LDSO_RUNPATH

LDSO_RUNPATH

bzhou 04 Jul 2008 19:26

I see Fry's has MBWE 500GB on sale (July 4th 3-day sale) for $129. Really tempting.

I have a couple of NAS boxes already, so I'll probably pass. Unless someone want to donate me one via nslu2-linux.org :-). Seriously, people happy with optware should consider donate to nslu2-linux. That's how we can pull resource together.

For optware, the big obstacle on MBWE is the lack of LDSO_RUNPATH in stock /lib/libuClibc-0.9.28.so
This is becoming more and more annoying as you often need to adjust /etc/ld.so.conf

I hope someone with the skill and determination can step up and fix this. I believe everything needed for this to happen is there. What's involved?

1. Read carefully http://www.ismprofessional.net/pascucci/documenti/mybook/mybook-hacking-en.html
2. Download WD GPL source
3. Build cross toolchain with provided buildroot, see #1 for config
4. Build uclibc with the cross toolchain, see #1 for config, make sure LDSO_RUNPATH is set to yes in uclibc config
5. Test the new uclibc by replacing /lib/libuClibc-0.9.28.so

Before making the change, make a backup of that file of course; and be prepared to take the hard disk out to recover if it's not working.

-Brian
bzhou at nslu2 dash linux dot org

Last edited on 04 Jul 2008 22:08 by bzhou Show more

Re: LDSO_RUNPATH

alephsmith 08 Sep 2008 11:30

Hi Brian,

Well I have muddled my way through setting up the toolchain and have enabled LDSO_RUNPATH.

So essentially I pull the /libuClibc-0.9.28.so from the arm toolchain and copy it over to my MyBook? Sorry if I sound a little vague, this is about as in depth as I have ever gone with linux.

Re: LDSO_RUNPATH

bzhou 08 Sep 2008 21:09

Hi alephsmith,

If you have built your own uClibc-0.9.28.so with LDSO_RUNPATH enabled, it should work by replacing /lib/libuClibc-0.9.28.so on you MBWE. As I said, be prepared to take the hard disk out and mount on another Linux PC to recover if it's not working. Wish you good luck.

From optware point of view, I'm more interested in the toolchain build procedure. If you can provide the procedure (either step-by-step or automated), I can work on a optware feed just for MBWE.

Best regards,

-Brian

Re: LDSO_RUNPATH

alephsmith 08 Sep 2008 22:50

OK. Seems to work fine.

The toolchain was relatively easy to build on Ubuntu (I had been struggling to get it to work on OS X for a while and finally gave up).

I haven't yet tried to build anything not included in the WD sources, however I don't think I'll run into any problems there.

I'll put together some instructions when I get a chance. Do you just need a step by step, or any other specific details? I would love to have an MBWE specific feed so I'm willing to bend over backwards for you :)

Re: LDSO_RUNPATH

bzhou 09 Sep 2008 02:28

That's great news. So you can confirm that you no longer need to use ldconfig?

A step-by-step for the toolchain would be fine.

The goal is to achieve the following (assuming we already have optware/platforms/{toolchain,packages}-mbwe.mk) :

svn co http://svn.nslu2-linux.org/svnroot/optware/trunk optware
cd optware; make mbwe-target
cd mbwe
make directories ipkg-utils
make toolchain
make hello-ipk    # or any package

The toolchain build happens at "make toolchain" stage using optware/platforms/toolchain-mbwe.mk, you can also see optware/platforms/toolchain-*.mk as example, esp. those using uclibc.

So, the more you can automate, the less work I need to do.

Last edited on 09 Sep 2008 02:30 by bzhou Show more

Re: LDSO_RUNPATH

alephsmith 10 Sep 2008 06:09

OK. I just tired the following test. I removed both transmission and gettext packages.

After reinstalling them, I was unable to start transmission because it couldn't find libintl.so.3. ldconfig fixed this.

This got me thinking, is uClib being built with my modified config. There is a second .config file called uClibc.config-locale and I have a feeling that this is being used, not the file I modified. I will try to rebuild the tool chain and see.

Last edited on 10 Sep 2008 06:31 by alephsmith Show more

Re: LDSO_RUNPATH

alllexx 11 Apr 2009 15:23

Hi Brian,
I've built the toolchain with LDSO_RUNPATH support and replaced the original libuClibc-0.9.28.so with cross-compiled one.

Using username "root".
root@192.168.1.206's password:
-bash: '/lib/libc.so.0' is not an ELF file
id: '/lib/libc.so.0' is not an ELF file
/bin/hostname: '/lib/libc.so.0' is not an ELF file
[root@WDStorage ~]# mc
mc: '/lib/libc.so.0' is not an ELF file #but did run ok
[root@WDStorage ~]# rm /etc/ld.so.conf
[root@WDStorage ~]# ldconfig
ldconfig: can't read header from /lib/libuClibc-0.9.28.so, skipping
[root@WDStorage ~]# mc
mc: can't load library 'libglib-2.0.so.0'

so, it appears that libuClibc-0.9.28.so alone is not sufficient to get LDSO_RUNPATH support right.
any ideas?
Alex

Last edited on 11 Apr 2009 15:25 by alllexx Show more

Re: LDSO_RUNPATH

bzhou 11 Apr 2009 15:32

I'm not sure, the "can't read header from /lib/libuClibc-0.9.28.so, skipping" message seems to indicate that the new libuClibc-0.9.28.so is corrupted.

Re: LDSO_RUNPATH

alllexx 11 Apr 2009 15:59

My uClibc configuration is identical to http://www.ismprofessional.net/pascucci/documenti/mybook/config/mybook-uClibc-1.1.config with the sole exception of enabling LDSO_RUNPATH support, so I have not a single clue about how to solve this problem

UPD: Yeah, it really got corrupted somehow. Now it's the same as what alephsmith reported, even though it's certain that uClibc was compiled with LDSO_RUNPATH enabled

Last edited on 11 Apr 2009 16:07 by alllexx Show more

Re: LDSO_RUNPATH

alllexx 11 Apr 2009 16:10

Perhaps, I should replace ld-uClibc-0.9.28.so as well?

UPD: I'll have to connect the drives to my linuxbox to try this out and now I'm a bit short on time, so it will have to wait a few hours

Last edited on 11 Apr 2009 16:16 by alllexx Show more

Re: LDSO_RUNPATH

alllexx 12 Apr 2009 04:47

Replaced ld-uClibc-0.9.28.so and have a dead MyBook now. It loosk like restore procedure is my only option as restoring original files doesn't help

LDSO_RUNPATH - solved

alllexx 15 Apr 2009 06:18

After all, I did manage to get LDSO_RUNPATH support right. It's pretty convinient not having to add all those lib dirs to ld.so.conf and "ldconfig"-ing:). To sum up, I messed up and the MyBook was unable to construct RAID on md1 (I have only one SATA USB suite, so had to deal with both drives separately).
Here are the libs http://rapidshare.com/files/221509857/lib.tar.gz.html
Note that you have to connect the drive(s) to your PC to rewrite the original ones in /lib. Don't forget to make backups and don't blame me if you screw your MBWE

Brian, are you still interested in the toolchain?

Last edited on 15 Apr 2009 08:46 by alllexx Show more