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List:       gentoo-embedded
Subject:    Re: [gentoo-embedded] Embedded stage - why kernels and headers 2.4 not 2.6?
From:       Mike Frysinger <vapier () gentoo ! org>
Date:       2007-12-24 20:34:49
Message-ID: 200712241534.50453.vapier () gentoo ! org
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On Wednesday 12 December 2007, Janusz Syrytczyk wrote:
> > Why all kernels below 2.5 are ok and others are masked?
>
> You look, you find:
>
> "unlike the default-linux and standard hardened profiles we felt it
> unneeded to force a 2.6 sub profile or we did not wish to have to
> maintain twice as many profiles. Also all the last releases
> were for all 2.4.x kernels. upgrading to 2.6.x is easy as -pie
> however.. Just update headers, uclibc, kernel and modules.
> Then go update everything else where needed. "

the other part is that unlike glibc, uClibc cannot (currently) build against 
2.6 headers and run on 2.4 kernels.  uClibc will use whatever features are 
available.  so if 2.6 has a newer way of doing something (like mount), then 
uClibc will use whatever your headers say.  but try to do it on an older 
system where the functionality is not available and you get runtime failures.  
glibc on the other hand builds support for every call ands will fallback to 
older and older methods until something works.
-mike

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