embOS for Cortex A8 was developed for and with CodeSourcery compiler and supports all memory models offered by these compilers. It comes with easy to use start projects for CodeSourcery  Codebench IDE. Initilization code for different Cortex A8 starter boards is included.

Resources and performance data

Memory usage
Kernel size (ROM)	approx. 1700 bytes
Kernel RAM usage	51 bytes
RAM usage per task control block	32 bytes
RAM usage per resource semaphore	8 bytes
RAM usage per counting semaphore	2 bytes
RAM usage per mailbox	20 bytes
RAM usage per software timer	20 bytes
RAM usage event	0 bytes
Min. stack-size per task (RAM)	72 bytes
Timing
Context switch time	TBD
Interrupt latency time	zero
Kernel CPU usage/TICK	less than .2% of total calculation time at 1000 Interrupts/second (1ms TICK)
Basic time unit (TICK)	typ. 1 ms, min. 20 µs (50 kHz interrupt frequency)
Features
Max. no. of tasks	Unlimited (by available RAM only)
Max. no. of mailboxes	unlimited (by available RAM only)
Max. no. of semaphores (resource/binary/counting)	unlimited (by available RAM only)
Max. no. of software timers	unlimited (by available RAM only)
Max. no. of priorities	64
Stack size idle task (RAM)	0(no memory needed)
Nested interrupts	permitted
Task switches from within ISR	possible

Absolute values given above were measured with embOS release build on an TI OMAP3503 CPU running at 600MHz.

embOSView offers system analysis during runtime

Additional information

CodeSourcery Web site for additional compiler info / support

Board support packages

embOS comes with lots of ready to go start projects and support packages for various Cortex A8 CPUs and starterboards.

CPU	Eval board
TI AM3517	LogicPD Zoom AM3517 EVM

 

---

 

Release notes embOS Cortex A8 for CodeSourcery

1. Tool chain used for build
2. New features
3. Improvements
4. Program corrections
5. Known problems/limitations
6. Release history
7. Miscellaneous

Tool chain used for build

The following tools have been used:

Compiler:  arm-none-eabi-gcc V4.3.2
Assembler: arm-none-eabi-as  V2.18.50
Librarian: arm-none-eabi-ld  V2.18.50
Workbench: Sourcery_CodeBench_IDE_2011.03-66

New features

Version 3.82t

1. Initial version for Cortex A8

Improvements

Version 3.82t

1. First version. None.

Program corrections

Version 3.82t

1. First version. None.

Known problems/limitations

Version 3.82t

1. First version. None.

Release history

Version	Release date	Short explanation
V3.82t	01. June 2011	Initial version for Cortex A8

Miscellaneous

This document was first released with version 3.82t of the software.
Software released earlier is documented internally. This information is available at request.