mirrors/poky
1
0
Fork 0
mirror of https://git.yoctoproject.org/poky synced 2026-05-09 05:29:32 +00:00
Code Issues Projects Releases Wiki Activity

busybox: avoid circular dependency when using initramfs

Browse Source 
The kernel does not automatically mount devtmpfs when using initramfs
based booting (even when using CONFIG_DEVTMPFS_MOUNT). If the rootfs
is built with USE_DEVFS=1 (which is the default), the system ends up
with a completely empty /dev to begin with.

Busybox uses the first entry in inittab slightly different than
other init systems:
<id>: WARNING: This field has a non-traditional meaning for BusyBox init!

The id field is used by BusyBox init to specify the controlling tty for
the specified process to run on.  The contents of this field are
appended to "/dev/" and used as-is.

Since /dev/null is not there yet, Busybox throws errors instead of
executing the commands, and hence never mounts devtmpfs:
init started: BusyBox v1.24.1 (2016-09-04 11:53:14 PDT)
can't open /dev/null: No such file or directory
can't open /dev/null: No such file or directory
can't open /dev/null: No such file or directory
can't open /dev/null: No such file or directory
can't open /dev/null: No such file or directory
can't open /dev/null: No such file or directory
can't open /dev/null: No such file or directory

Avoid this circular dependency by not specifing <id>. With that
Busybox ends up using the stdio of the init process and executes
the inittab just fine.

(From OE-Core rev: 82de49b899bca915259ea7ea149f50e1401c2426)

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Stefan Agner
2016-09-04 13:25:55 -07:00
committed by Richard Purdie
parent b4f2c760aa
commit a477fcd752
1 changed files with 7 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files
meta/recipes-core/busybox/files/inittab
+7 -7
View File
@@ -1,13 +1,13 @@
# This is run first except when booting in single-user mode.
# Startup the system
null::sysinit:/bin/mount -t proc proc /proc
null::sysinit:/bin/mount -t sysfs sysfs /sys
null::sysinit:/bin/mount -t devtmpfs devtmpfs /dev
null::sysinit:/bin/mount -o remount,rw /
null::sysinit:/bin/mkdir -p /dev/pts
null::sysinit:/bin/mount -t devpts devpts /dev/pts
null::sysinit:/bin/mount -a
::sysinit:/bin/mount -t proc proc /proc
::sysinit:/bin/mount -t sysfs sysfs /sys
::sysinit:/bin/mount -t devtmpfs devtmpfs /dev
::sysinit:/bin/mount -o remount,rw /
::sysinit:/bin/mkdir -p /dev/pts
::sysinit:/bin/mount -t devpts devpts /dev/pts
::sysinit:/bin/mount -a
::sysinit:/etc/init.d/rcS