What are the typical RAM requirements for MicroC/OS II on Nios II?

Question

I've allocated 65536 bytes of RAM (which is nearly all that is available on chip) but as I compile the Hello MicroC/OS II example project in Eclipse, I get the following errors:

/opt/intelFPGA_lite/nios2eds/bin/gnu/H-x86_64-pc-linux-gnu/bin/../lib/gcc/nios2-elf/5.3.0/../../../../../H-x86_64-pc-linux-gnu/nios2-elf/bin/ld: address 0x21c08 of ucos.elf section `.rwdata' is not within region `ram'

/opt/intelFPGA_lite/nios2eds/bin/gnu/H-x86_64-pc-linux-gnu/bin/../lib/gcc/nios2-elf/5.3.0/../../../../../H-x86_64-pc-linux-gnu/nios2-elf/bin/ld: address 0x2acd4 of ucos.elf section `.bss' is not within region `ram'

/opt/intelFPGA_lite/nios2eds/bin/gnu/H-x86_64-pc-linux-gnu/bin/../lib/gcc/nios2-elf/5.3.0/../../../../../H-x86_64-pc-linux-gnu/nios2-elf/bin/ld: address 0x21c08 of ucos.elf section `.rwdata' is not within region `ram'

/opt/intelFPGA_lite/nios2eds/bin/gnu/H-x86_64-pc-linux-gnu/bin/../lib/gcc/nios2-elf/5.3.0/../../../../../H-x86_64-pc-linux-gnu/nios2-elf/bin/ld: address 0x2acd4 of ucos.elf section `.bss' is not within region `ram'

I understand that this may mean that there is not enough RAM, but I'm surprised that MicroC/OS II requires so much. Am I missing something?

abe · Answer

Have a look at the following documentation for MicroC/OS II on NIOS-II. This should get you started with the MicroC/OS II and NIOS designs

https://www.intel.com/content/dam/altera-www/global/en_US/pdfs/literature/tt/tt_nios2_microc_osii_tutorial.pdf

https://www.intel.com/content/www/us/en/programmable/support/support-resources/design-examples/intellectual-property/embedded/nios-ii/exm-microc-osii-tutorial.html

https://www.intel.com/content/www/us/en/programmable/support/support-resources/design-examples/intellectual-property/embedded/nios-ii/exm-hello_micro.html

kdavi3 · Answer

Thanks. That documentation doesn't directly answer the question, but I followed your suggestion to look further at the Using MicroC/OS-II RTOS with the Nios II Processor Tutorial. It uses the hardware from the Nios II Ethernet Standard Design Example, which appears to use an external 32 MB SDRAM chip. I certainly don't have nearly that much RAM. The Nios II Ethernet Standard Design Example is available for various development boards, and I think they all have external SDRAM, which leaves me to question if  MicroC/OS-II RTOS can even run at all with only on-chip memory.

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What are the typical RAM requirements for MicroC/OS II on Nios II?

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