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MIPS: Ensure Config.K0=2 applies before any memory accesses

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During boot we set Config.K0=2 (uncached) such that any accesses to the
kseg0 memory region are performed uncached before the caches are
initialised. This write to the Config register introduces an execution
hazard between it & any following memory accesses (such as the load of
_gp), which we need to clear in order to ensure those memory accesses
are actually performed uncached. Clear this execution hazard with the
insertion of an ehb execution hazard barrier instruction.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
This commit is contained in:
Paul Burton 2016-09-21 11:18:57 +01:00 committed by Daniel Schwierzeck
parent 566ce04de4
commit c5b8412d60
1 changed files with 1 additions and 0 deletions
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arch/mips/cpu/start.S
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@ -127,6 +127,7 @@ reset:
and t0, t0, MIPS_CONF_IMPL
or t0, t0, CONF_CM_UNCACHED
mtc0 t0, CP0_CONFIG
ehb
#endif
/*