The BL31 expects the GIC to be uninitialized. Thus, if we are loading the BL31 by the SPL we must not initialize it. If u-boot is loaded by the SPL directly, it will initialize the GIC again (in the same lowlevel_init()).
This was tested on a custom board with SPL loading the BL31 and jumping to u-boot as BL33 as well as loading u-boot directly by the SPL. In case the ATF BL1/BL2 is used, this patch won't change anything, because no SPL is used at all.
Signed-off-by: Michael Walle michael@walle.cc --- arch/arm/cpu/armv8/fsl-layerscape/lowlevel.S | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/lowlevel.S b/arch/arm/cpu/armv8/fsl-layerscape/lowlevel.S index a519f6ed67..d8803738f1 100644 --- a/arch/arm/cpu/armv8/fsl-layerscape/lowlevel.S +++ b/arch/arm/cpu/armv8/fsl-layerscape/lowlevel.S @@ -192,6 +192,7 @@ ENTRY(lowlevel_init) #endif
/* Initialize GIC Secure Bank Status */ +#if !defined(CONFIG_SPL_BUILD) #if defined(CONFIG_GICV2) || defined(CONFIG_GICV3) branch_if_slave x0, 1f bl get_gic_offset @@ -205,6 +206,7 @@ ENTRY(lowlevel_init) bl gic_init_secure_percpu #endif #endif +#endif
100: branch_if_master x0, x1, 2f