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manual: board support: add more of our expectations 

The manual has a section on adding board support to upstream buildroot,
but it fails to mention some of the things we expect. Add more of them.

- Internal toolchain.
- Beautify defconfig file.
- Fixed versions for components.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Cc: Adam Duskett <Aduskett@gmail.com>
Reviewed-by: Adam Duskett <aduskett@gmail.com>
[yann.morin.1998@free.fr:
  - use +monospace+ for the variables
  - use _italic_ for sections in defconfig
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit af6cffb64e)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
2020.08.x
Arnout Vandecappelle (Essensium/Mind) 2020-09-02 23:32:55 +02:00 committed by Peter Korsgaard
parent 9e300866d1
commit 210af9cc98
1 changed files with 14 additions and 4 deletions
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18
docs/manual/adding-board-support.txt
View File

@ -10,9 +10,9 @@ that is known to work. You are welcome to add support for other boards
to Buildroot too.
To do so, you need to create a normal Buildroot configuration that
builds a basic system for the hardware: toolchain, kernel, bootloader,
filesystem and a simple BusyBox-only userspace. No specific package
should be selected: the configuration should be as minimal as
builds a basic system for the hardware: (internal) toolchain, kernel,
bootloader, filesystem and a simple BusyBox-only userspace. No specific
package should be selected: the configuration should be as minimal as
possible, and should only build a working basic BusyBox system for the
target platform. You can of course use more complicated configurations
for your internal projects, but the Buildroot project will only
@ -22,7 +22,17 @@ selections are highly application-specific.
Once you have a known working configuration, run +make
savedefconfig+. This will generate a minimal +defconfig+ file at the
root of the Buildroot source tree. Move this file into the +configs/+
directory, and rename it +<boardname>_defconfig+.
directory, and rename it +<boardname>_defconfig+. If the configuration
is a bit more complicated, it is nice to manually reformat it and
separate it into sections, with a comment before each section. Typical
sections are _Architecture_, _Toolchain options_ (typically just linux
headers version), _Firmware_, _Bootloader_, _Kernel_, and _Filesystem_.
Always use fixed versions or commit hashes for the different
components, not the "latest" version. For example, set
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y+ and
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE+ to the kernel version you tested
with.
It is recommended to use as much as possible upstream versions of the
Linux kernel and bootloaders, and to use as much as possible default