Re: TSCs are a no-no on i386

From: Maciej W. Rozycki (macro@ds2.pg.gda.pl)
Date: Wed Jul 30 2003 - 09:18:11 EST


On Wed, 30 Jul 2003, Jan-Benedict Glaw wrote:

> This small patch fixes a long-standing problem for bare i386 CPUs. These
> don't have TSCs and so, a recent 2.4.x kernel will simply halt the

 Actually i486 processors and some Pentium-like clones have none, too.

> machine leaving a text like "This CPU has no TSC feature (ie was
> compiled for Pentium+) but I do depend on it".

 That only happens if you change existing .config -- it may happen for all
options that are unset instead of being set to "n" -- and it can be worked
around by running `make oldconfig' twice.

> Please apply. Worst to say, even Debian seems to start using i486+
> features (ie. libstdc++5 is SIGILLed on Am386 because there's no
> "lock" insn available)...

 You need the change for CONFIG_M486 and CONFIG_M586 as well.

-- 
+  Maciej W. Rozycki, Technical University of Gdansk, Poland   +
+--------------------------------------------------------------+
+        e-mail: macro@ds2.pg.gda.pl, PGP key available        +

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