Re: [hatari-devel] FPU detection update

[Bob Carpenter <hatari@xxxxxxxxxx>]

When I saw the Mega STE specification sheet where it mentioned an optional 68881/68882 FPU, I did not realize it was any different than the 68881 that is accessible from the 68030.

Bob C

On Dec 3, 2015, at 12:23 PM, Thorsten Otto <halgara@xxxxxxxx> wrote:

The only FPU a Mega STE can have is a memory mapped one. As far as i can tell, this is not emulated at all, and i doubt that there are many programs that make use of it. The math library for GNU-C for example does not support it. Programs compiled with Pure-C might support it, but i guess that the ones where it might make a difference come in two flavours, one for 68k and another one for 68030+68881.

Emulating a memory mapped FPU might be difficult, at least i could not find too much documentation on the interface so far.

Bob Carpenter <hatari@xxxxxxxxxx> schrieb am 0:51 Donnerstag, 3.Dezember 2015:

After further investigation, I found that the FPU is only detected when you are running a 68030 CPU. That is why Doug is able to detect it. On the other hand, I rarely use the 68030. I was trying to more completely emulate a Mega STE that had a 68881 FPU.

Bob C