Driver compilation for amd64

[Joseph Koshy]

> Is it possible to cross-compile a driver on an i386 platform
> for amd64, and if possible, how should I do that?

You can cross-compile an entire kernel by setting the
TARGET_ARCH variable appropriately.  See also the
description in build(7) of the TARGET_ARCH variable and
the 'buildenv', 'toolchain' and 'kernel-toolchain'
targets.

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