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5. Multiprocessor
For OSes that clearly include the notion of task, i.e. the two "multitasking" cases we have just presented, we can add a multiprocessor dimension. Indeed, a survey [4] carried out in 2006 showed that 80% of embedded systems included at least two processors, and ITRS [5] predicts an explosion in the number of processors. This is a new situation that operating systems for embedded systems must take into account.
The strategy for managing the different processors varies according to the hardware architecture in question.
For homogeneous architectures, i.e. with a single type of processor and a regular memory architecture, we generally opt for a "symmetric" operating system (SMP or Symmetric Multiprocessing). In this situation, a single OS is used by all processors. At boot time, all processors load their instructions from the same address,...
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Multiprocessor
Embedded OS architectures
Bibliography
Software tools
Google. Android http://developer.android.com/index.html
DSpace, Inc. dSpace. http://www.dspaceinc.com.
The Mathworks. Real-Time Workshop. http://www.mathworks.com/products/rtw/
...Websites
REEVES Glenn, "What really happened on Mars?", http://research.microsoft.com/en-us/um/people/mbj/Mars_Pathfinder/Authoritative_Account.html
...Events
Symposium on Operating Systems Design and Implementation, biannual (even-numbered years) leading symposium on operating systems, including OS for embedded systems, sponsored by USENIX and ACM.
International Conference on Architectural Support for Programming Languages and Operating Systems, a leading OS conference sponsored by the ACM.
Embedded Linux Conference, annual conference...
Standards and norms
- Standard Test Access Port and Boundary-Scan Architecture, IEEE Std. 1149.1-1990. - IEEE -
- Functional Safety of Electrical / Electronic / Programmable Electronic Safety-related Systems, IEC 61508-1998, International Electrotechnical Commission. - IEC -
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