Data cache memory needs to be disabled before handing over control to linux kernel. This patch populates the cleanup_before_linux stub.
Signed-off-by: Vikas Manocha vikas.manocha@st.com --- arch/arm/cpu/armv7m/cpu.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/arch/arm/cpu/armv7m/cpu.c b/arch/arm/cpu/armv7m/cpu.c index 58cde93..a424bab 100644 --- a/arch/arm/cpu/armv7m/cpu.c +++ b/arch/arm/cpu/armv7m/cpu.c @@ -18,6 +18,25 @@ */ int cleanup_before_linux(void) { + /* + * this function is called just before we call linux + * it prepares the processor for linux + * + * disable interrupt and turn off caches etc ... + */ + disable_interrupts(); + /* + * turn off D-cache + * dcache_disable() in turn flushes the d-cache + * MPU is still enabled & can't be disabled as the u-boot + * code might be running in sdram which by default is not + * executable area. + */ + dcache_disable(); + /* invalidate to make sure no cache line gets dirty between + * dcache flushing and disabling dcache */ + invalidate_dcache_all(); + return 0; }