[Buildroot] First rootfile system build using buildroot

[Vicente Olivert Riera]

Dear Dinesh Guleria,

On 09/01/2015 01:02 PM, Dinesh Guleria wrote:
> First build is successful. Some questions from my side.
> 
> Following images are generated :--
> /output/images
> rootsfs.tar
> rootsfs.tar.gz
> 
> 
> 1> Why this fakeroot is downloaded ?

Because it's needed when generating the image files. Some actions
performed when creating the images would need superuser privileges, but
you run (or should run) Buildroot using a normal user account. fakeroot
fixes that issue by pretending a UID and GID of 0 (root).

> 2>  Also in the name of the crosscompiler tool chain their is word
> "686-pc" does it means tool chain for intel 686 PC ?

It means the toolchain binaries are built for that architecture, but
since it's a cross-toolchain, it can generate code for others.

> 3> How to configure the busybox ? Build root make menuconfig does not
> provide entry to configure the busy box ?
> /dl
> arm-2014.05-29-arm-none-linux-gnueabi-1686-pc-linux-gnu.tar.bz2
> fakeroot_1.18.4.orig.tar.bz2
> busybox-1.23.2.tar.bz2

make busybox-menuconfig

http://buildroot.org/manual.html#_configuration_of_other_components

> 
> 4> Is this the place where toolchain is unzipped ?
> /output/host/opt/ext-toolchain  location contains :--
> arm-none-linux-gnueabi 
> bin
> i686-pc-linux-gnu
> lib
> libexec
> share

Yes.

Regards,

Vincent.

> Regards,
> Katoch
> 
> On Tue, Sep 1, 2015 at 4:55 PM, Dinesh Guleria <din.gulu.er at gmail.com
> <mailto:din.gulu.er at gmail.com>> wrote:
> 
>     Thanks Thomas for your reply. I will use Sourcery CodeBench
>     2014.05 for time being.
> 
>     Build is taking some time. Will Get back to you.
> 
>     Thanks & Regards,
>     Katoch
> 
> 
> 
>     On Tue, Sep 1, 2015 at 12:28 PM, Thomas Petazzoni
>     <thomas.petazzoni at free-electrons.com
>     <mailto:thomas.petazzoni at free-electrons.com>> wrote:
> 
>         Dear Dinesh Guleria,
> 
>         On Tue, 1 Sep 2015 06:39:34 +0530, Dinesh Guleria wrote:
> 
>         > One more question from my side if i use " Sourcery
>         > CodeBench 2014.05"  toolchain then buildroot will download it for me or i
>         > have to download it manually ?
> 
>         Buildroot will download it for you.
> 
>         > Also if buildroot will download it then in
>         > this case will it be a one time process or if i make a new build for my
>         > rootfile system, then every time tool chain will be downloaded ?
> 
>         It is a one time process. Buildroot keeps a cache of the downloaded
>         files into the dl/ sub-directory (which can be customized using the
>         BR2_DL_DIR configuration option, which is also an environment
>         variable).
> 
>         > What exactly the diffrence between using external tool chain like Sourcery
>         > CodeBench 2014.05"  & building toolchain using crosstool-ng ?
>         > http://www.bootc.net/archives/2012/05/26/how-to-build-a-cross-compiler-for-your-raspberry-pi/
> 
>         Sourcery CodeBench 2014.05 is a pre-built toolchain, used by a
>         lot of
>         people. It's already there and available, hopefully quite well
>         tested.
>         However, since it's pre-built, you cannot customize it.
> 
>         Using crosstool-ng to build your toolchain allows to generate a
>         completely custom toolchain, tailored for your platform.
> 
>         > >> Building the rootfilesystem into zImage resolves the rootfilesystem
>         > loading/linking issue clearly.
>         >
>         > Will uboot be able to understand that my rootfilesystem is inside my zimage
>         > ? Or i have to tell uboot explicitly ?
> 
>         If you're using an initramfs bundled inside the zImage, then U-Boot
>         does not even need to know about it. Just load the zImage in U-Boot,
>         start the kernel, and that's it.
> 
>         Best regards,
> 
>         Thomas
>         --
>         Thomas Petazzoni, CTO, Free Electrons
>         Embedded Linux, Kernel and Android engineering
>         http://free-electrons.com
> 
> 
> 
> 
> 
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