000 -t $(FW_DIR)/$(TARGET_KERNEL)'
+endif
 endif
 ifeq ($(ADK_TARGET_FS),nfsroot)
 targethelp:

target/riscv64/systems/sipeed-maix-bit

@@ -1,6 +1,7 @@
 config ADK_TARGET_SYSTEM_SIPEED_MAIX_BIT
 	bool "Sipeed MAiX Bit"
 	select ADK_TARGET_CPU_RISCV64
+	select ADK_TARGET_WITH_SERIAL
 	select ADK_TARGET_KERNEL_IMAGE
 	help
 	  Sipeed MAiX Bit support.