tree 9087d2aa75bc34f41290504025576434a1947786
parent faf144f4dfdda7334ea8634346dcc750bdd8ffb7
author Gerald Lejeune <gerald.lejeune@st.com> 1458635363 +0100
committer Gerald Lejeune <gerald.lejeune@st.com> 1459351583 +0200

Enable asynchronous abort exceptions during boot

Asynchronous abort exceptions generated by the platform during cold boot are
not taken in EL3 unless SCR_EL3.EA is set.

Therefore EA bit is set along with RES1 bits in early BL1 and BL31 architecture
initialisation. Further write accesses to SCR_EL3 preserve these bits during
cold boot.

A build flag controls SCR_EL3.EA value to keep asynchronous abort exceptions
being trapped by EL3 after cold boot or not.

For further reference SError Interrupts are also known as asynchronous external
aborts.

On Cortex-A53 revisions below r0p2, asynchronous abort exceptions are taken in
EL3 whatever the SCR_EL3.EA value is.

Fixes arm-software/tf-issues#368

Signed-off-by: Gerald Lejeune <gerald.lejeune@st.com>