Release laysim-GR740 for Evaluation

laysim-GR740 Quad Core Processor Emulator

laysim-GR740 consists of three types of emulators: laysim-gr740, laysim-gr740-dbt and laysim-gr740-mdbt.

laysim-gr740 is a graphic user interface (GUI)-based and cycle-accurate emulator for the GR740 quad core processor based on interpretation method. It includes an embedded source-level debugger and supports MMU for Linux-SMP and XtratuM-SMP.

laysim-gr740-dbt is a GUI-based high-performance and cycle-approximate processor emulator with dynamic binary translation method.

laysim-gr740-mdbt is a new parallel GR740 processor emulator which adopts the multi-thread framework with DBT through 2 years development by KARI. It can satisfy the real-time performance of GR740 on a high-end PC such as Intel i9-11900K @5GHz.

All laysim-gr740, laysim-gr740-dbt and laysim-gr740-mdbt support Windows and Linux x64 platform including CentOS 7/8, Ubuntu 18.04 and Debian 10.3. Also two types of CLI (Command Line Interface) version, laysim-gr740-cli, laysim-gr740-dbt-cli and laysim-gr740-mdbt-cli, are provided especially for RTEMS5 testsuites. These versions have command line interfaces without a GUI, so the performance of CLI version shows higher than the GUI version of laysim.

laysim-GR740 Professional Version Only (Need separate license for full access)
  a) User loadable PCI and IO module are supported
  b) User loadable external SpW node, 1553B RT and CAN node simulation modules are supported
  c) Shared library is supported (save/restore are supported)


Features of laysim-GR740

1. Support Quad Core Emulation of GR740 (silicon revision 0 & 1)

laysim-GR740 can run RTEMS5 SMP applications.


laysim-GR740 can run Linux-SMP application. (laysim-gr740 only)


laysim-GR740 can run XtratuM-SMP application.



2. Support Device Models of GR740

laysim-GR740 supports various GRLIB's device models of GR740 including L2 cache, GR1553B, GRSpW Router and more.

1) laysim-GR740 with GR1553B


 2) laysim-GR740 with GRSpW Router



3. Embedded Source Level Debugger

laysim-GR740 includes the embedded source-level debugger, so it is possible to debug the GR740 SMP applications without GDB.



Limitation of laysim-GR740 Evaluation Version

The evaluation version of laysim-GR740 has NO execution limitation except acquiring 1 year free license as described in user's manual chapter 2.2


Download laysim-GR740 Evaluation Version

The evaluation version of laysim-GR740 and user's manual can be downloaded from Download article. (https://layright.blogspot.com/2020/02/download-laysim-leon3.html)

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laysim Processor Emulator for GR740, GR712RC, UT700 and more..

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I'm Jong-Wook Choi from KARI (Korea Aerospace Research Institute). I'm an on-board flight software engineer in KARI. I've developed the flight software for KOMPSAT-2/3/5/3A, CAS-500 and GEO-KOMPSAT-2A/2B. Currently I involve in developing of the flight software for KOMPSAT-6/7/7A, and KPLO (Korean Pathfinder Lunar Orbiter). For many years, flight software (FSW) has been developed and verified using the software test bed (STB) environment based on the real hardware in KARI. During the development of FSW on the STB, we have experienced lots of annoying problems such as delayed deliver of target hardware, limited concurrent access to the STB from software engineers, and the time and cost to create multiple STBs for different satellites. Thus, software-based satellite simulators have been developed from the beginning of a satellite project to avoid these issues. The software-based simulator enables the FSW to be developed concurrently with the satellite hardware from the in
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Download laysim-NOELV, laysim-GR740, laysim-GR712RC, and laysim-UT700

Currently the evaluation version of laysim-NOELV (RISC-V/RV64G, quad core),  laysim-GR740  (quad core),  laysim-GR712RC  (dual core), and  laysim-UT700  can be downloaded.  All  laysim  support Windows and Linux x64 platform including CentOS 7/8, Ubuntu 18.04/22.04, openSUSE 12/15 and Debian 10.3. Limitation of laysim The evaluation version of laysim  does not have any execution limitation except acquiring 1 year free license as described in user's manual Chapter 2.2. 
Read more