Date: Sun, 19 Oct 2014 21:31:15 -0400 From: Alexander Kabaev <kabaev@gmail.com> To: Juli Mallett <jmallett@freebsd.org> Cc: Ben Morrow <ben@morrow.me.uk>, "freebsd-mips@FreeBSD.org" <freebsd-mips@freebsd.org> Subject: Re: Trying to get MALTA64 running under qemu Message-ID: <20141019213115.336c997f@kan> In-Reply-To: <CACVs6=9Q8r=GNQ7hWOovQXZ97NXnC6=Jr5UTiBdirid31AwvrQ@mail.gmail.com> References: <20141018225950.GA12023@anubis.morrow.me.uk> <CAJ-Vmon5yFb7z5gDAZ4StAOY%2B05dBjd8w9u1PWZHR_ihynk9Ow@mail.gmail.com> <20141019223447.GB12023@anubis.morrow.me.uk> <CACVs6=9Q8r=GNQ7hWOovQXZ97NXnC6=Jr5UTiBdirid31AwvrQ@mail.gmail.com>
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--Sig_/9LdL6l8iLSBHKJbl6ezXTP0 Content-Type: text/plain; charset=KOI8-R Content-Transfer-Encoding: quoted-printable On Sun, 19 Oct 2014 15:49:56 -0700 Juli Mallett <jmallett@freebsd.org> wrote: > On Sun, Oct 19, 2014 at 3:34 PM, Ben Morrow <ben@morrow.me.uk> wrote: >=20 > > Adrian Chadd <adrian@freebsd.org> wrote: > > > On 18 October 2014 15:59, Ben Morrow <ben@morrow.me.uk> wrote: > > > > I'm considering buying an ERL to use as a local router, but > > > > before I > > did > > > > I thought I'd make sure the ports I want to run work properly > > > > with > > MIPS, > > > > so I'm trying to bring up a qemu-system-mips64 instance. I've > > > > built world and kernel (using MALTA64) for mips.mips64, and > > > > built a disk > > image > > > > following the instructions on the MipsEmulation page on the > > > > wiki. The source I am using is a slightly patched 10-STABLE > > > > from 2014-09-09; the patches have nothing to do with MIPS. > > > > > > > > However, when I try to bring qemu up, the system appears to > > > > hang after probing the ata devices. Over the course of about 30 > > > > seconds the qemu process goes up to 100% of one CPU, and no > > > > more output appears on the console. This appears to happen > > > > regardless of the disk images I pass to qemu; I've tried > > > > passing a UFS image, a file full of zeros, no disks at all, and > > > > (just in case) both -hda and -hdc. I've included the boot log > > > > below; I'd appreciate any advice. > > > > > > can you try qemu-devel? > > > > Thank you, that works. (Good God, it's slow... I wonder how hard it > > would be to replace cc with something that runs a cross-compiler on > > the host? Maybe I can do something with distcc...) > > >=20 > The optimal thing here is to use a user-mode emulator, whereby you can > effectively run a MIPS userland through qemu on a FreeBSD host, so > all of the kernel stuff is being done natively - which is a lot for > things like package building; others have done this for ARM, and I > believe that one of the groups using FreeBSD/MIPS was looking at > doing so for MIPS as well for the sake of package builds, etc. You > might create a new thread for user-mode MIPS emulation to see if any > of the right people notice and respond, or perhaps dig into what the > ARM folks have done. >=20 > Thanks, > Juli. There is not much to it, usermode emulation for mips64 just works for the purpose of the package building, that is how I have been doing it for a while now. I did not get the cross-toolchain going on, but even just running package builds under qemu-bsd-user on my amd64 machine lets me take advantage of multiple CPUs and much less restrictive amounts of memory and is a big win. Five lines recipe: 1. build and install emulators/qemu-user-static port or use package 2. build and install mips64 world info some location, say, make it /scratch/mips for the purpose of this recipe. 3. mount devfs info that image: sudo mount -t devfs devfs /scratch/mips/dev 4. copy /usr/local/bin/qemu-mips64-static info some place within the mips64 tree you have created above. /scratch/mips/usr/local/bin/qemu-mips64-static will do nicely. 5. start the mips64 shell:=20 sudo chroot /scratch/mips /usr/local/bin/qemu-mips64-static /bin/sh Voila, you are running in environment that is good enough to build many of the ports. Now, you can start playing with installing cross-tools into that image so that compilers/linkers are native and you do not pay the price of emulation to run them and start writing five line recipes for others :) --=20 Alexander Kabaev --Sig_/9LdL6l8iLSBHKJbl6ezXTP0 Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iD8DBQFURGXpQ6z1jMm+XZYRAlH0AJ91s1Z8x+5nI8QZuFU2JLUrvaLAAQCdFk4Q yYNLQws1mv5hmqYo99m6X/k= =BTex -----END PGP SIGNATURE----- --Sig_/9LdL6l8iLSBHKJbl6ezXTP0--
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