Maquefel's Stash

Don’t fear the bricking (unbricking Unmatched via JTAG)

Tue, 11 Jan 2022 07:41:50 +0000

First published at: https://forums.sifive.com/t/dont-fear-the-bricking-unbricking-unmatched-via-jtag/5449

Despite, as i think, this is quite obvious, some people miss the point.

So let me show you how to unbrick the HiFive Unmatched board, that’s usefull in case of:

installing BSP without the need of preparing the SD card in advance (you still have to insert it through)
unbricking the board in case of deleting U-Boot
testing U-Boot + OpenSBI on fly hijacking the load addresses

The scheme works independently of selected MSEL value.

Using gpio-generic and irq_chip_generic subsystems for gpio driver

Sat, 10 Sep 2016 12:31:52 +0000

Intoduction

This article is a logical continuation of the previous one and it is recommended to stady after reading the previous material. The current note is necessary for understanding the subsequent material, a further understanding gpio subsystem as a whole and helps with the development of own gpio drivers. The provisions of this article have not only apply to our virtual driver gpio, but also to any mmio gpio driver in general. It will focus on “optimizing” referred to in the preceding article.

QEMU ivshmem Introducing interrupt capable virtual gpio concept

Thu, 14 Jul 2016 12:21:27 +0000

Introduction

It’s hard to underestimate the role of GPIO’s, especially in ARM embedded systems. Apart of being a very popular material for starters, GPIO’s provide a way for controlling the many peripheral devices, act as source of valuable interrupts, or even can be the only way to communicate the world for a SOC.

Curriculum vitae

Fri, 10 Jun 2016 12:07:33 +0000

Moscow	Nikita O. Shubin	maquefel@gmail.com
Employment history
Software Engineer, Senior	Topcon Positioning Systems	December 2016
Embedded Software
Software Engineer, Senior	Kemek Engineering	May 2012 - December 2016
Moved core company product from QNX 6.3.2 to modern Linux system rewriting many parts to conform modern standards Implemented centralized configuration API with rich network interfaces supporting many programming languages Developed rich TCD procedure and software for automatic deployment and testing using new approach based on KVM
Head of Soil Mechanics Dep.	MOSTDORGEOTREST	January 2009 - May 2012
Developed and implemented processing and accounting system for soil characteristics experiments with automatic reports and cost calculation Studied and implemented fundamentally new methods of investigation of the properties of soils
Software Engineer	Kemek Engineering	October 2007 - May 2012

PHP Programmer	Freelance

Education
MGUPI (combined with Moscow Technological Institute in 2014)	Engineer-Mathematician Applied Mathematics	Fall 2005 - Summer 2010
Technical Experience
Soil lab automatization software (full cycle, including invoice). C++, Qt, Postgresql, Microsoft Excel Algorithms and software for automatic processing of experiments by triaxial compression. Calculation of Poisson's ratio, volumetric modules and linear deformation. С, Qt visualization. Full device development cycle, including wiring diagrams, software, procedures, and technical control of the production cycle. ADC, C, C++, Embedded Arm Linux.
Additional Experience and Awards
Nokia Certified Qt Developer Nokia Certified Qt Specialist: Core C++ for Qt Developers
Languages and Technologies
С; С++; Bash; Qt 4.8 (Rusty); PHP (Rusty); SQL (Rusty); GNU/Linux, Linux kernel Autotools and cross compiling sage Large experience with embedded development