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1.14.4. Kernel Scaling #
NAME
Nanokernel Scaling
Using conditional compilation, the Unison Nanokernel can have features added and removed, changing its size and capabilities.
SYNOPSIS
Description
The Unison Nanokernel can be scaled to reduce its’ memory footprint and can be tailored to meet specific requirements. The means to do this tailoring is entirely by using conditional compilation and rebuilding the library that comes with your release. The various options are discussed below.
Compile Time Options
Pool Options
- HEAP_BOUNDS
- Add heap bounds checking for first fit memory pool.
- DEBUGON
- Turn on basic error message reporting using xprintf for the first fit memory pool.
- VERBOSE
- Turn on verbose error message reporting using xprintf for the first fit memory pool.
POSIX Features
- _POSIX_MESSAGE_PASSING
- Include POSIX message passing features
- _POSIX_THREAD_PRIORITY_SCHEDULING
- Support priority thread scheduling.
- _POSIX_TIMERS
- Include POSIX timers in the system.
- _POSIX_TIMEOUTS
- Include POSIX timeouts in the system.
- _POSIX_THREAD_PRIO_INHERIT
- Inherit the parent’s thread priority.
- _POSIX_THREAD_ATTR_STACKADDR
- Include the stackaddr attribute as an option.
- _POSIX_THREAD_ATTR_STACKSIZE
- Include the stacksize attribute as an option.
Advanced Options
- MULTIPROC
- Select multicore operation, use only with factory collaboration.
- DLOG_SUPPORT
- Include datalogging support.
- PACK
- Used for Word oriented machines to pack characters in a word.
- _TARTAN
- Used for Word oriented machines to adapt for the compiler.
MCU, MPU, and Softcore Options
- M16C
- Renesas M16C and R8C support.
- _RX
- Renesas RX support.
- NC100
- Renesas RXNC100 support
- _SH2A
- Renesas SH2A support.
- _SH2AFPU
- Renesas SH2A with FPU support.
- _R32C100
- Renesas R32C100 support.
- _MICROBLAZE
- Xilinx Microblaze softcore support.
- _ARMCORTEXM0_
- Reserved.
- _ARMCORTEXM1_
- Reserved.
- _ARMCORTEXM3_
- ARM Cortex M3 support.
- _ARMCORTEXM4_
- ARM Cortex M4 support.
- _ARMCORTEXA5_
- Reserved.
- _ARMCORTEXA8_
- ARM Cortex A8 support.
- _ARMCORTEXA9_
- Reserved.
- _ARMCORTEXR4_
- Reserved.
- _PIC24_
- Microchip PIC24 support.
- _dsPIC30_
- Microchip dsPIC30/33 support.
- _PIC32MX
- Microchip PIC32 support.