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RISC-V引导运行Linux

  • 2026-07-01 00:04:19
RISC-V引导运行Linux
BootROM --> OpenSBI --> U-Boot(SPL-->U-Boot) -->Kernel
此处暂不讨论secure boot。
bootrom基本工作：
1. 上电复位2. 初始化时钟和基本硬件（比如启动介质SPI flash，SD/eMMC等）3. 判断启动介质（strap）4. 从启动介质加载“第一阶段固件”5. 跳转执行
opensbi基本工作：
  • 设置 M-mode（机器模式）
  • 配置 S-mode（内核运行模式），配置PMP（内存访问保护）
  • 配置中断/异常委托
  • 定义 M → S 的调用接口（SBI）
SBI 功能
用途
Timer
内核 tick
IPI
多核调度
Hart control
CPU 上下电
Console
early print

SBI 调用约定：

RISC-V SBI 规定：

寄存器
含义
a7
SBI Extension ID
a6
Function ID
a0-a5
参数
a0
返回值
opensbi运行在片内sram上。
opensbi运行在M-mode，U-Boot和Kernel运行在S-mode。
kernel 主动进入 OpenSBI，只能通过 ecall指令。
Linux kernel/U-Boot 发起 ecall → OpenSBI → 硬件timer→ 再回到 kernel流程：
Linux / U-Boot (S-mode)││ 1. ecall  SBI_SET_TIMER(next_event)▼OpenSBI (M-mode)，根据a7和a6调用对应handler││ 2. 编程 CLINT mtimecmp││ 3. mret 回到 S-mode▼硬件定时器││ 4. mtime >= mtimecmp││ 5. 触发 timer interrupt▼OpenSBI trap (M-mode)││ 6. 转换为 S-mode timer interrupt，即清除 machine timer interrupt，人为制造一      个 S-mode timer interrupt。若在opensbi中已经配置了中断委托，则无需此步骤。▼Linux kernel IRQ handler（S-mode）││ 7. tick / hrtimer / scheduler
对于IPI和PLIC中断，是同样的道理，kernel主动触发IPI核间中断也是通过ecall陷入M-mode之后写目标hart的msip，触发目标hart中断，目标hart可以选择配置ssip触发S-mode的software interrupt，也可以提前配置中断委托从而直接在kernel（S-mode）处理。
当PLIC外部中断到来，先进opensbi M-mode处理，同样可以选择配置seip触发
S-mode的external interrupt，也可以提前配置中断委托从而直接在kernel（S-mode）处理。
U-Boot 是“真正的板级初始化 + OS 装载器”
U-Boot基本工作：
  • DDR初始化，SoC板级初始化
  • 提供交互式调试环境
  • 加载 Linux Kernel / DTB
由于U-Boot体积一般大于SRAM大小，因此通常会分为SPL+U-Boot。
U-Boot SPL（Secondary Program Loader）：
  • 极小代码（<100KB）
  • 运行在 SRAM
  • 初始化 DDR
  • 把 U-Boot 搬到 DDR
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  1. CONNECT:[ UseTime:0.000845s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001857s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.006743s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000789s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001686s ]
  6. SELECT * FROM `set` [ RunTime:0.027239s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.002090s ]
  8. SELECT * FROM `article` WHERE `id` = 492142 LIMIT 1 [ RunTime:0.021758s ]
  9. UPDATE `article` SET `lasttime` = 1783086322 WHERE `id` = 492142 [ RunTime:0.025509s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.001686s ]
  11. SELECT * FROM `article` WHERE `id` < 492142 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005783s ]
  12. SELECT * FROM `article` WHERE `id` > 492142 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.015848s ]
  13. SELECT * FROM `article` WHERE `id` < 492142 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010575s ]
  14. SELECT * FROM `article` WHERE `id` < 492142 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.016640s ]
  15. SELECT * FROM `article` WHERE `id` < 492142 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004665s ]
0.343751s