[Buildroot] Linux kernel make target

[Buildroot] Linux kernel make target

[Nick Betteridge]

Hi,

I'm unable to find an option in menuconfig which allows me to specify a 
kernel target for 'make' - is this possible? In other words, I can see 
how to specify the kernel source location, the defconfig etc, but I also 
need to specify the target - in my case it's 'make nanopi6-images'.

Is there a way to do this?

Thanks,

Nick

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Re: [Buildroot] Linux kernel make target

[Jean-Michel Hautbois]

Hello Nick,

On 05/07/2023 07:21, Nick Betteridge wrote:
> Hi,
> 
> I'm unable to find an option in menuconfig which allows me to specify a 
> kernel target for 'make' - is this possible? In other words, I can see 
> how to specify the kernel source location, the defconfig etc, but I also 
> need to specify the target - in my case it's 'make nanopi6-images'.

If this target is a defconfig, you can use BR2_LINUX_KERNEL_DEFCONFIG.
But I think this is a custom target in a non-upstream kernel.
In this case, I don't think you will be able to do it directly and will 
probably need to modify linux/Config.in and linux/linux.mk files.

I would suggest you avoid doing that as this is not upstream, though.

Can you be a bit more precise about what this target does ? Is it a 
post-install target somehow ? I don't know nanopi6 nor the kernel you 
are using ;-).

Regards,
JM
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Re: [Buildroot] Linux kernel make target

[Nick Betteridge]

Salut JM
>> I'm unable to find an option in menuconfig which allows me to specify 
>> a kernel target for 'make' - is this possible? In other words, I can 
>> see how to specify the kernel source location, the defconfig etc, but 
>> I also need to specify the target - in my case it's 'make 
>> nanopi6-images'.
>
> Can you be a bit more precise about what this target does ? Is it a 
> post-install target somehow ? I don't know nanopi6 nor the kernel you 
> are using ;-).
>
The friendlyelec nanopi t6 uses a forked kernel [1] and the build 
sequence is defined in [2] with a 'make' defined in [3]. The 'make' 
command also generates a 'resource.img' which is included in the 
construction of the image [4]

I guess that if I'm unable to add the target to the menuconfig kernel 
build options then I'll have to create the resource.img in a post-build 
script.

Just trying to avoid writing another script :)

Regards,

Nick

[1] https://github.com/friendlyarm/kernel-rockchip -b nanopi5-v5.10.y_opt

[2] 
https://wiki.friendlyelec.com/wiki/index.php/NanoPC-T6#Build_kernel_linux-v5.10.y

[3] make CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 nanopi6-images 
-j$(nproc)

[4] 
https://wiki.friendlyelec.com/wiki/index.php/NanoPC-T6#Install_to_target_board

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Re: [Buildroot] Linux kernel make target

[Nick Betteridge]

>>
>> I'm unable to find an option in menuconfig which allows me to specify 
>> a kernel target for 'make' - is this possible? In other words, I can 
>> see how to specify the kernel source location, the defconfig etc, but 
>> I also need to specify the target - in my case it's 'make 
>> nanopi6-images'.
>
> If this target is a defconfig, you can use BR2_LINUX_KERNEL_DEFCONFIG.
> But I think this is a custom target in a non-upstream kernel.
> In this case, I don't think you will be able to do it directly and 
> will probably need to modify linux/Config.in and linux/linux.mk files.
>
It works, of course! Setting the 'kernel image target name' to 
'nanopi6-images' and 'kernel image name' to 'Image' - I had neglected to 
set the 'kernel image name'.
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