[Buildroot] [PATCH 03/14] RESEND: handle MMU configuration
Bernhard Reutner-Fischer
rep.dot.nop at gmail.com
Fri Oct 9 11:39:02 UTC 2009
On Fri, Oct 09, 2009 at 01:22:44PM +0200, Peter Korsgaard wrote:
>>>>>> "Thomas" == Thomas Petazzoni <thomas.petazzoni at free-electrons.com> writes:
>
> Thomas> Le Wed, 7 Oct 2009 23:27:47 +0200,
> Thomas> Bernhard Reutner-Fischer <rep.dot.nop at gmail.com> a écrit :
>
> >> +config BR2_HAVE_NOMMU
> >> + def_bool n
> >> + # assume that we have an MMU per default.
>
> Thomas> Maybe we should use BR2_HAVE_MMU, def_bool y. The
> Thomas> non-not-negative-if-not-options are really hard to understand.
>
>I guess the idea is that the architectures can 'select' this option
>behind the user's back. There's afaik nothing in kconfig to disable
Exactly. e.g.:
$ grep -B3 HAVE_NOMMU target/Config.in.arch
config BR2_m68k_cpu_68000
bool "68000"
select BR2_HAVE_NOMMU
config BR2_m68k_cpu_68010
bool "68010"
select BR2_HAVE_NOMMU
--
config BR2_m68k_cpu_coldfire_51qe
bool "51qe"
select BR2_HAVE_NOMMU
config BR2_m68k_cpu_coldfire_5202
bool "5202"
select BR2_HAVE_NOMMU
config BR2_m68k_cpu_coldfire_5204
bool "5204"
select BR2_HAVE_NOMMU
config BR2_m68k_cpu_coldfire_5206
bool "5206"
select BR2_HAVE_NOMMU
>another option if you enable something.
>
>You could ofcourse move the logic here instead of in the individual arch
>handling (E.G. default y if BR2_ARCH_bfin, or what it now is).
>
> >> +config BR2_USE_MMU
> >> + bool "Use MMU"
> >> + default y
> >> + depends on !BR2_HAVE_NOMMU
> >> + help
> >> + If your target has an MMU and you want to use it
> >> + then say Y here.
>
> Thomas> What's the usage of these two new options ?
>
>Yes, I would like to know this as well. I would imagine properly
>supporting nommu would take quite some more effort than this (E.G. most
>packages should get hidden).
why would you want to hide most of the package?
For a start, it only affects the binary format.
More information about the buildroot
mailing list