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Use cargo bootimage instead of bootimage run

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Philipp Oppermann
2019-04-25 13:17:18 +02:00
parent 2377c0a579
commit 22bc414972
1 changed files with 4 additions and 10 deletions
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14
blog/content/second-edition/posts/02-minimal-rust-kernel/index.md
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@@ -385,7 +385,7 @@ For running `bootimage` and building the bootloader, you need to have the `llvm-
After installing `bootimage` and adding the `llvm-tools-preview` component, we can create a bootable disk image by executing:
```
> bootimage build --target x86_64-blog_os.json
> cargo bootimage
```
We see that the tool recompiles our kernel using `cargo xbuild`, so it will automatically pick up any changes you make. Afterwards it compiles the bootloader, which might take a while. Like all crate dependencies it is only built once and then cached, so subsequent builds will be much faster. Finally, `bootimage` combines the bootloader and your kernel to a bootable disk image.
@@ -415,17 +415,11 @@ We can now boot the disk image in a virtual machine. To boot it in [QEMU], execu
warning: TCG doesn't support requested feature: CPUID.01H:ECX.vmx [bit 5]
```
This opens a separate window with that looks like this:
![QEMU showing "Hello World!"](qemu.png)
Alternatively, you can invoke the `run` subcommand of the `bootimage` tool:
```
> bootimage run
```
By default it invokes the exact same QEMU command as above. Additional QEMU options can be passed after a `--`. For example, `bootimage run -- --help` will show the QEMU help. It's also possible to change the default command through an `run-command` key in the `package.metadata.bootimage` table in the `Cargo.toml`. For more information see the `--help` output or the [Readme file].
[Readme file]: https://github.com/rust-osdev/bootimage/blob/master/Readme.md
We see that our "Hello World!" is visible on the screen.
### Real Machine