JAY YORK

jyork999 A@T comcast D.O.T net

OBJECTIVE

Seeking challenging computer programming work involving UNIX kernel internals and device drivers.

SUMMARY

Twenty years of solid engineering experience developing quality hardware-intensive, real-time, concurrent software in C language for embedded systems and UNIX. Career focus has been on challenging work in a high-powered team environment using state of the art technologies for commercial applications. Recent focus has been on developing software for data communications and data storage systems.

EXPERTISE

Languages - C; familiar with Assembly, C++, Java, Lex, Yacc.

Processors - PowerPC, Xscale ARM; familiar with MIPS, SPARC, 68000, x86 family.

Systems - Linux, Solaris, Mac OS X, FreeBSD, SunOS, System V, OS-9.

Drivers - SCSI (block, char, ioctl), PCI (backplane, target), Ethernet (network), telephony (streams), serial (char, tty).

I/O Access - Descriptor Chain Lists, Single Block DMA, Interrupt Driven, Polled Mode.

Busses - PCI; familiar with VME, ISA.

Protocols - RapidIO, SCSI, HTTP, Telnet, FTP, UDP, IP, ICMP, Ethernet, IEEE 802.3, HDLC, LAPB, RS-232, RS-422, RS-485, EIA-530; familiar with TCP, GRE, Sonet OC-3, T1.

IPC - message queues, semaphores, shared memory, FIFOs, pipes, signals, sockets.

Tools - sh, grep, tr, sed, awk, lex, yacc, troff, latex, doxygen, pic, svn, cvs, sccs, make, ddd, gdb, diff, patch, tar, cpio, pkg*; familiar with csh, egrep, perl, fig, rcs, adb, dbx, rpm, dpkg.

Quality Measures - familiar with SEI CMM, ISO 9000.

EXPERIENCE

06/09 to 09/09 - Contract Software Engineer - DDC, Gaithersburg, MD

Keywords: ARM, Xscale, OMAP, PowerPC, PPC, LSP, BSP, GPIO, JTAG, I2C, IIC, SPI, Linux, Board Support, Kernel, Device drivers

worked on several custom FPGA programming device drivers
worked on several custom I2C based device drivers
determined source code basis for previously compiled object modules

07/08 to 05/09 - Contract Software Engineer - 3ETI/E.F. JOHNSON, Rockville, MD

Keywords: NIST, FIPS 140-2, CAVS, CAVP, PCI, Monta Vista Linux 2.1, Linux kernel 2.4.17, Linux kernel 2.6.22, ARM, Xscale, LSP, BSP, MTD

worked on custom Intel Xscale IXP425 based inline wired crypto bridge devices, Mini PCI crypto engines, and wireless crypto access point and gateway devices
performed requirements decomposition for NIST FIPS 140-2 Cryptographic Algorithm Validation of Intel Crypto Libraries
implemented wrapper software to perform cryptographic algorithm validation testing of wired inline crypto bridge device
analyzed PCI-SIG interface requirements for Mini PCI target adapter device
wrote software to do hardware proveout to verify correct functioning of Mini PCI crypto engine hardware design in PCI target mode.
reverse engineered and documented custom boot and build prcoesses for existing devices
ported Linux kernel 2.6.22 to existing crypto access point and gateway device, which was based on Linux kernel 2.4.17-mvl21

05/08 to 07/08 - Contract Software Engineer - JUNIPER NETWORKS, Frederick, MD

Keywords: Embedded, CompactPCI, Fedora Core 1, Linux kernel 2.4.29, network device drivers, PCI device drivers

Worked on integrating voice compression engine into custom driver framework

05/07 to 10/07 - Contract Software Engineer - HUGHES NETWORK SYSTEMS, Gaithersburg, MD

Keywords: Monta Vista Linux 4, Linux kernel 2.6.10, U-boot 1.1.6, AMCC PPC 440GX, Xilinx Virtex 4 FPGA, Xilinx Virtex 5 FPGA, ATCA, RapidIO, character device drivers

Wrote interrupt-driven character device driver for general purpose AMCC PPC 440GX External Bus Controller access
Wrote character device driver for Xilinx Virtex FPGA Selectmap Configuration and Readback
Wrote character device driver for custom satellite communications FPGA access
Wrote character device driver for Serial RapidIO System Bring Up
Oversaw U-boot changes for custom hardware
Oversaw Linux support package changes for custom hardware
Oversaw the writing of an interrupt driven character device driver for general purpose AMCC PPC 440GX GPIO access
Wrote PPC-FPGA software/firmware/hardware interface document
Wrote device driver design document
Participated in reviews of software, firmware, and hardware design documents
Critiqued engineering design process, made concrete suggestions for improvement

08/06 to 09/06 - Contract Software Engineer - SEPATON, (through Triple Crown), Marlboro, MA

Keywords: Linux kernel 2.4.32, x86

Integrated kernel mode Hifn compression device driver into existing virtual tape library system.
Built custom adapter from readily available COTS parts for serial debug port

11/05 to 08/06 - Contract Software Engineer - DIGI-DATA CORP. (through Latitude), Columbia, MD

Keywords: Monta Vista Linux 4, Linux kernel 2.6.10, MIPS R7000, block device driver, RAID 5, SCSI target mode

Provided Linux expertise to move development of existing RAID 5 fibre channel controller from MS-Windows hosts and VxWorks targets, to SuSE Linux hosts and Monta Vista Linux targets.

ported SCST SCSI Target mode Qlogic driver to big-endian MIPS
maintained LSP from kernel revision 2.6.10 to kernel revision 2.6.16
created rudimentary network setup, including subversion repository and server, DHCP server, DNS server, HTTP server, NFS server, PXE boot server, package-install server, and software-update server
created web-based system for establishing, documenting, and publishing development procedures
documented Linux kernel 2.6 Block I/O, RAID, SCSI Initiator, Fibre Channel, and SCST SCSI Target modules
enhanced kernel debug facilities by adding interrupt signalling support
provided architectural, design, and implementation advice on the porting of existing software

2/05 to 11/05 - on sabbatical

Worked on several projects of my own interest:

Designed and built WWVB time receiver interface and wrote simple time extraction program using 'lex' and 'yacc'
Created simple object code analysis tools to reverse engineer the 80186 code, and communication protocol for a scrolling LED sign
Engaged in family history genealogy research and wrote simple GEDCOM parsing code using 'awk', 'sed', 'tr', and 'sh'
Compiled Solaris 2.6 for PowerPC on Motorola Powerstack to evaluate portability of Solaris 2.6, Solaris 8, Solaris 10
Built a 20 processor Sun Microsystems Sparc Center SC2000E to evaluate SMP capabilities of various open source kernels

7/04 to 1/05 - Contract Software Engineer - ERICSSON IPI (through Aerotek), Rockville, MD

Keywords: Monta Vista Linux 3, Linux kernel 2.4.20, PPC, ARM, network device driver, PCI

Developed a series of 6 Linux device drivers for a custom IP communications blade. Implemented Monta Vista Linux Backplane Drivers for inter-processor communications across PCI.

wrote proof-of-concept device driver for pentium/x86
wrote proof-of-concept device driver for xscale/arm reference system
wrote interrupt-driven device driver for 8540/PPC
wrote DMA-driven device driver for 8540/PPC
wrote interrupt-driven device driver for Xscale/ARM
wrote DMA-driven device driver for Xscale/ARM
wrote and presented design documentation
wrote and executed test plan
wrote and published device driver user's manual pages

1/03 to 5/04 - student, JOHNS HOPKINS UNIVERSITY, Laurel, MD

Took graduate level classes in Computer Science, with an emphasis in Information Security.

Security and Privacy
Public Key Infrastructure
Cryptology
Information Assurance

3/01 to 12/02 - Senior Engineer II, ERICSSON IP INFRASTRUCTURE, Rockville, MD

Keywords: FreeBSD 3 kernel, network device driver, ethernet, gdb

Helped maintain FreeBSD kernel for a hardware based internet router. Focus included adding enhancements to improve the debugging capabilities of the system.

Instrumented ethernet driver and added PHY statistics to help debug an intermittent internal communication problem
Added hardware debug register support to kgdb to allow hardware breakpoint support
Maintained FreeBSD kernel through bug fixes

1/99 to 5/01 - Grader, JOHNS HOPKINS UNIVERSITY, Dorsey, MD

Keywords: Sun Sparc Solaris

Grader for 'Software Development in the UNIX Environment' for the Part-Time Engineering Graduate Program in Computer Science.

7/00 to 2/01 - Software Engineer, MEGISTO SYSTEMS, Germantown, MD

Keywords: requirements analysis high level design

Worked at a pre-IPO startup on a state-of-the-art internet edge router targeted at the wireless provider market. Focus included hardware/software interface design, device driver design, protocol internals, system architecture, software architecture, and requirements analysis. Worked on folding forwarding path into hardware for the BSD-based VxWorks protocol implementation.

Extracted Internet Router requirements from RFC-985, et al.
Analyzed various 2.5G and 3G encapsulation protocol specifications, including GRE and IP/IP
Designed the software interface to the ingress and egress hardware
Designed the network device driver for the BSD-based VxWorks TCP/IP stack

4/00 to 6/00 - Contract Software Engineer, BANCTEC, Silver Spring, MD

Keywords: HP-UX, FTP

6/99 to 3/00 - Contract Software Engineer, AERONAUTICAL RADIO (ARINC), Annapolis, MD

Keywords: C++, LAPB, GPIB, FLASH EEPROM, Sun, Sparc, Solaris, pSOS, CPCI, PowerPC G3, Motorola MPC750

3/99 to 5/99 - Contract Software Engineer, TIMEPLEX/SIMULATION LABS, Hyattstown, MD

Keywords: Sun, Sparc, SunOS, awk, sed, tr, sh

2/96 to 3/99 - Contract Software Engineer, AERONAUTICAL RADIO (ARINC), Annapolis, MD

Keywords: Sun, Sparc, Solaris, OSI, C++, VME, 68360, QUICC, 68040, pSOS, LAPB, HDLC, ICAO

10/94 to 2/96 - Senior Software Engineer, GRCI TELECOMMUNICATIONS DIVISION, Columbia, MD

Keywords: Sun, Sparc, SunOS, Sonet, OC-3, 68040, 68360, QUICC, pSOS

3/94 to 10/94 - Software Engineer, U.S. DESIGN, Columbia, MD
Keywords: DEC MicroVAX VMS, SCSI, i960

3/93 to 3/94 - Software Engineer, CRAY COMMUNICATIONS, Annapolis Junction, MD
Keywords: Sun, 3/80, SunOS, Green Hills, Oasys, 68000, T1

10/92 to 3/93 - Software Engineer, DOWTY COMMUNICATIONS, Cherry Hill, NJ
Keywords: 68000, 6502, LAPB, T1

5/86 to 10/92 - Staff Engineer, THE CATALYST CORPORATION, Newtown, PA
Keywords: National Semiconductor NS 32016, System V, Hitachi 64180, JMI Cexec, AT&T, 6836, 3B1, PC7300, Streams, Motorola MC68010, Unisys Convergent 80386, Sequent, BSD,

6/85 to 8/85 - Summer Intern, OBJECT RECOGNITION SYSTEMS, Princeton, NJ
Keywords: DEC VAX 11/750, BSD 4.2, Green Hills, Oasys, Motorola MC68000, JMI Cexec, RTC 146818

6/84 to 8/84 - Summer Intern, Center for Fluorescence Research in Biomedical Sciences, CARNEGIE-MELLON UNIVERSITY, Pittsburgh, PA
Keywords: DEC VAX 11/750, VMS, Fortran IV, Fortran 77, Knuth, Bivariate pseudo-random

EDUCATION

09/00 - InterOp mini-classes

Craig Partridge - Gigabit and Terabit Router Design
Radia Perlman - Bridge and Router Theory

05/00 - JOHNS HOPKINS UNIVERSITY, Baltimore, MD

Master of Science in Computer Science, Concentration in Systems and System Software

Keywords: Sun Sparc Solaris

05/86 - CARNEGIE-MELLON UNIVERSITY, Pittsburgh, PA

Bachelor of Science in Electrical Engineering, Concentration in Computer Engineering

Keywords: DEC PDP 20 TOPS, DEC VAX 11/780 BSD, Motorola MC68000, Green Hills, Oasys, MC6803, MC6801, MC6809E, Microware OS-9, Serial character device driver, Western Digital WD8250, MC6847, MC6845