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Altera_Forum
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20 years ago

Is custom intructions (CI) supported ? how ?

Good Morning everybody http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/biggrin.gif I tried working with custom instructions under the Nios IDE .. but how to use them under...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

Tarek,

I just added the bitswap custom instruction to a nios II system. Then I opened the IDE and compiled a hello_world program targeted to this system in order to generate the system.h file.

I copied the system.h file over to the linux environment where I do my uClinux software development, and wrote a little C program that uses the bitswap CI (just like the program in the CI user guide, but with additional printf statements to show the value before and after the bitswap). When I compiled I used the elf2flt flag, like hippo shows in his hello world document on the wiki, rebuilt the kernel and zImage, and it works perfectly.

-jason