Date: Sun, 03 Dec 2017 16:23:26 -0800 From: Cy Schubert <Cy.Schubert@komquats.com> To: Bruce Evans <brde@optusnet.com.au> Cc: Warner Losh <imp@bsdimp.com>, Cy Schubert <Cy.Schubert@komquats.com>, Hans Petter Selasky <hps@selasky.org>, Eitan Adler <lists@eitanadler.com>, "Rodney W. Grimes" <freebsd-rwg@pdx.rh.cn85.dnsmgr.net>, "freebsd-arch@freebsd.org" <arch@freebsd.org> Subject: Re: Deprecating / Removing floppy drive support Message-ID: <201712040023.vB40NQkJ037536@slippy.cwsent.com> In-Reply-To: Message from Bruce Evans <brde@optusnet.com.au> of "Mon, 04 Dec 2017 10:40:54 %2B1100." <20171204092457.I961@besplex.bde.org>
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In message <20171204092457.I961@besplex.bde.org>, Bruce Evans writes: > On Sun, 3 Dec 2017, Warner Losh wrote: > > > On Sun, Dec 3, 2017 at 1:05 PM, Cy Schubert <Cy.Schubert@komquats.com> > > wrote: > > > >> In message <201712031655.vB3GtIME041023@pdx.rh.CN85.dnsmgr.net>, "Rodney > >> W. > >> Gri > >> mes" writes: > > The inner quoting is more broken than usual (split in the middle of > rgrimes' name). > > >>> **RANT ON** > >>> > >>> Data point: OpenBSD still supports install from floppies.. so > >>> my guess is that OpenBSD has been able to keep this code running, > >>> it is a "Sad State of Affairs" that FreeBSD with 300+ developers > >>> can not manage the same. As Eitan pointed out, its only a 1000 > >>> lines so of code. Really now, we can manage to keep the mass > >>> of clang and zfs running, but we can not keep a 1000 line fdc.c > >>> running? > > Actually 5000+ lines of code: at least: > - 2835 lines in dev/fdc > - 195 lines in sys/fdcio.h > - 335 lines in man4/fdc.4 > - 2578 lines in fdcontrol, fdformat, fdread and fdwrite > > > The floppy driver itself is fine. It relies, however, on ISADMA working. It > > got broken and nobody noticed. Also, FreeBSD has SMP while OpenBSD does > > not, so that's been a much larger code velocity over all. > > > > Reading works OK. It's writing that fails. So this datapoint is consistent > > with my experience. There's other issues that need to be fixed apart from > > ISADMA, but those are minor in comparison. > > ISADMA worked for writing by fdformat and cp of 1 floppy under -current here. > I used a UP i386 system with 1GB. If the bug only affects SMP, and64 or > large memory, then it is easy to work around by not using these. Memory > above 4GB is especially easy to avoid using a boot option. The following on a my amd64 testbed while writing. bob# dmesg g_vfs_done():fd0[READ(offset=184320, length=512)]error = 5 bob# uname -a FreeBSD bob 12.0-CURRENT FreeBSD 12.0-CURRENT #10 r326456M: Sat Dec 2 00:54:10 PST 2017 root@bob:/export/obj/opt/src/svn-current/amd64.amd64/s ys/BREAK amd64 bob# sysctl hw.realmem hw.realmem: 5368709120 bob# You are right Bruce. Using the same machine but with FreeBSD-12 i386 it works perfectly. bob# uname -a FreeBSD bob 12.0-CURRENT FreeBSD 12.0-CURRENT #8 r326456M: Sat Dec 2 07:42:12 PST 2017 root@bob:/export/obj/opt/src/svn-current/i386.i386/sys /BREAK i386 bob# I think the todo here is either a) fix fdc(4) to work on amd64 or b) remove fdc(4) from GENERIC on amd64. > > >> I've spent some time thinking about this while cleaning up the yard of old > >> leaves today. All three of my machines downstairs still have fdc(4) > >> controllers and take a poke at it. > >> > >> USB floppy does also work. The ufdformat USB floppy format (not yet > >> committed, thank you bms@) also works in 12 (it didn't in 7 due to borked > >> USB in 7). I've yet to decide whether to commit it as is or merge it into > >> the existing fdformat. > > > > I'd commit it as is (ufdformat). It's functionality is quite a bit > > different because the CDBs are much less expressive than the full NEC 765 > > chip supports (which is itself a subset of what you can do on a floppy, but > > I digress). > > So usb floppy drives can't even duplicate fdformat's functionality? > There is also hard to replace functionality in other utilites. Not at the moment but I plan on committing a USB version of fdformat when it passes review. It works perfectly using a TEAC FD-05PUW 3000. -- Cheers, Cy Schubert <Cy.Schubert@cschubert.com> FreeBSD UNIX: <cy@FreeBSD.org> Web: http://www.FreeBSD.org The need of the many outweighs the greed of the few.
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