Implementation of -fPIC (large mode) for Nios 'toolchain-mmu'

Hi Kazu,

It would be awesome if you could post your patches to the Nios II Linux development mailing list where the developers could review them and maybe commit them.

Nios2-dev mailing list

Nios2-dev@sopc.et.ntust.edu.tw

http://sopc.et.ntust.edu.tw/cgi-bin/mailman/listinfo/nios2-dev

Hi,

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It would be awesome if you could post your patches to the Nios II Linux development mailing list where the developers could review them and maybe commit them.

Nios2-dev mailing list

Nios2-dev@sopc.et.ntust.edu.tw

http://sopc.et.ntust.edu.tw/cgi-bin/mailman/listinfo/nios2-dev

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Thank you for your suggestion. But I'm hesitating to join there, because the discussions are dull a little bit and I can't understand the intention and direction of maintainers. Of course, also I can't understand why Altera throws these thing all to volunteers and does nothing. Now it seems that they are planning to put ARM and MIPS CPU into their FPGA, but I can't believe their business goes well.

Kazu

Hi Kazu,

What toolchain source were you using to work on these patches? Is it the one listed here http://alterawiki.com/wiki/build_the_gcc4_toolchain ? Have you looked into updating the toolchain at all?

Hi,

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What toolchain source were you using to work on these patches? Is it the one listed here http://alterawiki.com/wiki/build_the_gcc4_toolchain ? Have you looked into updating the toolchain at all?

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I'm using the source of version 4.1-176. And of course, I did not up-load these patches anywhere except this forum.

Kazu

Hi Kazu,

Do you have a patch for elf/nios2.h's RELOC_NUMBER declarations (and possibly other things)? Trying to build binutils, I get errors like:

/opt/nios2gcc4/obj/binutils-src-4.1-176-nios2-linux-gnu-i686-pc-linux-gnu/bfd/elf32-nios2.c:778: error: `R_NIOS2_CALL_LO' undeclared here (not in a function)

Hi,

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Do you have a patch for elf/nios2.h's RELOC_NUMBER declarations (and possibly other things)? Trying to build binutils, I get errors like:

/opt/nios2gcc4/obj/binutils-src-4.1-176-nios2-linux-gnu-i686-pc-linux-gnu/bfd/elf32-nios2.c:778: error: `R_NIOS2_CALL_LO' undeclared here (not in a function)

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Sorry! Try this.

Kazu

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Hi,

I can't understand why Altera throws these thing all to volunteers and does nothing. Now it seems that they are planning to put ARM and MIPS CPU into their FPGA, but I can't believe their business goes well.

Kazu

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Altera looks bigger from the outside than from inside. :-) From the outside Altera looks like this Big Company that should be able to do just everything. From the inside it looks like everyone is running as fast as they can just to stay in place, like the Red Queen.

Getting ARM-based FPGAs out the door did unfortunately divert effort from Nios2 support. That's life in a world of limited resources.

We're trying to make up for that now. (I was hired a year ago to help jump the Nios2 toolchain from 4.1.2 -> 4.7.3.) Going forward, we (and I!) intend and expect to do a much better job of keeping the Nios2 toolchain current. We really appreciate your patience, support, enthusiasm and contributions.

(We've also got some nice updates to Nios2 itself in the tubes, but I don't think I'm allowed to talk about those yet.)

-Jeff

Hi,

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(We've also got some nice updates to Nios2 itself in the tubes, but I don't think I'm allowed to talk about those yet.)

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Personally, I will appreciate if Altera discloses the secret around Nios2's data cache.:)

http://www.alterawiki.com/wiki/nios2_smp_system

Kazu

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Hi,

Personally, I will appreciate if Altera discloses the secret around Nios2's data cache.:)

http://www.alterawiki.com/wiki/nios2_smp_system

Kazu

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I apologize if I'm being dense (I'm not a Hardware Guy), but I skimmed that page without figuring out what it is that you'd like to know. Can you be clearer?

-Jeff

Hi,

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I apologize if I'm being dense (I'm not a Hardware Guy), but I skimmed that page without figuring out what it is that you'd like to know. Can you be clearer?

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Altera's original data cache lacks several features to make a SMP system, so I made my new one and attached it to Nios CPU from the outside. However, it's not an efficient cache because I can't use some Nios CPU's internal signals, e.g. the linear address signal, cache-uncache signal and cache hit signal, etc. If I could use those signals, I could run the SMP system faster. But this means that Altera is requested to disclose their source code.:)

I think that maybe the 'multi-core Nios2 SMP + linux + shielded CPU technique' system is a good solution for real-time systems from the viewpoint of its flexibility.

Kazu