[Buildroot] Qt5 build failure (beaglebone_qt5_defconfig)

[Thomas Petazzoni <thomas.petazzoni@free-electrons.com>]

Hello,

On Thu, 6 Apr 2017 18:12:15 +0200, Michael Nazzareno Trimarchi wrote:

> '/home/michael/work/amarula/bticino/buildroot/output/build/linux-52c4aa7cdb93d61f8008f380135beaf7b8fa6593'
>   DTC     arch/arm/boot/dts/am335x-bone.dtb
>   DTC     arch/arm/boot/dts/am335x-evm.dtb
> make[2]: *** No rule to make target
> 'arch/arm/boot/dts/am335x-bonegreen.dtb'.  Stop.
> arch/arm/Makefile:314: recipe for target 'am335x-bonegreen.dtb' failed

This is caused by the recent commit
https://git.buildroot.org/buildroot/commit/configs?id=4b2440b7dcc68369548c0f2be6984fe645fc6bb0
from Matthias Fritzsche. Matthias, are you sure you tested the
beaglebone_qt5_defconfig ?

Indeed, beaglebone_defconfig and beaglebone_qt5_defconfig don't use the
same kernel version, and the one used in beaglebone_qt5_defconfig
doesn't have the Beagle Bone Green Device Tree.

So either we should revert Matthias patch on beaglebone_qt5_defconfig,
or someone tests upgrading beaglebone_qt5_defconfig to the same kernel
version as the one used in beaglebone_defconfig.

> chmod a+x /home/michael/work/amarula/bticino/buildroot/output/build/_fakeroot.fs
> PATH="/home/michael/work/amarula/bticino/buildroot/output/host/bin:/home/michael/work/amarula/bticino/buildroot/output/host/sbin:/home/michael/work/amarula/bticino/buildroot/output/host/usr/bin:/home/michael/work/amarula/bticino/buildroot/output/host/usr/sbin:/opt/OpenPrinting-Gutenprint/sbin:/opt/OpenPrinting-Gutenprint/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/usr/lib/jvm/java-7-oracle/bin:/usr/lib/jvm/java-7-oracle/db/bin:/usr/lib/jvm/java-7-oracle/jre/bin"
> /home/michael/work/amarula/bticino/buildroot/output/host/usr/bin/fakeroot
> -- /home/michael/work/amarula/bticino/buildroot/output/build/_fakeroot.fs
> rootdir=/home/michael/work/amarula/bticino/buildroot/output/target
> table='/home/michael/work/amarula/bticino/buildroot/output/build/_device_table.txt'
> genext2fs: couldn't allocate a block (no free space)
> fs/ext2/ext2.mk:44: recipe for target

This is due to the fact that we removed auto-calculation of the ext4
filesystem size in
https://git.buildroot.org/buildroot/commit/?id=c6bca8cef0310bc649240b451989457ce94a8358,
and we default to 60 MB for the filesystem size, which is not enough
for this demo. Fixing this is simple: send a patch that adds:

BR2_TARGET_ROOTFS_EXT2_BLOCKS="126976"

to beaglebone_qt5_defconfig (of course after testing that this size is
sufficient).

Thanks!

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com