On Wed, Apr 20, 2011 at 07:31:33PM +1000, Greg Ungerer wrote: > On 20/04/11 19:12, Philippe De Muyter wrote: >> On Wed, Apr 20, 2011 at 10:55:15AM +0200, Geert Uytterhoeven wrote: >>> On Wed, Apr 20, 2011 at 10:06, Sam Ravnborg<s...@ravnborg.org> wrote: >>>> Hi Greg. >>>> >>>>> + >>>>> +#if defined(__mc68020__) || defined(__mc68030__) || \ >>>>> + á ádefined(__mc68040__) || defined(__mc68060__) (*) >>>> >>>> Why use these to decide if this is MMU or not? >>>> This code is not exposed to user-space so we can rely on CONFIG_* >>>> symbols. >>>> IMO the CONIFG_* symbols is easier to read/maintain. >>> >>> Because technically it doesn't depend on having a MMU or not, but on >>> having >>> the full 32-bit multiplication instruction or not. >>> >>> Does Coldfire-with-MMU (for which we haven't integrated the support >>> yet) have that >>> instruction? >> >> Actually, MCF547x& MCF548x (CFv4e family) are integrated but without (*) >> their >> limited MMU functionality. >> >> freescale had even written an mmu port for 2.6.25 but has not pushed it >> upstream. This port can be found on their site or in the openwrt >> repository. > > Part of my plan with the merge of m68k and m68knommu is to make > it easy to support the v4e parts with MMU enabled. And certainly as > I work through cleaning the individual files up I am doing it > with this in mind. Of course most of the code to support the v4e > is the same no matter if you have the MMU enabled or not. > > I have Freescales 2.6.25 kernel, but it is really only a reference > point for this work. > >> MCF547x& MCF548x do not have that instruction. (*) > > Thats right. I believe the processors listed in the patch are > the only ones that currently support the 64bit mul.
The 68340 has it also. (And I have an old linux port for this processor) I surmise the 68360 has it also. Philippe (*) Greg, there must be something with your mail installation : it garbles the messages. (or is it mine, but I noticed that only with replies from you ?) _______________________________________________ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
