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交叉编译环境：

wget https://releases.linaro.org/components/toolchain/binaries/latest-7/aarch64-linux-gnu/gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu.tar.xz
tar -Jxf gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu.tar.xz 
export PATH=$PATH:"`pwd`/gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu/bin/"
export CC=aarch64-linux-gnu-gcc
export CXX=aarch64-linux-gnu-g++
export LD=aarch64-linux-gnu-ld
export AR=aarch64-linux-gnu-ar
export RANLIB=aarch64-linux-gnu-ranlib

单独编译jemalloc、leveldb和snappy：

git clone https://github.com/ideawu/ssdb.git
cd ssdb/deps/jemalloc-4.1.0/
./autogen.sh --host=aarch64-linux-gnu && make
cd ../leveldb-1.20/
make
cd ../snappy-1.1.0/
./configure --host=aarch64-linux-gnu && make
cd ../../

编译ssdb：

cat > build_config.mk <<EOF
CFLAGS = -DNDEBUG -D__STDC_FORMAT_MACROS -Wall -O2 -Wno-sign-compare
CFLAGS += -I "`pwd`/deps/leveldb-1.20/include"
CFLAGS += -I "`pwd`/deps/jemalloc-4.1.0/include"
CFLAGS += -DNEW_MAC
CLIBS = "`pwd`/deps/leveldb-1.20/out-static/libleveldb.a"
CLIBS += "`pwd`/deps/snappy-1.1.0/.libs/libsnappy.a"
CLIBS += "`pwd`/deps/jemalloc-4.1.0/lib/libjemalloc.a"
CLIBS += -pthread -lrt
EOF

sed -i 's/\$(shell sh/#\$(shell sh/' Makefile 
sed -i 's/chmod u+x "\${LEVELDB_PATH}/#chmod u+x "\${LEVELDB_PATH}/' Makefile 
sed -i 's/cd "\${LEVELDB_PATH}/#cd "\${LEVELDB_PATH}/' Makefile 
make

systemd管理：

[Unit]
Description=ssdb service
After=network.target

[Service]
LimitNOFILE=65535
Type=simple
User=ssdb
#PIDFile=/var/run/ssdb.pid
ExecStart=/usr/local/ssdb/ssdb-server /usr/local/ssdb/ssdb.conf -s start
ExecStop=/usr/local/ssdb/ssdb-server /usr/local/ssdb/ssdb.conf -s stop
#Restart=always
#RestartSec=5
#StartLimitBurst=3
#StartLimitInterval=60
#StandardOutput=null
#StandardError=null

[Install]
WantedBy=multi-user.target

使用ssdb用户运行，新建用户，数据目录给予权限：

useradd -M -s /usr/sbin/nologin ssdb
chown -R ssdb:ssdb /ssdb-data/

安装交叉编译环境见：ubuntu下交叉编译arm64/armbian内核模块。
下载5.3内核及wireguard最新源码，并打补丁到内核。

#git clone -b 5.3 --depth 1 https://github.com/150balbes/Amlogic_s905-kernel.git
git clone -b 5.3 --depth 1 https://github.com/w22gb8/Amlogic_s905-kernel.git
cd Amlogic_s905-kernel/
#git clone https://git.zx2c4.com/wireguard-linux-compat
git clone -b v1.0.20211208 --depth=1 https://github.com/WireGuard/wireguard-linux-compat.git
bash ./wireguard-linux-compat/kernel-tree-scripts/jury-rig.sh .

编译wireguard模块，版本后缀-aml-g12和内核后缀保持一致。

cp ../config-5.3.0-aml-g12 .config
make LOCALVERSION="-aml-g12" modules_prepare
make M=net/wireguard CONFIG_WIREGUARD=m modules
modinfo net/wireguard/wireguard.ko

替换升级wireguard内核模块：

systemctl stop wg-quick@wg0.service 
cp wireguard.ko /lib/modules/5.3.0-aml-g12/kernel/net/wireguard/
modprobe -r wireguard
systemctl start wg-quick@wg0.service 

根据网友的经验，有2种方法可解决此问题
1.反编译dtb文件修改：

apt install device-tree-compiler
dtc -I dtb -O dts -o n1.dts dtb.img 

修改soc->bus@c1100000->interrupt-controller@9880：

sed -i 's/phandle = <0x22>/#phandle = <0x22>/' n1.dts

再编译回dtb文件：

dtc -I dts -O dtb -o n1.dtb n1.dts

2.修改内核dts源码并编译，x64下配置arm64交叉编译环境：

wget https://releases.linaro.org/components/toolchain/binaries/latest-7/aarch64-linux-gnu/gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu.tar.xz
tar -Jxf gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu.tar.xz 
export ARCH=arm64 
export CROSS_COMPILE=/root/gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-

获取内核源码并修改，之前balbes150已修复，不知为何后面又删除了。

git clone https://github.com/150balbes/Amlogic_s905-kernel.git
cd Amlogic_s905-kernel/
sed -i 's/interrupts = <29/interrupts = <25/' arch/arm64/boot/dts/amlogic/meson-gxl-s905d-p230.dts

使用balbes150 armbian内核配置文件编译dtb：

cp config-5.8.7-arm-64 .config
make dtbs
cp arch/arm64/boot/dts/amlogic/meson-gxl-s905d-p230.dts meson-gxl-s905d-p230.dts ./

使用过程中发现内核提示以下错误：

WARNING: CPU: 0 PID: 113 at kernel/time/hrtimer.c:928 hrtimer_forward+0x88/0xc0
[  342.080941] Modules linked in: xt_REDIRECT xt_nat xt_owner ip6table_nat ip6_tables wireguard ....
[  342.081711] CPU: 0 PID: 113 Comm: kworker/u8:1 Tainted: G        WC        5.8.7-arm-64 #20.09
[  342.081738] Hardware name: Phicomm N1 (DT)
[  342.081817] Workqueue: events_freezable_power_ thermal_zone_device_check
[  342.081886] pstate: 20000085 (nzCv daIf -PAN -UAO BTYPE=--)
[  342.081944] pc : hrtimer_forward+0x88/0xc0
[  342.081997] lr : txdone_hrtimer+0xf4/0x110

使用5.4或5.3内核 dtb文件正常。
参考：
https://forum.armbian.com/topic/13211-fix-dtb-of-aml-s905d-phicomm-n1-box/
https://www.right.com.cn/forum/thread-2841496-1-1.html
https://www.right.com.cn/forum/thread-3271482-1-1.html

下载Jun's Loader DSM 6.2，然后转换为vmware可用的vmdk虚拟机硬盘格式。

qemu-img convert -f raw synoboot.img -O vmdk synboot.vmdk

添加虚拟机，内核选其它linux 4.x 64位，添加2个sata硬盘（这里选择scsi和ide都不能正常引导），第一个选择上面已存在的synboot硬盘文件，第二个新建硬盘用于安装群晖系统。
去群晖官网下载与synoboot对应的系统文件，启动虚拟机打开http://find.synology.com/或使用synology-assistant客户端安装群晖系统。