GSOC 2018 ARM Cortex Processor

[Vishal Gupta]

Thank you for the reply.
Which new processor would you suggest between PowerPC, ARM, and MIPS which
i can port during the summer period and will also be useful for the
community.

Vishal Gupta

On Tue, Mar 13, 2018 at 11:52 AM, Warner Losh <imp at bsdimp.com> wrote:

> There's not currently any other FreeBSD port that works on a system
> without a MMU. The buffer cache assumes that we can fault in pages as
> needed based on virtual address access. The TEXT sharing between programs
> assumes we can map the same page into multiple processes. The shared
> libraries we have assume something similar, and in some cases copy on write
> on top of that (though that's no different from a HW perspective than these
> first few cases).
>
> So, if you're willing to live without these features, or find some other
> way to accomplish the same sorts of things, a cortex M/R port would be
> tricky. Also, FreeBSD's kernel size may present some obstacles. We're
> optimized for a rich memory environment, so we trade extra copies of code
> to speed up execution of code, which matches the x86 market, as well as the
> high-end of embedded quite well.
>
> If you are looking for a BSD to port to these processors, you might
> consider looking at what www.retrobsd.org has done with their 2.11BSD
> port to the MIPS processor in the PIC32 core with the MIPS M4K
> architecture. It runs in as little as 128k of RAM, while FreeBSD these days
> needs at least 128MB of RAM without careful tuning...
>
> Warner
>
> On Tue, Mar 13, 2018 at 12:07 AM, Michael Zhilin <mizhka at gmail.com> wrote:
>
>> Hi,
>>
>> Disclaimer: I'm neither ARM expect nor GSoC person.
>>
>> I may be wrong, but FreeBSD (or Linux, doesn't matter) requires MMU which
>> is my tossing in Cortex M/R family of ARM processors. So it's technically
>> difficult/impossible to port it on non-MMU processor.
>>
>> Added freebsd-arm@ for wide audience.
>>
>> Thank you!
>>
>>
>>
>> On Tue, Mar 13, 2018 at 1:12 PM, Vishal Gupta <vishalgupta7972 at gmail.com>
>> wrote:
>>
>> > Hi,
>> > I am interested in working on the project to port FreeBSD to ARM Cortex
>> M
>> > or R series microprocessor. Some queries related to the project are :-
>> > 1) What are the expected deliverable for the project.
>> > 2) Where to put my draft proposal for review so that it can be improved.
>> >
>> > An early reply is awaited.
>> >
>> > Thanks and regards,
>> > Vishal Gupta
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>
>