[Buildroot] Need help with genimage
Jörg Krause
joerg.krause at embedded.rocks
Sun Jan 8 19:07:28 UTC 2017
On Sun, 2017-01-08 at 21:02 +0200, Baruch Siach wrote:
> Hi Jörg,
>
> On Sun, Jan 08, 2017 at 07:32:37PM +0100, Jörg Krause wrote:
> > On Sun, 2017-01-08 at 19:45 +0200, Baruch Siach wrote:
> > > On Sun, Jan 08, 2017 at 12:58:51PM +0100, Jörg Krause wrote:
> > > > I am able to generate the sd card image and copy it to the sd
> > > > card
> > > > using Suses imagewriter. The board boots fine. However, the
> > > > rootfs
> > > > size
> > > > is not 512MB as expected:
> > > >
> > > > # df -hT
> > > > Filesystem Type Size Used Available
> > > > Use%
> > > > Mounted on
> > > > /dev/root ext4 38.7M 37.9M 0
> > > > 100%
> > > > /
> > > > devtmpfs devtmpfs 501.9M 0 501.9M
> > > > 0%
> > > > /dev
> > > > tmpfs tmpfs 502.4M 0 502.4M
> > > > 0%
> > > > /dev/shm
> > > > tmpfs tmpfs 502.4M 3.9M 498.4M
> > > > 1%
> > > > /tmp
> > > > tmpfs tmpfs 502.4M 24.0K 502.4M
> > > > 0%
> > > > /run
> > > >
> > > > I am not able to create any file larger file on the filesystem
> > > > nor
> > > > start some programs.
> > > >
> > > > What am I missing here? Can somebody enlighten me please :-)
> > >
> > > Unless you set BR2_TARGET_ROOTFS_EXT2_BLOCKS and
> > > BR2_TARGET_ROOTFS_EXT2_INODES
> > > you'll get a minimal ext2/3/4 filesystem with no free space.
> > > Alternatively,
> > > you may run on target the resize2fs tool from the e2fsprogs
> > > package
> > > on the
> > > root filesystem to expand the filesystem to the size of the
> > > partition.
> >
> > Which values should I use for blocks and inodes if I set the rootfs
> > size to 512M in genimage.cfg? Any suggestions?
>
> The Buildroot package/mke2img/mke2img script assumes a 1KB block
> size, so you
> need 512K blocks.
>
> The number of inodes determines the number of file entries in the
> filesystem.
> A safe "inode ratio" default is one inode per 16384 bytes. That is
> the native
> e2fsprogs package mke2fs tool default, but YMMV.
I see! Many thanks!
I wonder why only one defconfig (nanopi_neo) is setting the blocks and
inodes. However, maybe it's best to enable the resize2fs package by
default in the defconfig and add a comment in the readme of the board.
Jörg
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