Joachim Wiberg, née Nilsson

UNIX developer with a passion for style and simplicity, down to the last bit

Education

1999—2000

MSc, Real-Time Systems, Computer Engineering; University of Mälardalen, MdU (Västerås)

Thesis title: Modular Scheduling in RTLinux, supervisors: Prof. Gerhard Fohler, MdU, and Mikael Bergqvist, Frontec AB

1995—1999

BSc, Computer Engineering; University of Mälardalen, MdU (Västerås)

Experience

2022—Present: Addiva Elektronik AB

Software Architect and embedded systems consultant.

In-house project for an embedded controller (nRF5340) writing a firmware based on the Zephyr embedded real-time OS. Including porting libmbus (a meter-bus implementation) to Zephyr.
Consultant at Transrail AB, writing a CIP adapter based on the OpENer stack. Including developing two CIP scanners for automated tests
Consultant at Westermo R&D. Linux kernel upgrade work, including adapting and writing new drivers, as well as submitting patches to the Linux networking subystem.

2005—2022: Westermo R&D

Software Architect for WeOS, later System Archictect, Westermo Network Technologies AB, at Research & Development in Västerås, Sweden.

Invented, engineered, named, and designed the WeOS network operating system. An in-house embedded Linux distribution with CLI, WebUI, SNMP
Wrote an IGMP v2/v3 snooping daemon for Marvell SOHO switch cores
Designed a redundant Layer-2 ring-bridging fail-over protocol
Introduced advanced version control using Subversion (now GIT is used)
Introduced collaborative issue tracking using Mantis
Systems administration for Linux servers
Project lead and scrum master
Subsystem maintainer of OSPF, RIP, DHCP (server/relay/client), IGMP snooping, multicast and unicast routing, and more in WeOS.
Free/Open Source process responsible

2002—2005: Ångpanneföreningen, ÅF

Consultant, Linux and embedded systems, at ÅF-System AB, Västerås

2004

ABB Force Measurement — Network Security Analysis

Security analysis and firewall recommendations for connecting an office network, with Internet access, to a time critical industrial network with high demands on network load predictability and quality of service.

2002–2005

EssNet AB — Linux USB drivers

Development of several Linux kernel device drivers for a highly advanced lottery system. In particular a Cypress FX2 (USB 2.0) based high–speed scanner with functions for scanning, calibration, branding of printed receipts, cashdrawer and dedicated serial port interface.

First developed for Linux kernel 2.4 and later ported to Linux 2.6.

Also responsible for continous maintenance of drivers and Linux system software.

2000—2002: RealFast Operating Systems

R&D Engineer, RealFast Operating Systems AB, Västerås.

2002

Mentor Graphics Inc. — Port Linux to HW microkernel

Similar to the VxWork project, but for the Linux kernel using the RealFast HW microkernel. Testbench (SW simulator of microkernel), complete system w/ drivers, redesign of the Linux scheduler etc., fully developed in a GNU/Linux environment.

Development was done on the ARM Integrator platform using the Arm AxD debugger with a MultiICE JTAG probe.

2001

Mälardalen University, Västerås — Lecturer

Lecturer and examiner for a course in C programming at the Department of Computer Engineering, IDt. http://www.idt.mdh.se/kurser/cd5020/jnnht01/

2001

RealFast/Mälardalens Högskola, Västerås — Sierra S16

Project lead and developer for the Sierra real-time operating sytem. A minimalistic OS based on the RealFast HW microkernel wrapped with a small API to the hardware, coupled with GCC and an adaptation of NewLib to provide a limited C library. Used in courses given at Mälardalen University, e.g. Sumo robots.

2001

Ericsson Radio Systems AB, Nacka Strand — RTLinux Demo

Investigation and demonstration of how Linux, and RTLinux in particular, RTLinux can replace Enea OSE in Ericsson telephone switches based on the GPB2, General Purpose Board 2.

2001

Applied Linux & Embedded Internet Show, 5th April, Kista — Presenter

Presented Linux and other free kernels for embedded and real-time systems. Overview of non-realtime eCos and uClinux, as well as the real-time RTLinux and RTAI. Elaborated on how each could be used, strengths and weaknesses, and what to watch out for.

2000

Ericsson Mobile, Gothenburg — Port VxWorks to HW microkernel

Extensive modifications of the VxWorks operating system internals, the Wind microkernel, to support the HW microkernel developed by RealFast, a VHDL kernel core prototyped on a PMC card using an FPGA.

Performance of VxWorks packet forwarding was evaluated with and without the hardware acceleration on the Ericsson GIC (General Interface Carrier) board using an advanced IP packet generator.

Also, debugging and auditing of Ericsson drivers and base platform for the IBM PowerPC 750 using IBM RISCWatch, SingleStep, and Vmetro PCI bus analyzer.

2000–2002

RealFast — internal work

Network and systems administration of Linux, OpenBSD and Solaris machines: maintenance, version control systems, file servers, backup, etc.

Technical Experience

Extensive knowledge of UNIX, systems administration and development. Intimate knowledge of C, Make and the GNU configure & build system. Intermediate knowledge of Python, Perl, Lua, and C++.

Some Open Source projects maintained at https://github.com/troglobit:

finit

A fast init with process supervision, plugin system, and conditions. Focused on small and embedded systems, yet fully usable on server and desktop installations. Used in Westermo WeOS, a network operating system.

https://github.com/troglobit/finit

uftpd

Simple FTP/TFTP server

FTP with basic anonymous support
TFTP with block-size negotiation for increased xfer speed

https://github.com/troglobit/uftpd

watchdogd

Advanced watchdog daemon for Linux. Supports loadavg, file descriptor and RAM usage monitoring. Also, advanced heartbeat monitoring API for process instrumentation and supervision.

https://github.com/troglobit/watchdogd

libuEv