Date: Wed, 14 Mar 2018 15:39:05 +0900 From: Michael Zhilin <mizhka@gmail.com> To: Vishal Gupta <vishalgupta7972@gmail.com> Cc: Warner Losh <imp@bsdimp.com>, "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>, "freebsd-embedded@freebsd.org" <freebsd-embedded@freebsd.org>, freebsd-mips@freebsd.org Subject: Re: GSOC 2018 ARM Cortex Processor Message-ID: <CAF19XBLCu9hC3_anw=WVOxN1KngeKXp%2B_wC914i9TrnAOyd=WA@mail.gmail.com> In-Reply-To: <CAKJMsQq4d-guaxr4-m6Md8OPQjSWJGBo6z2iPDiFu2ghmTZPgg@mail.gmail.com> References: <CAKJMsQruOFPFOEbxEJnWajrnBucT_WHGiT9wQAy4v19PMcVxWQ@mail.gmail.com> <CAF19XBJeioko7S9AEr5=L%2B83FEowhPQyPKANd2TMHJAqSK_W0Q@mail.gmail.com> <CANCZdfqUwoNO33PwftJJZ=f907jiCKDtY8Di7HFcD4Lqxi44_Q@mail.gmail.com> <CAKJMsQq4d-guaxr4-m6Md8OPQjSWJGBo6z2iPDiFu2ghmTZPgg@mail.gmail.com>
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Added freebsd-mips@ Regarding MIPS, I would like to see support for retail Realtek MIPS chips for instance (RTL8196, RTL8197). There are new brand router models: https://wikidevi.com/wiki/Tenda_AC6_V2 or https://wikidevi.com/wiki/Realtek#bgn_2 Thanks! On Tue, Mar 13, 2018 at 4:49 PM, Vishal Gupta <vishalgupta7972@gmail.com> wrote: > 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@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@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@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 >>> > _______________________________________________ >>> > freebsd-embedded@freebsd.org mailing list >>> > https://lists.freebsd.org/mailman/listinfo/freebsd-embedded >>> > To unsubscribe, send any mail to "freebsd-embedded-unsubscribe@ >>> freebsd.org >>> > " >>> > >>> _______________________________________________ >>> freebsd-embedded@freebsd.org mailing list >>> https://lists.freebsd.org/mailman/listinfo/freebsd-embedded >>> To unsubscribe, send any mail to "freebsd-embedded-unsubscribe@ >>> freebsd.org" >>> >> >> >
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