NI Linux Real-Time Documents

wirebirdlabs · ‎05-22-2014

Here are some notes taken while installing a package and configuring it to run in LabVIEW with a Call Library Function Node, both on a cRIO-9068 and a myRIO 1900.

All shell commands below are run from Terminal on OS X 10.9.2 and connected to the RIO target via WiFi on the local area network.

For the formatting below, both the shell commands and outputs use a monospace font, where the commands are bolded.

Let's establish a baseline: can we ping the RIO at its expected address?

Jacks-27-iMac:~ jackdunaway$ ping 192.168.0.20

PING 192.168.0.20 (192.168.0.20): 56 data bytes

64 bytes from 192.168.0.20: icmp_seq=0 ttl=64 time=62.983 ms

64 bytes from 192.168.0.20: icmp_seq=1 ttl=64 time=5.556 ms

64 bytes from 192.168.0.20: icmp_seq=2 ttl=64 time=25.158 ms

^C

Yes! Now, to establish a Secure Shell connection at this address, using the name "admin"

Jacks-27-iMac:~ jackdunaway$ ssh admin@192.168.0.20

The authenticity of host '192.168.0.20 (192.168.0.20)' can't be established.

RSA key fingerprint is 99:97:...redacted...:94:fa.

Are you sure you want to continue connecting (yes/no)? yes

Warning: Permanently added '192.168.0.20' (RSA) to the list of known hosts.

NI Linux Real-Time (run mode)

Log in with your NI-Auth credentials.

Password: (password, intially set when installing RIO software through NI-MAX)

admin@Wirebird-Labs-myRIO:~#

Now that we're logged in with root access, let's see what architectures our system supports:

admin@Wirebird-Labs-myRIO:~# opkg print-architecture

arch all 1

arch any 6

arch noarch 11

arch arm 16

arch armv4 21

arch armv5 26

arch armv5-vfp 31

arch armv5e 36

arch armv5e-vfp 41

arch armv6-vfp 46

arch armv7a 51

arch armv7a-vfp 56

arch armv7a-vfp-neon 61

arch xilinx_zynq 66

Those architectures appear to be editable from the following file, but I'm not sure what would happen if this was changed haphazardly. If you know, feel free to edit this document or comment below!

/etc/opkg/arch.conf

So after sifting around a while through all the available package repositories online, and comparing them against the default package listing specified inside the file /etc/opkg/angstrom-base-feed.conf -- I decided to update the base feed in that file to what appears to be the newest package repo listing for the armv7a-vfp-neon architecture (at the time of writing). The original package listing appeared to have packages from the 2010-2011 time frame, 3-4 years old or so. More importantly, that list was too old to even have the package I was looking for.

http://feeds.angstrom-distribution.org/feeds/v2012.12/ipk/eglibc/armv7a-vfp-neon/base

With the latest package listing selected, we can command opkg to update its local cache listing with that of the newly specified feed:

admin@Wirebird-Labs-myRIO:~# opkg update

Downloading http://feeds.angstrom-distribution.org/feeds/v2012.12/ipk/eglibc/armv7a-vfp-neon/base/Packages.gz.

Inflating http://feeds.angstrom-distribution.org/feeds/v2012.12/ipk/eglibc/armv7a-vfp-neon/base/Packages.gz.

Updated list of available packages in /var/lib/opkg/lists/angstrom-base.

My goal is to install a specific library, but the following command yielded a roadblock:

admin@Wirebird-Labs-myRIO:~# opkg install http://feeds.angstrom-distribution.org/feeds/v2012.12/ipk/eglibc/armv7a-vfp-neon/base/libjson-static...

Downloading http://feeds.angstrom-distribution.org/feeds/v2012.12/ipk/eglibc/armv7a-vfp-neon/base/libjson-static....

Installing libjson-staticdev (0.9-r0.7) to root...

libc6-dev: unsatisfied recommendation for eglibc-thread-db-dev

libc6-dev: unsatisfied recommendation for perl-dev

libc6-dev: unsatisfied recommendation for libsegfault-dev

bash-dev: unsatisfied recommendation for ncurses-libtinfo-dev

ncurses-dev: unsatisfied recommendation for ncurses-libmenu-dev

ncurses-dev: unsatisfied recommendation for ncurses-libpanel-dev

ncurses-dev: unsatisfied recommendation for ncurses-libtinfo-dev

ncurses-dev: unsatisfied recommendation for ncurses-libform-dev

ncurses-dev: unsatisfied recommendation for ncurses-libncursesw-dev

ncurses-dev: unsatisfied recommendation for ncurses-libtic-dev

ncurses-dev: unsatisfied recommendation for ncurses-libncurses-dev

ncurses-dev: unsatisfied recommendation for ncurses-libmenuw-dev

ncurses-dev: unsatisfied recommendation for ncurses-terminfo-base-dev

ncurses-dev: unsatisfied recommendation for ncurses-libpanelw-dev

ncurses-dev: unsatisfied recommendation for ncurses-libformw-dev

ncurses-dev: unsatisfied recommendation for ncurses-libticw-dev

libc6-dev: unsatisfied recommendation for eglibc-extra-nss-dev

libc6-dev: unsatisfied recommendation for libcidn-dev

Collected errors:

* satisfy_dependencies_for: Cannot satisfy the following dependencies for libjson-staticdev:

* libc6 (>= 2.16) * libc6 (>= 2.16) * libc6 (>= 2.16) * libc6 (>= 2.16) * libc6 (= 2.16-r15+svnr20393.5) * libc6 (>= 2.16) * libc6 (>= 2.16) * libc6 (>= 2.16) * libc6 (>= 2.16) * libc6 (>= 2.16) * libc6 (>= 2.16) * libc6 (>= 2.16) * libc6 (>= 2.16) * libc6 (>= 2.16) * libc6 (>= 2.16) * libc6 (>= 2.16) * libc6 (>= 2.16) * libc6 (>= 2.16) *

Looks like this package requires a later version of libc6 than what ships with the stock installation, so let's see what version we currently have installed:

admin@Wirebird-Labs-myRIO:~# opkg list | grep libc6

libc6 - 2.16-r15+svnr20393.5 - Embedded GLIBC (GNU C Library)

libc6 - 2.11.1-r7

libc6-dev - 2.16-r15+svnr20393.5 - Embedded GLIBC (GNU C Library) - Development files

So looks like we have the option to upgrade from 2.11 to 2.16, which would satisfy the constraint (tip from BradM from the comments below: Be careful with this, we've seen this clear out the /etc/ld.so.conf file, meaning NI software will fail to load on next boot. There's a reason we flagged it to not get updated accidentally.😞

admin@Wirebird-Labs-myRIO:~# opkg upgrade libc6

Not upgrading package libc6 which is marked hold (flags=0x2).

At this point, we're feeling much like a Reverse Polish Notation calculator, pushing all this work onto the stack... but whatev, let's lift the flag to allow the upgrade:

admin@Wirebird-Labs-myRIO:~# opkg flag ok libc6

Setting flags for package libc6 to ok.

Attempting the upgrade once more yields success:

admin@Wirebird-Labs-myRIO:~# opkg upgrade libc6

Upgrading libc6 on root from 2.11.1-r7 to 2.16-r15+svnr20393.5...

Downloading http://feeds.angstrom-distribution.org/feeds/v2012.12/ipk/eglibc/armv7a-vfp-neon/base//libc6_2.16-r1....

Removing obsolete file /lib/libutil-2.11.1.so.

Removing obsolete file /lib/libnsl-2.11.1.so.

Removing obsolete file /usr/libexec/getconf/XBS5_ILP32_OFFBIG.

Removing obsolete file /usr/libexec/getconf/XBS5_ILP32_OFF32.

Removing obsolete file /lib/libnss_dns-2.11.1.so.

Removing obsolete file /usr/libexec/getconf/POSIX_V7_ILP32_OFFBIG.

Removing obsolete file /lib/libc-2.11.1.so.

Removing obsolete file /usr/libexec/getconf/POSIX_V7_ILP32_OFF32.

Removing obsolete file /lib/libm-2.11.1.so.

Removing obsolete file /lib/librt-2.11.1.so.

Removing obsolete file /lib/libnss_compat-2.11.1.so.

Removing obsolete file /lib/libresolv-2.11.1.so.

Removing obsolete file /lib/libanl-2.11.1.so.

Removing obsolete file /lib/libcrypt-2.11.1.so.

Removing obsolete file /lib/libpthread-2.11.1.so.

Removing obsolete file /usr/libexec/getconf/POSIX_V6_ILP32_OFFBIG.

Removing obsolete file /lib/libnss_files-2.11.1.so.

Removing obsolete file /lib/ld-2.11.1.so.

Removing obsolete file /usr/libexec/getconf/POSIX_V6_ILP32_OFF32.

Removing obsolete file /lib/libBrokenLocale-2.11.1.so.

Removing obsolete file /lib/libdl-2.11.1.so.

Configuring libc6.

Alright, now let's make sure that original package we're wanting is still in the local cache...

admin@Wirebird-Labs-myRIO:~# opkg list | grep json

libjson-dev - 0.9-r0.7 - libjson version 0.9-r0 - Development files

libjson-staticdev - 0.9-r0.7 - libjson version 0.9-r0 - Development files (Static Libraries)

libjson0 - 0.9-r0.7 - libjson version 0.9-r0

And let's have a go at installing it, this time, from its local package name, rather than specifying it's fully-qualified hosted URI:

admin@Wirebird-Labs-myRIO:~# opkg install libjson-dev

Installing libjson-dev (0.9-r0.7) to root...

Downloading http://feeds.angstrom-distribution.org/feeds/v2012.12/ipk/eglibc/armv7a-vfp-neon/base//libjson-dev_0....