26.7. BR2_TARGET_ROOTFS_EXT2_SIZE
When adding new large package to the Buildroot root filesystem, it may fail with the message:
Maybe you need to increase the filesystem size (BR2_TARGET_ROOTFS_EXT2_SIZE)
The solution is to simply add:
./build-buildroot --config 'BR2_TARGET_ROOTFS_EXT2_SIZE="512M"'
where 512Mb is "large enough".
Note that dots cannot be used as in 1.5G, so just use Megs as in 1500M instead.
Unfortunately, TODO we don’t have a perfect way to find the right value for BR2_TARGET_ROOTFS_EXT2_SIZE. One good heuristic is:
du -hsx "$(./getvar --arch arm buildroot_target_dir)"
Some promising ways to overcome this problem include:
-
SquashFS TODO benchmark: would gem5 suffer a considerable disk read performance hit due to decompressing SquashFS?
-
libguestfs: https://serverfault.com/questions/246835/convert-directory-to-qemu-kvm-virtual-disk-image/916697#916697, in particular
vfs-minimum-size -
use methods described at: Section 24.6.3, “gem5 checkpoint restore and run a different script” instead of putting builds on the root filesystem