2-3-add_arm_isms.patch

Have you checked with an architecture guru that sync_primitive() can
really be empty, not only for that arch in general, but also for
accesses to a mmapped region the way flashrom does it?

3-3-add_tegra2_spi_controller.patch
Not your fault, but we really need a way to detect the target
architecture in the Makefile. The issues of which SPI masters to include
for internal exists on all architectures. Any ideas? I experimented with
uname calls in the past, but that checks the host arch, not the target
arch. Grepping the preprocessor output for the compiler might be an option.
echo|gcc -dM -E -|grep "whatever\|arch\|defines"
Or you try this pretty straightforward solution:

Create a file arch.h with these contents:
#if defined (__i386__)
#define __FLASHROM_ARCH__ "x86"
#elif defined (__x86_64__)
#define __FLASHROM_ARCH__ "x86_64"
#elif defined (__mips) || defined (__mips__) || defined (_mips) ||
defined (mips)
#define __FLASHROM_ARCH__ "mips"
#elif defined(__powerpc__) || defined(__powerpc64__) || defined(__ppc__)
|| defined(__ppc64__)
#define __FLASHROM_ARCH__ "ppc"
#endif
__FLASHROM_ARCH__

Then run
gcc -E arch.h|grep -v ^#
The result on my machine will be
"x86"
Side note: Such an arch.h file (with some extensions) might save us from
having to check every possible arch define everywhere we need to
differentiate between architectures.

I will comment on the Tegra2 SPI driver later, we should get the
infrastructure questions addressed first.