riscv 启动与树莓派不同（树莓派都在那个 EFI 分区中），一般来说需要先通过 opensbi 系统（相当于 Android 手机的 fastboot）将设备树（DTB）、SPI、uboot 刷进开发板的闪存（opensbi 本身也在闪存中，也可以自己升级自己，方法见前面的 PDF），然后才能启动正常的系统。
U-Boot SPL 2021.10 (Dec 25 2022 - 20:59:18 +0800)
DDR version: dc2e84f0.
Trying to boot from SPI
OpenSBI v1.0
____ _____ ____ _____
/ __ \ / ____| _ \_ _|
| | | |_ __ ___ _ __ | (___ | |_) || |
| | | | '_ \ / _ \ '_ \ \___ \| _ < | |
| |__| | |_) | __/ | | |____) | |_) || |_
\____/| .__/ \___|_| |_|_____/|____/_____|
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Platform Name : StarFive VisionFive V2
Platform Features : medeleg
Platform HART Count : 5
Platform IPI Device : aclint-mswi
Platform Timer Device : aclint-mtimer @ 4000000Hz
Platform Console Device : uart8250
Platform HSM Device : ---
Platform Reboot Device : ---
Platform Shutdown Device : ---
Firmware Base : 0x40000000
Firmware Size : 360 KB
Runtime SBI Version : 0.3
Domain0 Name : root
Domain0 Boot HART : 1
Domain0 HARTs : 0*,1*,2*,3*,4*
Domain0 Region00 : 0x0000000002000000-0x000000000200ffff (I)
Domain0 Region01 : 0x0000000040000000-0x000000004007ffff ()
Domain0 Region02 : 0x0000000000000000-0xffffffffffffffff (R,W,X)
Domain0 Next Address : 0x0000000040200000
Domain0 Next Arg1 : 0x0000000042200000
Domain0 Next Mode : S-mode
Domain0 SysReset : yes
Boot HART ID : 1
Boot HART Domain : root
Boot HART Priv Version : v1.11
Boot HART Base ISA : rv64imafdcbx
Boot HART ISA Extensions : none
Boot HART PMP Count : 8
Boot HART PMP Granularity : 4096
Boot HART PMP Address Bits: 34
Boot HART MHPM Count : 2
Boot HART MIDELEG : 0x0000000000000222
Boot HART MEDELEG : 0x000000000000b109
U-Boot 2021.10 (Dec 25 2022 - 20:59:18 +0800), Build: jenkins-github_visionfive2-4
CPU: rv64imacu
Model: StarFive VisionFive V2
DRAM: 4 GiB
MMC: sdio0@16010000: 0, sdio1@16020000: 1
Loading Environment from SPIFlash... SF: Detected gd25lq128 with page size 256 Bytes, erase size 4 KiB, total 16 MiB
*** Warning - bad CRC, using default environment
StarFive EEPROM format v2
--------EEPROM INFO--------
Vendor : StarFive Technology Co., Ltd.
Product full SN: VF7110B1-2310-D004E000-00001875
data version: 0x2
PCB revision: 0xb2
BOM revision: A
Ethernet MAC0 address: 6c:cf:39:00:53:14
Ethernet MAC1 address: 6c:cf:39:00:53:15
--------EEPROM INFO--------
In: serial@10000000
Out: serial@10000000
Err: serial@10000000
Model: StarFive VisionFive V2
Net: eth0: ethernet@16030000, eth1: ethernet@16040000
switch to partitions #0, OK
mmc1 is current device
found device 1
bootmode flash device 1
** Invalid partition 3 **
Couldn't find partition mmc 1:3
Can't set block device
** Invalid partition 3 **
Couldn't find partition mmc 1:3
Can't set block device
Hit any key to stop autoboot: 0 # 在电脑的串口软件上按任意键输入，否则会启动没有准备好的 OpenBSD
StarFive # # 已经进入 opensbi
StarFive # dhcp
StarFive # setenv serverip 192.168.1.169 # 192.168.1.169 仅作示例，这里需要填你 tftp 服务器真实的 IP 地址
StarFive # tftpboot ${fdt_addr_r} jh7110-starfive-visionfive-2-v1.3b.dtb
StarFive # load mmc 1:1 ${kernel_addr_r} efi/boot/bootriscv64.efi
StarFive # bootefi ${kernel_addr_r} ${fdt_addr_r} # 输入完成后自动引导 OpenBSD 的 uboot，OpenBSD 开机
echo "hw.perfpolicy=high" >> /etc/sysctl.conf
