[U-Boot] [PATCH 1/2] tegra2: Always build with USE_PRIVATE_LIBGCC=yes.

[Wolfgang Denk]

Dear Simon Glass,

In message <CAPnjgZ2wCqF2tPWwFUdKG7y_xDeYhbFrEnqXxRJG6eU7yj9Xug at mail.gmail.com> you wrote:
> 
> > The libraries included in the toolchain are built for the ARMv7 CPUs,
> > and hence fail to operate correctly when used by the portion of U-Boot
> > which runs on the ARMv4 CPU, presumably due to ISA differences. IIRC,
> > there are overrides in the U-Boot build process such that some/all of
> > U-Boot is built so it'll run on ARMv4 OK, which is why using libgcc
> > built by U-Boot solves this.
> 
> Yes that's right, but actually I have never delved into exactly why.
> Perhaps it is an integer divide or internal memcpy() call early in the
> code. We might be able to find the offending C library code, given
> enough time, and perhaps arrange not to call it. A little fragile
> though.

That would be the totally wrong approach.  Problems should be solved
where they originate.  Here this appears to be the tool chain, which
does not provide a version of libgcc suitable for amv4t
configurations.

Best regards,

Wolfgang Denk

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