target/m68k/qemu-m68k/patches/3.18.14/qemu-coldfire.patch

   1 m68k: enabled software emulation of separate supervisor/user stack
   2
   3 Recent Coldfires have separate supervisor and user stack pointers, but
   4 since older Coldfires didn't have that, the Linux kernel has a kind of
   5 emulation mechanism for those pointers.
   6
   7 Apparently, according to the Kconfig.cpu file, the 5208 is supposed to
   8 support such separate pointers, but Qemu doesn't implement it. So we
   9 cheat a bit here and force the usage of emulated separate stack
  10 pointers.
  11
  12 Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
  13
  14 diff -Nur linux-3.17.7.orig/arch/m68k/Kconfig.cpu linux-3.17.7/arch/m68k/Kconfig.cpu
  15 --- linux-3.17.7.orig/arch/m68k/Kconfig.cpu     2014-12-16 11:37:26.000000000 -0600
  16 +++ linux-3.17.7/arch/m68k/Kconfig.cpu  2014-12-27 14:12:19.291459730 -0600
  17 @@ -146,6 +146,7 @@
  18         depends on !MMU
  19         select GENERIC_CLOCKEVENTS
  20         select HAVE_CACHE_SPLIT
  21 +       select COLDFIRE_SW_A7
  22         help
  23            Freescale Coldfire 5207/5208 processor support.
  24