[Buildroot] problem when using build cache ?

[Buildroot] problem when using build cache ?

[Sagaert Johan]

Hi

 

Using 2011.11 :

 

The udev version in 2011.11 (v1.73) does not  generate the /dev/pts nodes  and as result there is no devpts in the mounts.

 

The dev/pts is needed if you want to access the box via telnet.

 

So I went back to udev 1.14 (package stolen from buildroot 2010.11 )

 

I noticed udev 1.14 does not build  when the build ccache is ON.

Without the build ccache it's ok.

 

Has this something to do with the fact that the udev 1.14 package makefile is different in structure then the structure used in
2011.11 ?

 

If you check the udev doc, it states that udev 1.73 only works with kernels >= 2.6.34

But I was using 2.6.36.1 and there where no /dev/pts nodes 

 

So there is a tight connection between udev versions and the kernel versions.

 

Regards.

 

Sagaert Johan

 

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[Buildroot] problem when using build cache ?

[Peter Korsgaard]

>>>>> "Sagaert" == Sagaert Johan <sagaert.johan@skynet.be> writes:

 Sagaert> Hi
 Sagaert> Using 2011.11 :

 

 Sagaert> The udev version in 2011.11 (v1.73) does not  generate the /dev/pts nodes  and
 Sagaert> as result there is no devpts in the mounts.

No, but the default /etc/inittab has a mkdir -p /dev/pts
 
 Sagaert> Has this something to do with the fact that the udev 1.14
 Sagaert> package makefile is different in structure then the structure
 Sagaert> used in 2011.11 ?

Perhaps.
 

 Sagaert> If you check the udev doc, it states that udev 1.73 only works with kernels >=
 Sagaert> 2.6.34

 Sagaert> But I was using 2.6.36.1 and there where no /dev/pts nodes

  Sagaert> So there is a tight connection between udev versions and the
 Sagaert> kernel versions.

The /dev/pts issue isn't directly related to udev or the kernel, simply
that devtmpfs doesn't create that mount point (and it shouldn't as no
device drivers tells it to do so).

-- 
Bye, Peter Korsgaard

[Buildroot] problem when using build cache ?

[Sagaert Johan]

Hi

After some search i found that if you create a directory under /lib/udev/devices/pts  then udev will create(copy) this directory
under /dev so I think its not needed to do it in inittab.

Johan

-----Oorspronkelijk bericht-----
Van: Peter Korsgaard [mailto:jacmet at gmail.com] Namens Peter Korsgaard
Verzonden: dinsdag 31 januari 2012 17:24
Aan: Sagaert Johan
CC: buildroot at busybox.net
Onderwerp: Re: problem when using build cache ?

>>>>> "Sagaert" == Sagaert Johan <sagaert.johan@skynet.be> writes:

 Sagaert> Hi
 Sagaert> Using 2011.11 :

 

 Sagaert> The udev version in 2011.11 (v1.73) does not  generate the /dev/pts nodes  and
 Sagaert> as result there is no devpts in the mounts.

No, but the default /etc/inittab has a mkdir -p /dev/pts
 
 Sagaert> Has this something to do with the fact that the udev 1.14
 Sagaert> package makefile is different in structure then the structure
 Sagaert> used in 2011.11 ?

Perhaps.
 

 Sagaert> If you check the udev doc, it states that udev 1.73 only works with kernels >=
 Sagaert> 2.6.34

 Sagaert> But I was using 2.6.36.1 and there where no /dev/pts nodes

  Sagaert> So there is a tight connection between udev versions and the
 Sagaert> kernel versions.

The /dev/pts issue isn't directly related to udev or the kernel, simply
that devtmpfs doesn't create that mount point (and it shouldn't as no
device drivers tells it to do so).

-- 
Bye, Peter Korsgaard

[Buildroot] problem when using build cache ?

[Peter Korsgaard]

>>>>> "Sagaert" == Sagaert Johan <sagaert.johan@skynet.be> writes:

 Sagaert> Hi
 Sagaert> After some search i found that if you create a directory under /lib/udev/devices/pts  then udev will create(copy) this directory
 Sagaert> under /dev so I think its not needed to do it in inittab.

It is for non-udev builds, so it makes most sense to to it in
/etc/inittab.

-- 
Bye, Peter Korsgaard

[Buildroot] problem when using build cache ?

[Thomas Petazzoni]

Hello,

Le Tue, 31 Jan 2012 17:10:46 +0100,
"Sagaert Johan" <sagaert.johan@skynet.be> a ?crit :

> The udev version in 2011.11 (v1.73) does not  generate the /dev/pts nodes  and as result there is no devpts in the mounts.

I guess you're talking about version 173 of udev, there is no such
thing as 1.73. If you use udev, then your kernel must have
CONFIG_DEVTMPFS and CONFIG_DEVTMPFS_MOUNT enabled. If you let Buildroot
build your kernel, then Buildroot will automatically ensure that your
kernel is configured with those two options enabled. If you build your
kernel manually outside of Buildroot, then you must enable those
options, otherwise udev will not work.

I guess this is where your problem is: check your kernel configuration.

> I noticed udev 1.14 does not build  when the build ccache is ON.

Honestly, we don't really care about udev 114 since the current
Buildroot version contains udev 173, and this one appears to build
properly with ccache enabled.

Regards,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com