Minimum build config for boot messages

[John de la Garza]

On Fri, Aug 19, 2016 at 04:17:22PM +0200, Andre Schmidt wrote:
> make ARCH=x86_64 allnoconfig
> make all
> qemu-system-x86_64 -kernel arch/x86/boot/bzImage
> 
> Those commands above used to be enough, but now the produced kernel doesn't print any messages on the qemu screen.
> 
> With some trial-and-error i was able to track down this commit
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/init/Kconfig?id=5d2acfc7b974bbd3858b4dd3f2cdc6362dd8843a
> and if i add CONFIG_EMBEDDED=n to my KCONFIG_ALLCONFIG file, i can see kernel errors again.
> (CONFIG_EMBEDDED=n sounds pretty generic and doesn't feel right)

> Can you reproduce this?

yes

> ps. i'm aware of defconfig, but i would like to experiment/learn from bottom-up, rather than top-down.

I've done the same and would have expected the the previous behavior,
too.