[Buildroot] Advice on buildroot implementation

Arnout Vandecappelle arnout at mind.be
Tue Feb 19 23:18:50 UTC 2013

On 20/02/13 00:03, Gregory Perry wrote:
> Hello again,
> Does anyone have some advice on using buildroot to create a LiveCD filesystem?
> Here are the requirements:
> 1) Universal boot support on any x86 hardware platform;
> 2) Read only (UnionFS or OverlayFS); and
> 2) NFS root capabilities after kernel/initrd launch (if the ISO is PXE-boostrapped)

  On x86, I find the easiest approach to use a cpio initramfs, with a 
syslinux boot loader. But if universal boot is required, it means you 
have to stuff all the modules bloat in the cpio image...

  For basic boot you don't need unionfs. The NFS root you can have by 
combining the cpio initramfs with a unionfs overlay (assuming the 
initramfs contains all the modules and firmware). I posted a script 
recently [1] to mount a unionfs-root early in init. Don't forget to 
select the unionfs-fuse package.


[1] http://lists.busybox.net/pipermail/buildroot/2013-January/066146.html

> The problems I am seeing with this approach so far (at least from the NFS
> root perspective) is that things like /lib/firmware are not accessible during the
> boot process which hangs the boot process.
> Has anyone successfully created a buildroot install that can be used over a
> read only NFS mount?  How did you get around issues like eth0 firmware not
> being accessible during the initial boot?
> Thanks in advance
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Arnout Vandecappelle                          arnout at mind be
Senior Embedded Software Architect            +32-16-286500
Essensium/Mind                                http://www.mind.be
G.Geenslaan 9, 3001 Leuven, Belgium           BE 872 984 063 RPR Leuven
LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle
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