config: ext4: increase x86 rootfs size to 2GB to support online resize2fs

The current default rootfs size of 256MB in conjunction with 4K blocks
produces an ext4 filesystem which lacks the appropriate amount of backup GDT
entries to support online-resizing.

For x86 targets, increase the default rootfs size to 2048MB which allows
online resizing the filesystem to up to 2TB which is the current theoretical
maximum for LEDE, due to missing GPT support on the root block device.

Note that the filesystem artefact will not occupy 2GB on the build system as
the make_ext4fs utility uses sparse files to generate the filesystem images,
so the actual disk usage is much lower. Furthermore the filesystem images
are gzip compressed, shrinking them to only a few megabytes on the download

Signed-off-by: Jo-Philipp Wich <>
Acked-by: Michael Heimpold <>
Jo-Philipp Wich 8 years ago
parent d1ae4c4958
commit dc6cc04016

@ -253,7 +253,8 @@ menu "Target Images"
int "Root filesystem partition size (in MB)"
depends on GRUB_IMAGES || TARGET_ROOTFS_EXT4FS || TARGET_rb532 || TARGET_mvebu
default 256
default 2048 if TARGET_x86
default 256 if ! TARGET_x86
Select the root filesystem partition size.