Re: CVS commit: src/sys/arch

[ Moving discussion to tech-userlevel ]

> On Aug 5, 2026, at 7:03 PM, Nat Sloss <[email protected]> wrote:
> 
> Hi Jason,
>  > All M68040 configs require FPSP...
>  Not necessarily true if you prefer to run soft float.
>  My current kernel config has options M68030 and M68040 which I use with a soft float userland.
>  Also I don't think FPSP is required for an LC040 when used with options FPU_EMULATE.
>  Attached is my attempt at addressing this....It would mean changing every existing instance of M68040 to options M68040HF :(

I was about to suggest - “just use ’no options FPSP’!”, but then I noticed that config(1) doesn’t handle that if the option is a depended-option.  Oops!

I think I’d like to make config(1) handle this case so that the implied FPSP / M060SP options work, but folks like yourself who want to elide it can do so.

Looks like the changes to config(1) will be small.  Because option dependencies are done as a separate pass after parsing the config file, what I’ll need to do is keep track of every option explicitly de-selected in the config file with a “no option” statement, and then consult that table when processing the depended-options.

Sound reasonable?

>   Removing FPSP on a kernel with FPU_EMULATE reduced the kernel size ~200kB of much needed memory.
>   Best regards,
>   Nat
>


-- thorpej

diff -r df3433e23614 sys/arch/m68k/conf/files.m68k
--- a/sys/arch/m68k/conf/files.m68k	Wed Aug 05 01:43:11 2026 +0000
+++ b/sys/arch/m68k/conf/files.m68k	Thu Aug 06 11:53:18 2026 +1000
@@ -25,7 +25,8 @@
 defflag	opt_m68k_arch.h		M68010
 defflag	opt_m68k_arch.h		M68020: M68K_FPCOPROC
 defflag	opt_m68k_arch.h		M68030: M68K_MMU_68030, M68K_FPCOPROC
-defflag	opt_m68k_arch.h		M68040: M68K_MMU_68040, M68K_FPCOPROC, FPSP
+defflag	opt_m68k_arch.h		M68040: M68K_MMU_68040, M68K_FPCOPROC
+defflag	opt_m68k_arch.h		M68040HF: M68040, FPSP
 defflag	opt_m68k_arch.h		M68060: M68K_MMU_68060, M68K_FPCOPROC, M060SP
 
 # Emit Makefile vars for these kernel options so that compiler flags