How to copy custom files into the zImage-initramfs via the buildroot folders

For Developers
1

Hello there,

Can someone help me copy my custom driver files in the buildroot so that it comes inside the zImage-initramfs image when i boot that image from SD card.

I have tried all the below paths, but it is not getting copied into the zImage-initramfs, when i boot the image the /lib/firmware folder is empty
build_dir/target-arm_cortex-a9+neon_musl_eabi/root-imx6/lib
build_dir/target-arm_cortex-a9+neon_musl_eabi/root.orig-imx6/lib
staging_dir/target-arm_cortex-a9+neon_musl_eabi/root-imx6/lib
build_dir/target-arm_cortex-a9+neon_musl_eabi/linux-imx6/base-files/.pkgdir/base-files/lib
build_dir/target-arm_cortex-a9+neon_musl_eabi/linux-imx6/base-files/ipkg-arm_cortex-a9_neon/base-files/lib

Below are the files im trying to copy in /lib folder

lib/modules/4.19.52/kernel/drivers/net/wireless/broadcom/brcm80211/brcmfmac/brcmfmac.ko
lib/modules/4.19.52/kernel/drivers/net/wireless/broadcom/brcm80211/brcmutil/brcmutil.ko
lib/modules/4.19.52/kernel/net/bluetooth/bluetooth.ko
lib/modules/4.19.52/kernel/net/wireless/cfg80211.ko
lib/modules/4.19.52/kernel/compat/compat.ko

lib/firmware/brcm/4343w.hcd -> bcm4343w/4343w.hcd
lib/firmware/brcm/bcm4343w/4343w.hcd
lib/firmware/brcm/bcm4343w/brcmfmac43430-sdio.bin -> brcmfmac43430-sdio-prod.bin
lib/firmware/brcm/bcm4343w/brcmfmac43430-sdio.clm_blob
lib/firmware/brcm/bcm4343w/brcmfmac43430-sdio-etsi.txt
lib/firmware/brcm/bcm4343w/brcmfmac43430-sdio-prod.bin
lib/firmware/brcm/bcm4343w/brcmfmac43430-sdio.txt -> brcmfmac43430-sdio-etsi.txt
lib/firmware/brcm/brcmfmac43430-sdio.bin -> bcm4343w/brcmfmac43430-sdio.bin
lib/firmware/brcm/brcmfmac43430-sdio.clm_blob -> bcm4343w/brcmfmac43430-sdio.clm_blob
lib/firmware/brcm/brcmfmac43430-sdio.txt -> bcm4343w/brcmfmac43430-sdio-etsi.txt

2

Duplicate of this post: Removing Wireless drivers from the linux kernel for OpenWrt build

3

NOT A DUPLICATE !!
The reference i made in the another post is now removed, so this post is explicit for the question to help the community. So this is not a duplicate question and is specifically valid for the description.

Btw the answer i had received on other threads is still not the solution for this problem. So this will allow community to answer this question here.

6

If you're just trying to place the files into the final image, and aside from whether you'll be able to actually USE them, you just create a folder called files in your OpenWrt root directory.

Then you build out the directory structure and files that you want to be put on the rootfs.

For example, I have custom /etc/config files that need to be loaded.

grommish@norwits:~/openwrt/files/etc/config$ ls -la
total 20
drwxr-xr-x 2 grommish grommish 4096 Jun 29 13:36 .
drwxr-xr-x 6 grommish grommish 4096 Jun 29 13:36 ..
-rwxr-xr-x 1 grommish grommish  522 Jun 29 13:36 firstboot-sh
-rw-r--r-- 1 grommish grommish  636 Jun 28 04:15 network
-rw-r--r-- 1 grommish grommish  267 Jun 27 02:49 snort
grommish@norwits:~/openwrt/files/etc/config$

You can go down as deep as you need to.

grommish@norwits:~/openwrt/files$ ls -la usr/lib/lua/luci/model/cbi
total 28
drwxr-xr-x 2 grommish grommish 4096 Jun 27 02:45 .
drwxr-xr-x 3 grommish grommish 4096 Jun 24 15:23 ..
-rwxr-xr-x 1 grommish grommish 9898 Jun 27 01:38 snort.lua
-rwxr-xr-x 1 grommish grommish 7576 Jun 24 15:23 snort.lua.bak
grommish@norwits:~/openwrt/files$
1 Like
7

Thanks Grommish. Yes it mentioned in this page as you had described.
https://openwrt.org/docs/guide-developer/build-system/use-buildsystem#custom_files