[Buildroot] jffs2 multiple partition

[Buildroot] jffs2 multiple partition

[Jonathan dumaresq]

Hi all,

I work with the atngw100 board and I try to build my custom linux fs with
buildroot. I try to figure out how to split the rootfs in 2 partitions. 

Is there a way to it it ? Or I must hack the target jffs2 ?

Regards

Jonathan

[Buildroot] jffs2 multiple partition

[Michael S. Zick]

On Wed November 25 2009, Jonathan dumaresq wrote:
> Hi all,
> 
> I work with the atngw100 board and I try to build my custom linux fs with
> buildroot. I try to figure out how to split the rootfs in 2 partitions. 
> 
> Is there a way to it it ? Or I must hack the target jffs2 ?
> 

Why not just write the build to a tar-ball?
Untar and divide up however you like before you write the files to jffs2?

mike
> Regards
> 
> Jonathan
> 
> _______________________________________________
> buildroot mailing list
> buildroot at busybox.net
> http://lists.busybox.net/mailman/listinfo/buildroot
> 
> 

[Buildroot] jffs2 multiple partition

[Jonathan dumaresq]

-----Message d'origine-----
De?: buildroot-bounces at busybox.net [mailto:buildroot-bounces at busybox.net] De
la part de Michael S. Zick
Envoy??: 25 novembre 2009 11:44
??: buildroot at busybox.net
Objet?: Re: [Buildroot] jffs2 multiple partition


> Is there a way to it it ? Or I must hack the target jffs2 ?
> 

Why not just write the build to a tar-ball?
Untar and divide up however you like before you write the files to jffs2?

Juste looking for an automatic way of doing it. I have check in Atmel
buildroot, and HCE Have modified the jffs2 part to be able to do it. I Just
wonder if the upstream had this possibilities ?

mike

[Buildroot] jffs2 multiple partition

[Thomas Petazzoni]

Le Wed, 25 Nov 2009 11:08:07 -0500,
"Jonathan dumaresq" <jdumaresq@cimeq.qc.ca> a ?crit :

> I work with the atngw100 board and I try to build my custom linux fs
> with buildroot. I try to figure out how to split the rootfs in 2
> partitions. 

How would like to split the rootfs ? I.e, what should Buildroot do to
split your rootfs ? What should be in the two different parts ?

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

[Buildroot] jffs2 multiple partition

[Jonathan dumaresq]

Hi Thomas,



-----Message d'origine-----
De?: buildroot-bounces at busybox.net [mailto:buildroot-bounces at busybox.net] De
la part de Thomas Petazzoni
Envoy??: 25 novembre 2009 16:25
??: buildroot at busybox.net
Objet?: Re: [Buildroot] jffs2 multiple partition

Le Wed, 25 Nov 2009 11:08:07 -0500,
"Jonathan dumaresq" <jdumaresq@cimeq.qc.ca> a ?crit :

> I work with the atngw100 board and I try to build my custom linux fs
> with buildroot. I try to figure out how to split the rootfs in 2
> partitions. 

How would like to split the rootfs ?
 I.e, what should Buildroot do to
split your rootfs ? What should be in the two different parts ?

I use the atngw100 board from atmel and We have 8M of parrallel flash and 8M
of serial flash. If the rootfs is > 8MB, I need to split the the rootfs. I
have looked in the ATMEL buildroot and from what I see, HCE have done some
work to ba able to do it. I just finished to port his work on my upstream
version of buildroot. 

The main idea is to put the usr part in the 8MB serial flash. 

I don't know if this is something that buildroot should offer ? if yes, I
can try to make a patch that add this functionality to buildroot ?

Jonathan

[Buildroot] jffs2 multiple partition

[Peter Korsgaard]

>>>>> "Jonathan" == Jonathan dumaresq <jdumaresq@cimeq.qc.ca> writes:

Hi,

 Jonathan> The main idea is to put the usr part in the 8MB serial flash.
 Jonathan> I don't know if this is something that buildroot should offer
 Jonathan> ? if yes, I can try to make a patch that add this
 Jonathan> functionality to buildroot ?  Jonathan

The question is how to generalize this and make is simple to
use/understand. My initial feeling is that for something as specialized
as this we should just make it easy to do outside BR (like we do with
the tarball target), instead of add a lot of complexity to BR/Kconfig.

But send the patch to the list once you're done, and I'll take a look at
it.

-- 
Bye, Peter Korsgaard

[Buildroot] jffs2 multiple partition

[Jonathan dumaresq]

Hi Peter, 

-----Message d'origine-----
De?: Peter Korsgaard [mailto:jacmet at gmail.com] De la part de Peter Korsgaard
Envoy??: 26 novembre 2009 09:37
??: Jonathan dumaresq
Cc?: 'Thomas Petazzoni'; buildroot at busybox.net
Objet?: Re: [Buildroot] jffs2 multiple partition

>>>>> "Jonathan" == Jonathan dumaresq <jdumaresq@cimeq.qc.ca> writes:

Hi,

 Jonathan> The main idea is to put the usr part in the 8MB serial flash.
 Jonathan> I don't know if this is something that buildroot should offer
 Jonathan> ? if yes, I can try to make a patch that add this
 Jonathan> functionality to buildroot ?  Jonathan

The question is how to generalize this and make is simple to
use/understand. My initial feeling is that for something as specialized
as this we should just make it easy to do outside BR (like we do with
the tarball target), instead of add a lot of complexity to BR/Kconfig.

But send the patch to the list once you're done, and I'll take a look at
it.

This is what I have. This looks to work. This is the first time I send a
patch... I will attach it to this email. If this is not right. Please let me
know. Since I take this from ATMEL buildroot, I take no credit for this ....

Jonathan

-- 
Bye, Peter Korsgaard

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[Buildroot] jffs2 multiple partition

[Thomas Petazzoni]

Le Thu, 26 Nov 2009 15:36:40 +0100,
Peter Korsgaard <jacmet@uclibc.org> a ?crit :

> The question is how to generalize this and make is simple to
> use/understand. My initial feeling is that for something as
> specialized as this we should just make it easy to do outside BR
> (like we do with the tarball target), instead of add a lot of
> complexity to BR/Kconfig.

Same opinion here. The feature ? put /usr in one filesystem and the rest
in another filesystem ? is very, very specific. Unless we find a way to
make it more generally useful, I don't think this belongs to Buildroot.

We could imagine that the user can give a text file saying which
file/directory should go in which filesystem, so that parts could be
put into a read-only filesystem and other parts into a read/write
filesystem. But I'm not sure how this would work.

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

[Buildroot] jffs2 multiple partition

[Jonathan dumaresq]

Hi Thomas,

-----Message d'origine-----
De?: buildroot-bounces at busybox.net [mailto:buildroot-bounces at busybox.net] De
la part de Thomas Petazzoni
Envoy??: 26 novembre 2009 10:13
??: buildroot at busybox.net
Objet?: Re: [Buildroot] jffs2 multiple partition

Same opinion here. The feature ? put /usr in one filesystem and the rest
in another filesystem ? is very, very specific. Unless we find a way to
make it more generally useful, I don't think this belongs to Buildroot.

Yes I know That this is very specific. To be honest, this is not funny at
all. But with the patch I just send, You can cherry pick some directory and
fill the jffs2_partition.txt file ans list those directory (or mount point)
in there. 

We could imagine that the user can give a text file saying which
file/directory should go in which filesystem, so that parts could be
put into a read-only filesystem and other parts into a read/write
filesystem. But I'm not sure how this would work.

This can be a realy fun !!!

Thomas
-- 

Jonathan

[Buildroot] jffs2 multiple partition

[Michael S. Zick]

On Thu November 26 2009, Jonathan dumaresq wrote:
> Hi Thomas,
> 
> -----Message d'origine-----
> De?: buildroot-bounces at busybox.net [mailto:buildroot-bounces at busybox.net] De
> la part de Thomas Petazzoni
> Envoy??: 26 novembre 2009 10:13
> ??: buildroot at busybox.net
> Objet?: Re: [Buildroot] jffs2 multiple partition
> 
> Same opinion here. The feature ? put /usr in one filesystem and the rest
> in another filesystem ? is very, very specific. Unless we find a way to
> make it more generally useful, I don't think this belongs to Buildroot.
> 
> Yes I know That this is very specific. To be honest, this is not funny at
> all. But with the patch I just send, You can cherry pick some directory and
> fill the jffs2_partition.txt file ans list those directory (or mount point)
> in there. 
> 
> We could imagine that the user can give a text file saying which
> file/directory should go in which filesystem, so that parts could be
> put into a read-only filesystem and other parts into a read/write
> filesystem. But I'm not sure how this would work.
> 
> This can be a realy fun !!!
> 
> Thomas

Perhaps like a "makedev table"?
Used as an "install command" target re-director?
Not that much different than using exclude-from-file and include-from-file
tar command options to reorganize the output tarball in user scripting.
Sounds like re-inventing an old, well known, wheel.

Hmm... Doesn't the build system already have an option to run things
through a user provided script?

Mike

[Buildroot] jffs2 multiple partition

[Peter Korsgaard]

>>>>> "Michael" == Michael S Zick <minimod@morethan.org> writes:

Hi,

 Michael> Perhaps like a "makedev table"?  Used as an "install command"
 Michael> target re-director?  Not that much different than using
 Michael> exclude-from-file and include-from-file tar command options to
 Michael> reorganize the output tarball in user scripting.  Sounds like
 Michael> re-inventing an old, well known, wheel.

Yes, exactly. It also shouldn't be jffs2 specific - E.G. you might want
the base system to be on squashfs, and "extra" stuff on jffs2.

 Michael> Hmm... Doesn't the build system already have an option to run things
 Michael> through a user provided script?

It does (BR2_ROOTFS_POST_BUILD_SCRIPT) - But that runs *BEFORE* the
target fs'es are created. You can ofcause do something like this
outside BR from the tarball target.

-- 
Bye, Peter Korsgaard