linux: allow the selection of the architecture's default configuration
commit53ced1f6d3da6b037d45a70ed0d8a25f5ab15142
authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Tue, 14 Jun 2016 10:19:58 +0000 (14 12:19 +0200)
committerThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Sat, 18 Jun 2016 13:05:15 +0000 (18 15:05 +0200)
tree86b3f4bb56c4cce1a69ddb8956a73ec706246719
parentbcc8d367140d00f76aba6ef4387a12469fa0c024
linux: allow the selection of the architecture's default configuration

To configure the Linux kernel, we currently provide two options:

 1. Passing a defconfig name (for example "multi_v7"), to which we append
    "_defconfig" to run "make multi_v7_defconfig".

 2. Passing a path to a custom configuration file.

Unfortunately, those two possibilities do not allow to configure the
kernel when you want to use the default configuration built into the
kernel for a given architecture. For example, on ARM64, there is a
single defconfig simply called "defconfig", which you can load by
running "make defconfig".

Using the mechanism (1) above doesn't work because we append
"_defconfig" automatically.

One solution would be to change (1) and require the user to enter the
full defconfig named (i.e "multi_v7_defconfig" instead of "multi_v7"),
but we would break all existing Buildroot configurations.

So instead, we add a third option, which simply tells Buildroot to use
the default configuration for the selected architecture. In this case,
Buildroot will configure the kernel by running "make defconfig".

Cc: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
linux/Config.in
linux/linux.mk