rt-smart 内核编译以后，文件系统找不到

发布于 2023-09-01 17:12:21 浏览：825 订阅该版

[tocm]

# rt-smart

## 说明

整理流程很像 linux, 先 load 内核，再加载 rootfs

## 步骤

### 配置 toolchain

下载

```sh
http://117.143.63.254:9012/www/rt-smart/aarch64-linux-musleabi_for_x86_64-pc-linux-gnu_latest.tar.bz2
```

```sh
export RTT_CC="gcc"
export RTT_EXEC_PATH="/opt/aarch64-linux-musleabi/bin/"
export RTT_CC_PREFIX="aarch64-linux-musleabi-"
export PATH="$RTT_EXEC_PATH:$PATH"
```

### 编译内核

```sh
git clone https://github.com/RT-Thread/rt-thread

cd bsp/qemu-virt64-aarch64
scons --menuconfig
```

```sh
RT-Thread Kernel --->
[*] Enable RT-Thread Smart (microkernel on kernel/userland)
```

```sh
scons -c; scons
```

### rootfs

#### 编译用户态程序

```sh
git clone https://github.com/RT-Thread/userapps.git
cd userapps; source env.sh
cd apps
```

先编译

```sh
xmake -j8
```

如果报错，则导出 toolchain

```sh
xmake smart-rootfs --export=all
```

重新 make

```sh
xmake -j8
```

#### 生成 rootfs

在 `apps/build/` 下会生成一个 rootfs 目录

```sh
xmake smart-rootfs
```

#### 生成磁盘镜像

```sh
xmake smart-image -o ../prebuilt/qemu-virt64-aarch64/ext4.img
```

#### 运行应用

新编译的内核复制到 prebuilt/qemu-virt64-aarch64 以后

```sh
ls /
```

结果为空，用原来的内核加载ext4.img能看到文件，请问编译内核的时候需要注意什么吗？

张世争 2023-09-01

学以致用

3 个回答

921742079 2023-09-01

这家伙很懒，什么也没写！

怎么查看文件系统挂载成功与否？
这是用build的内核替换预编译的rtthread.bin
```sh
$ sh ./run.sh 
[I/libcpu.aarch64.cpu] Using MPID 0x0 as cpu 0
[E/libcpu.aarch64.cpu] Cannot read method from cpu node
[E/libcpu.aarch64.cpu] Failed to find hardware id of CPU 1
[E/libcpu.aarch64.cpu] Failed to find hardware id of CPU 2
[E/libcpu.aarch64.cpu] Failed to find hardware id of CPU 3

\ | /
- RT -     Thread Smart Operating System
 / | \     5.0.1 build Sep  1 2023 21:39:39
 2006 - 2022 Copyright by RT-Thread team
[E/libcpu.aarch64.cpu] No cpu_ops was probed for CPU 1. Try to configure it or use fdt
[E/libcpu.aarch64.cpu] No cpu_ops was probed for CPU 2. Try to configure it or use fdt
[E/libcpu.aarch64.cpu] No cpu_ops was probed for CPU 3. Try to configure it or use fdt
hello rt-thread
msh />mount
filesystem  device  mountpoint
----------  ------  ----------
devfs       (NULL)  /dev
msh />ls
No such directory
msh />ls /
No such directory
```

自带的内核
```sh
$ sh run.sh

\ | /
- RT -     Thread Smart Operating System
 / | \     5.0.1 build Jun 21 2023 13:52:00
 2006 - 2022 Copyright by RT-Thread team
lwIP-2.0.3 initialized!
[I/sal.skt] Socket Abstraction Layer initialize success.
file system initialization done!
hello rt-thread
msh />mount
filesystem  device  mountpoint  refcount
----------  ------  ----------  --------
ext         virtio  /            3
devfs       (NULL)  /dev         2
msh />
```

对比看似乎是virtio没有加载成功，但是默认的virtio的blk和input等都是选中的。

```sh
[*] Using VirtIO BLK 
[ ] Using VirtIO NET
[*] Using VirtIO Console
[*] Using VirtIO GPU
[*] Using VirtIO Input 
```

张世争 2023-09-02

学以致用

921742079 2023-09-02

这家伙很懒，什么也没写！

看mnt.c

```c
/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2021/08/19     bernard      the first version
 */

#include <rtthread.h>

#ifdef RT_USING_DFS
#include <dfs_fs.h>

int mnt_init(void)
{
    if (rt_device_find("virtio-blk0"))
    {
        /* mount virtio-blk as root directory */
        if (dfs_mount("virtio-blk0", "/", "elm", 0, RT_NULL) == 0)
        {
            rt_kprintf("file system initialization done!\n");
        }
        else
        {
            if (dfs_mount("virtio-blk0", "/", "ext", 0, RT_NULL) == 0)
            {
                rt_kprintf("file system initialization done!\n");
            }
            else
            {
                rt_kprintf("file system initialization fail!\n");
            }
        }
    }

return 0;
}
INIT_ENV_EXPORT(mnt_init);
#endif
```

看起来可能是virtio-blk0找不到，不知道要怎么做，才能找到。

置于qemu的版本，我用的是manjaro, 包也就比arch慢两周左右push, 应该不太像版本问题，我userapps里面自带的内核，也是一样的qemu,没问题的。

```sh
$ qemu-system-aarch64  --version
QEMU emulator version 8.0.4
Copyright (c) 2003-2022 Fabrice Bellard and the QEMU Project developers
```

921742079 2023-09-02

这家伙很懒，什么也没写！

又对着文档尝试了若干次，还是不行，这段string，我全局搜索rtt源码，没搜到，奇怪的
```sh
initialize mnt_initfile system initialization fail!
```

```sh
$ sh run.sh 
[I/libcpu.aarch64.cpu] Using MPID 0x0 as cpu 0
[E/libcpu.aarch64.cpu] Cannot read method from cpu node
initialize rti_board_start:0 done
initialize rt_ktime_hrtimer_lock_init:0 done

\ | /
- RT -     Thread Smart Operating System
 / | \     5.0.1 build Sep  2 2023 13:06:00
 2006 - 2022 Copyright by RT-Thread team
do components initialization.
initialize rti_board_end:0 done
initialize dfs_init:0 done
initialize rt_work_sys_workqueue_init:0 done
initialize futex_system_init:0 done
initialize pmutex_system_init:0 done
initialize null_device_init:0 done
initialize random_device_init:0 done
initialize urandom_device_init:0 done
initialize zero_device_init:0 done
initialize rt_soft_rtc_init:0 done
initialize ptmx_register:0 done
initialize critical_init:0 done
initialize rt_hw_gpio_init:0 done
initialize rt_hw_rtc_init:0 done
initialize rt_virtio_devices_init:0 done
initialize elm_init:0 done
initialize dfs_romfs_init:0 done
initialize rx_thread_init:0 done
initialize rt_posix_stdio_init:0 done
initialize console_init:0 done
initialize graphic_init:0 done
initialize mnt_initfile system initialization fail!
:0 done
initialize pin_init:0 done
initialize finsh_system_init:0 done
hello rt-thread
msh />ls
No such directory
msh />mount
filesystem  device  mountpoint
----------  ------  ----------
devfs       (NULL)  /dev
msh />
```