Samsung NX300: Dissecting a Hacked Firmware
I mentioned in an earlier blog post, that I'm working on the Samsung NX300(m) mirrorless cameras and trying to get some features to work. I outlined in that post a way to get unlimited movie record length. While this method seems to screw up the time remaining, recording always stops just...
MMU on Raspberry Pi (ARMv6 Address Translation)
Preface This example demonstrates ARM MMU basics. You will need the ARM ARM (ARM Architectural Reference Manual) for ARMv5. This code so far does not work on the Raspberry pi 2 yet, will get...
Porting Micropython to bare-metal Raspberry Pi
In the last months I ported Micropython to the Raspberry Pi. Micropython is an embedded Python interpreter, which already runs on ARM Cortex-M processors. I had to understand the build process, alter it as to target the Raspberry Pi processor and fix some annoying bugs and glitches. The...
Controlling features of the ARM1176jzf-s (Raspberry Pi)
This article is about the Raspberry Pis Processor, the ARM1176jzf-s. It is a 32 Bit ARM-processor, with ARMv6-architecture. It has a VFPv2 Floating Point Unit, can run Java Bytecode natively (Jazelle), can run Thumb(1) code, can use both little and big endian-data, has an MMU and many things...
PiOS: ARM Timer and Interrupts
For quite some time I've been working on a prototypic operating system, PiOS (previously PilotOS) [1]. I've been writing articles earlier about processes [2][3] and I want to discuss the current state here. Additional to a rewrite of most of the code, so removing the assembler-code and...
PiOS: ARM Timer und Interrupts
Seit einiger Zeit arbeite ich an einem prototypischem Betriebssystem, PiOS ("früher" PilotOS) [1]. Ich habe früher schon einige Artikel über Prozesse [2][3] geschrieben und will nun hier den aktuellen Stand diskutieren. Neben einem Rewrite des Codes, also entfernen quasi aller...
