feat(fvp): enable kernel dt convention
Enable USE_KERNEL_DT_CONVENTION for the FVP platform to pass the DT blob
(DTB) in x0 to BL33. This aligns with the Linux boot protocol as
described in Documentation/arm64/booting.rst.
In addition:
- Clean up legacy ARM_LINUX_KERNEL_AS_BL33 handling since
USE_KERNEL_DT_CONVENTION now implies this mode for DT handoff.
- Override args.arg0 for BL33 to point to ARM_PRELOADED_DTB_BASE in
RESET_TO_BL31.
- Skip setting the primary MPID in x0 when using this convention.
Change-Id: Ieea8cfe68104b82038b9311613abf13afe7b48f1
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
diff --git a/plat/arm/common/arm_bl2_setup.c b/plat/arm/common/arm_bl2_setup.c
index 668e34d..946af3b 100644
--- a/plat/arm/common/arm_bl2_setup.c
+++ b/plat/arm/common/arm_bl2_setup.c
@@ -271,8 +271,10 @@
#endif
case BL33_IMAGE_ID:
+#if !USE_KERNEL_DT_CONVENTION
/* BL33 expects to receive the primary CPU MPID (through r0) */
bl_mem_params->ep_info.args.arg0 = 0xffff & read_mpidr();
+#endif /* !USE_KERNEL_DT_CONVENTION */
bl_mem_params->ep_info.spsr = arm_get_spsr_for_bl33_entry();
break;