Where to further modify or remove some elements in the zImage and rootfs of the core-image-minimal build?

Where to further modify or remove some elements in the zImage and rootfs of the core-image-minimal build?

[Nguyễn Thanh Vũ]

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I'm currently trying to build a very small image for my imx freescale board
by further reducing the size of core-image-minimal build to make it boot
faster. However, I do not know where the recipes for building the zImage
(and rootfs) locate inside the yocto directory (fsl-release-bsp) to start
modifying. For example, the networking/drivers/sound part in the kernel
(net/built-in.o , sound/built-in.o ....). Can anyone give me some hints?

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Re: Where to further modify or remove some elements in the zImage and rootfs of the core-image-minimal build?

[Robert Yang]

Hi Nguyễn,

I don't quite understand what did you mean, did you mean where are the recipes ?
(bb files) ? For kernel, you can get if by:

$ bitbake -e virtual/kernel | grep '^FILE='

And for image:

$ bitbake -e core-image-minimal | grep '^FILE='

Please check yocto's doc for more info:

https://www.yoctoproject.org/documentation

You can start from:
Yocto Project Quick Start

And for kernel/bsp:
Yocto Project Linux Kernel Development Manual
Yocto Project Board Support Package (BSP) Developer's Guide

// Robert

On 01/10/2018 11:49 PM, Nguyễn Thanh Vũ  wrote:
> I'm currently trying to build a very small image for my imx freescale board by 
> further reducing the size of core-image-minimal build to make it boot faster. 
> However, I do not know where the recipes for building the zImage (and rootfs) 
> locate inside the yocto directory (fsl-release-bsp) to start modifying. For 
> example, the networking/drivers/sound part in the kernel (net/built-in.o , 
> sound/built-in.o ....). Can anyone give me some hints?
> 
>