Hi,

In general the "upgrade to a real 040" advice is the best.

For those of you who can't then (for 1.5.2) at least you can
find the necessary steps at:

http://homepage.iprolink.ch/~bioneel/beo/NetBSD.html.

The above gives instructions to build a software fp
emulator into libc.  

Once you build a software fp emulator into libc then
any program built with -msoft-float and then linked
against this libc seems to be 100% solid.

I'll do 1.6 soon, but, Integral launches tomorrow 
(http://www.esa.int/integrallaunch) and I'll be real real
busy for a few months after.

cheers

bruce

gabriel rosenkoetter <gr@eclipsed.net> wrote:
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> On Sun, Oct 13, 2002 at 01:50:37PM +0200, Magnus Henoch wrote:
> > Is it so, that all LC040 processors need workarounds, but those
> > prior to revision 2E71M won't work anyway?
> 
> That is correct. (I'm unconvinced on the "2E71M masked processors
> can work" part, but I'm not as familiar with this as others.)
> 
> > Or do only the earlier revisions need workarounds?
> 
> The earlier revisions will never work (that is, even SoftwareFPU
> under Mac OS doesn't get you a working FPU; the registers of the
> chip itself operates in a way that hamstrings any attempt to emulate
> floating point math). The later revisions *might* work, but don't
> at present with NetBSD/mac68k unless something's changed drastically
> and I didn't notice.
> 
> > What is the current status of these fixes?
> 
> Non-existant, to my knowledge.
> 
> > On my chip I read "XC68LC040RC25B", "02E23G" and "QEZH9428B".
> 
> I believe that means your mask is 2E23G, so in theory software FPE
> could work for you.
> 
> Note that software FPE is *painfully* slow. You don't want to be
> using it if you can at all avoid it.
> 
> > Would I be better off trying to find something else?
> 
> You'd be best off removing the LC040 and replacing it with a real
> 040. Provided your processor is socketed (I don't recall whether or
> not that's the case in the 475, but popping open the case will
> answer that question for you) or soldered. In the latter case,
> you'll have a hard time replacing the processor. Based on another
> post, though, it sounds like you're okay.
> 
> A (used) 040 should run you $20 or less these days from any of a
> variety of online, Mac hardware merchants. Don't get suckered and
> pay way too much to Sun Remarketing for it, do a Google search for
> "mac hardware" or something similar instead. It may not be a part
> that's listed on a sales web site, but call and find out if
> merchant's have (or could get) one.
> 
> When I replaced the chip in my Performa 636 five, maybe six years
> ago, I got the 040 from a nice man in Texas named Bucky. But that's
> all I remember, and the sales information is several states away.
> 
> Good luck...
> 
> --=20
> gabriel rosenkoetter
> gr@eclipsed.net
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