Dec 2018 – Jul 2022 · 3 yrs 7 mos · Bengaluru Area, India

Apr 2016 – Nov 2018 · 2 yrs 7 mos · Bengaluru Area, India

Oct 2014 – Mar 2016 · 1 yr 5 mos · Hyderabad Area, India

• Design and development of -
• > GMAC and SPI flash linux drivers,
• > Multi-stage boot-loaders,
• > BSPs

May 2012 – Sep 2014 · 2 yrs 4 mos · Hyderabad Area, India

• [ Through Entropic's acquisition of Trident's Set-Top-Box BU ]
• Bringup of SDK on new STB chipsets
• > Working with hardware teams in debugging hw issues
• > Debugging BSP issues during bringup of System Usecases and Customer Demo's
• > Bringup of Bootloader and its low level device drivers such PLLs, Clock, DDR3, NAND, Serial NOR, I2C
• > Porting Linux Kernel 2.6.x and 3.x for new chipsets
• > Bringup of linux kernel device drivers such as NAND and Serial NOR flashes, USB, MMC, GMAC, Clock
• > Developing Lauterbach T32 scripts for flashing SW images and Debugging.

Feb 2010 – Apr 2012 · 2 yrs 2 mos · Hyderabad Area, India

• [ Through Trident's acquisition of NXP's Set-Top-Box BU ]
• Bringup of new STB chipsets and troubleshooting hardware issues.
• Validation of AHCI based linux SATA driver for features like ATAPI, NCQ, Power Management and throughput benchmarking.
• Development of Linux drivers for:
• > PCI host.
• > DMA based Hardware Acceleration for NOR flash,
• Enhancement and Debuging drivers for:
• > USB 1.1 and USB 2.0 host controller,
• > USB 2.0 device controller,
• > Serial NOR flash,
• > NAND flash,
• > NOR flash,
• > I2C
• Development of Linux driver for new implementation of NAND controller supporting ONFI 3.0, upto 32 bit ECC per 512 bytes block, DMA acceleration and upto 8K page size.

Aug 2008 – Jan 2010 · 1 yr 5 mos · Hyderabad Area, India

• [ Through NXP's acquisition of Conexant's Set-Top-Box BU ]
• Developed NAND driver for the upcoming Cortex A9 based STB chipsets of NXP Semiconductors. Verified NAND driver on System C based functional model of NAND controller in Virtual Prototyping Environment (VPE).
• Ported Windows based PCI device driver which was utilized for accessing MMIO andMemory and routing of interrupts to the host PC in a Mentor Graphics Emulation Platform for pre-silicon verification of the SoC. Supported and debugged BSP issues with SoC emulation platform.
• Developed algorithm for Dynamic Voltage Scaling (DVS) running on Cortex-M3 to control power consumption of the SoC in real time.
• Handled bringup of bootloader, drivers for NOR flash and dual SATA host controller of Apollo/Shiner STB SoC.

May 2007 – Aug 2008 · 1 yr 3 mos · Hyderabad Area, India

• Continued ownership of SATA drivers. Took SATA IP to the SATA Plugfest and Compliance Workshop, Apr 2008 in Portland, Oregon, USA.
• Supported customer in resolving SATA issues. Product was successfully deployed with PVR STB's in households of USA and Europe.
• Supported NAND (with HW ECC) and NOR flash drivers in uboot and linux kernel.
• Developed NAND Boot feature which allowed booting from NAND flash. Supported following boot options -
• Bootloader (NOR flash) + Kernel, Rootfs (NAND flash)
• Bootloader, Kernel and Rootfs (NAND)
• Developed Disk Boot features in uboot which allowed booting kernel and mounting rootfs from USB and SATA disks with bootloader running from NOR/NAND flash.

Jun 2005 – Apr 2007 · 1 yr 10 mos · Hyderabad Area, India

• Work with Serial ATA (SATA) specialist and software architect based at Conexant, San Diego, USA from May-July, 2006. Implemented ATA Tagged Command Queuing (TCQ) feature set.
• Gradually, I built considerable expertise in Serial ATA technology. I was then assigned global ownership of SATA for all Conexant chipsets.
• Supported end to end development of Serial ATA (SATA) host controller IP of Conexant used in PVR Set Top Box SoC's.
• I was involved in development of SATA IP right from the design phase, when I provided feedback and suggestions during the design of Native Command Queuing (NCQ) feature of SATA.
• Thereafter, I did pre-silicon verification of the SATA host controller on FPGA platform followed by validation on the ASIC platform.
• Worked at Conexant, San Diego/Newport Beach from Jan-Mar, 2007 to work closely with the hardware teams in debugging hardware issues on FPGA and ASIC platforms utilizing Lecroy Oscilloscopes, Agilent Logic Analyzer and Finisar SATA protocol analyzers.
• Developed libata based linux kernel driver for SATA host controller.
• Developed comprehensive SATA testharness suite for benchmarking of SATA throughput and features with different filesystems (xfs, ext3, ) and models of hard-drives.
• Utilized open source SCSI tools (sg_dd, etc), S.M.A.R.T tools and filesystem benchmarks for benchmarking libata SATA driver stack.
• Assisted integration of SATA driver with PVR subsystem.