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m68k: enabled software emulation of separate supervisor/user stack
Recent Coldfires have separate supervisor and user stack pointers, but
since older Coldfires didn't have that, the Linux kernel has a kind of
emulation mechanism for those pointers.
Apparently, according to the Kconfig.cpu file, the 5208 is supposed to
support such separate pointers, but Qemu doesn't implement it. So we
cheat a bit here and force the usage of emulated separate stack
pointers.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
diff -Nur linux-3.17.7.orig/arch/m68k/Kconfig.cpu linux-3.17.7/arch/m68k/Kconfig.cpu
--- linux-3.17.7.orig/arch/m68k/Kconfig.cpu 2014-12-16 11:37:26.000000000 -0600
+++ linux-3.17.7/arch/m68k/Kconfig.cpu 2014-12-27 14:12:19.291459730 -0600
@@ -146,6 +146,7 @@
depends on !MMU
select GENERIC_CLOCKEVENTS
select HAVE_CACHE_SPLIT
+ select COLDFIRE_SW_A7
help
Freescale Coldfire 5207/5208 processor support.
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