armv8: layerscape: Make U-Boot EL2 safe
When U-Boot boots from EL2, skip some lowlevel init code requiring
EL3, including CCI-400/CCN-504, trust zone, GIC, etc. These
initialization tasks are carried out before U-Boot runs. This applies
to the RAM version image used for SPL boot if PPA is loaded first.
Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/ppa.c b/arch/arm/cpu/armv8/fsl-layerscape/ppa.c
index 26c47a1..35c612d 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/ppa.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/ppa.c
@@ -32,6 +32,7 @@
int ppa_init(void)
{
+ unsigned int el = current_el();
void *ppa_fit_addr;
u32 *boot_loc_ptr_l, *boot_loc_ptr_h;
int ret;
@@ -45,6 +46,12 @@
#endif
#endif
+ /* Skip if running at lower exception level */
+ if (el < 3) {
+ debug("Skipping PPA init, running at EL%d\n", el);
+ return 0;
+ }
+
#ifdef CONFIG_SYS_LS_PPA_FW_IN_XIP
ppa_fit_addr = (void *)CONFIG_SYS_LS_PPA_FW_ADDR;
debug("%s: PPA image load from XIP\n", __func__);