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    SubjectRe: [PATCH] arm: remove unused code in delay.S
    Russell King - ARM Linux wrote:
    > On Tue, Sep 15, 2009 at 11:04:37PM +0200, Krzysztof Halasa wrote:
    > > Steve Chen <schen@mvista.com> writes:
    > >
    > > > +config OLD_CPU_DELAY
    > > > + depends on CPU_32v3 || CPU_32v4 || CPU_32v4T
    > > > + bool "Accurate delays"
    > > > + def_bool n
    > > > + help
    > > > + Enable if observing longer than expected delays and need more
    > > > + accuracy. This only applies to older CPUs.
    > > > +
    > >
    > > If it's that simple then why not enable the extra delay code
    > > unconditionally when compiling for those CPUs?
    >
    > Because it's really not that clear cut. Eg, ARM610 and ARM710 work
    > better with it, but StrongARM suffers from delays being too short.
    > Having a kernel configured for all those processors used to be common
    > (since the Acorn RiscPC had pluggable CPU cards, which could be one
    > of those processors.)
    >
    > It's really something that only experienced people should worry
    > about, and not Joe "kernel-builder" Bloggs.

    I'm confused now. If I'm building a "generic" kernel to run on
    several different systems, including some ARM710s and some StrongARMs,
    do I include the code or not?

    Btw, do you know where PT110 fits in? Is it like StrongARM (SA110)?

    Thanks,
    -- Jamie



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