Date: Sat, 24 Jan 2004 18:33:46 -0500 From: John Baldwin <jhb@FreeBSD.org> To: Peter Jeremy <PeterJeremy@optushome.com.au>, freebsd-current@freebsd.org Subject: Re: 80386 support in -current Message-ID: <200401241833.46964.jhb@FreeBSD.org> In-Reply-To: <20040124210945.GJ908@cirb503493.alcatel.com.au> References: <20040124074052.GA12597@cirb503493.alcatel.com.au> <20040124210945.GJ908@cirb503493.alcatel.com.au>
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On Saturday 24 January 2004 04:09 pm, Peter Jeremy wrote: > On Sat, Jan 24, 2004 at 06:40:52PM +1100, I wrote: > >Does anyone know why FreeBSD 5.x would not run on a 386SX/387SX > >combination? I realise the performance would be very poor but I > >don't see any reason why it wouldn't work at all. > > Based on the responses, I should have included more details. In my > defense, I was being dragged out of the house at the time. This is a > theoretical question rather than a problem with an actual system. I > am aware that the FPU is mandatory (hence the 386/387 combination) and > I'm aware that I need to build a kernel with "CPU_I386" which then > can't run on anything else (I meant to state this). > > My question was triggered by reading the 5.2-RELEASE i386 Hardware > Notes which state that the 80386 is supported but the 80386SX isn't. > I believe this is a documentation bug - especially since the "80386SX > isn't supported" was committed about a week after the FPU emulation > code was axed, though there's no mention of FPU requirements in the > hardware notes. I've written a PR (www/61824) but thought I'd double > check my facts. This is a docco bug. Neither 80386[DS]X include a FPU, so a 387 would be required in both cases. However, for 80846's, a 486SX does not include an FPU and would require a 487. The 486 DX does include an FPU and will work fine. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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