Release laysim-GR740 v3.0

I am pleased to announce the release of laysim-GR740 v3.0, which has been developed through significant effort. The new version introduces the following changes and updates:


1. The previously separated versions (GUI, CLI, MMU, PERF) have been consolidated into a unified GUI/CLI version for improved usability.

2. Support has been added for the GUI-based laysim-gr740-mdbt.

3. The Linux guest environment is once again supported in the DBT/MDBT versions. (In this case, Linux employs an MMU with multiple page tables, and the simulator has been updated to support code cache retranslation on a page basis in response to self-modifying code.)

4. Users can now modify the RAM and ROM sizes, as well as configure the CPU operating frequency.

5. Support for GR740 silicon revision 0 has been discontinued; only revision 1 is now supported.

6. All internal simulation modules for 1553B, GRCAN, CAN, and SpaceWire have been removed. External interface simulation is now available exclusively through loadable modules.




The evaluation version of laysim-GR740 and documents are available for download via Google Drive, and the release of laysim-GR712RC/UT700 v3.0 are planned in the near future.

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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.  Simple Comparison Chart for laysim-GR740/GR712RC/UT700   laysim-GR740 laysim-GR712RC laysim-UT700 (Evaluation Version) laysim-GR740 laysim-GR712RC laysim-UT700 (Professional Version)  Execution Time Limitation   No  No  Need 1 year free license Yes  Permanent License   Support Loadable Modules Yes only for Pre-built Models  Yes   Provide all source codes of   loadable modules     No...
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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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