How to set minimum/specific rootfs size in buildroot

Question

I am using buildroot 2016.02 and building for the Raspberry Pi 2. After I boot the system I have very little free space on /.

How can I specify that I want the rootfs size to be a specific size like 1 GB?

If this is not possible, does anyone know which part of the build process generates the rootfs.ext4 file so that I could modify it?

score 3 · Answer 1 · answered Apr 09 '16 at 18:11

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I found the options under "Filesystem Images" in make menuconfig. I used "extra size in blocks" and it did what I was expecting.

answered Apr 09 '16 at 18:11

user3091850

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This solution seems obsolete now with buildroot 2021.02.2. See the one from @peterh (BR2_TARGET_ROOTFS_EXT2_SIZE key). – Ek1noX Jun 04 '21 at 13:13

score 2 · Answer 2 · edited Feb 05 '18 at 09:01

2

BR2_TARGET_ROOTFS_EXT2_SIZE="120M"

Add this line in your defconfig to set 120 MB size, or you can manually change in "make menuconfig" after firing "make foo_defconfig", and before firing "make".

edited Feb 05 '18 at 09:01

peterh

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answered Feb 05 '18 at 08:40

DragonPup

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How to set minimum/specific rootfs size in buildroot

2 Answers2