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

[Wolfgang Denk]

Dear Stephen Warren,

In message <4F05D596.6030900 at nvidia.com> you wrote:
>
> > I will accept this only temporarily.  Why don't you use a working tool
> > chain instead, or fix the one you are using?
> 
> I believe the issue isn't that the toolchain is broken, but due to the
> mix of multiple CPU types on Tegra, all of which run the same U-Boot binary.

When we can solve this issue with our own version of the libgcc, then
we can also solve it by using a tool chain that provides the needed
lingcc code.

> U-Boot starts execution on the AVP CPU, an ARMv4(?) CPU. U-Boot then
> inits the main CPUs, ARMv7 Cortex A9s, and arranges for them to continue
> running U-Boot.

OK, so you have to use a tool chain which provides libgcc code for
armv4t systems.  What exactly is the problem here?

> The libraries included in the toolchain are built for the ARMv7 CPUs,

SO this is not the right tool chain for the job.  Ecactly what I said.

> 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.

No, this is NOT a solution, it is a workaround for an inappropriate
toolchain.  If you want to build code for an armv4t system, you must
use a tool chain that supports it.

Best regards,

Wolfgang Denk

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