[Buildroot] [PATCH 3/7] toolchain: add a USE_MMU build option

Mike Frysinger vapier at gentoo.org
Fri Jan 14 22:17:41 UTC 2011


On Friday, January 14, 2011 16:53:38 Peter Korsgaard wrote:
> >>>>> "Mike" == Mike Frysinger <vapier at gentoo.org> writes:
> Hi,
> 
>  >> What archs currently have working nommu support in uClibc?
> 
>  Mike> any arch can be built as "nommu".  it simply means certain
>  Mike> functions are not enabled (like fork) while others are not as
>  Mike> complicated (like malloc).  so there is no technical limitation
>  Mike> that only certain arches support nommu.  -mike
> 
> Naturally, but which one are used in the wild? E.G. what is supported by
> linux-2.6.37 and uClibc-0.9.32-rc1 ?

again, you can run any "nommu" userland with a kernel with the mmu running.  
if you're asking which arches in mainline linux kernel allow people to build 
with CONFIG_MMU disabled, you're talking about arm, blackfin, frv, h8300, 
m32r, m68k, microblaze, mips, sh, and xtensa.  i dont believe there is any 
limitation in uClibc and if there is, that's easy enough to fix.  nommu is 
merely a subset of mmu functionality from userspace's perspective.
-mike
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