Make SCP_BL2(U) image loading configurable on CSS platforms
Current code mandates loading of SCP_BL2/SCP_BL2U images for all
CSS platforms. On future ARM CSS platforms, the Application
Processor (AP) might not need to load these images. So, these
items can be removed from the FIP on those platforms.
BL2 tries to load SCP_BL2/SCP_BL2U images if their base
addresses are defined causing boot error if the images are not
found in FIP.
This change adds a make flag `CSS_LOAD_SCP_IMAGES` which if set
to `1` does:
1. Adds SCP_BL2, SCP_BL2U images to FIP.
2. Defines the base addresses of these images so that AP loads
them.
And vice-versa if it is set to `0`. The default value is set to
`1`.
Change-Id: I5abfe22d5dc1e9d80d7809acefc87b42a462204a
diff --git a/include/plat/arm/css/common/css_def.h b/include/plat/arm/css/common/css_def.h
index 79bb44c..aa802a5 100644
--- a/include/plat/arm/css/common/css_def.h
+++ b/include/plat/arm/css/common/css_def.h
@@ -97,6 +97,13 @@
************************************************************************/
/*
+ * The loading of SCP images(SCP_BL2 or SCP_BL2U) is done if there
+ * respective base addresses are defined (i.e SCP_BL2_BASE, SCP_BL2U_BASE).
+ * Hence, `CSS_LOAD_SCP_IMAGES` needs to be set to 1 if BL2 needs to load
+ * an SCP_BL2/SCP_BL2U image.
+ */
+#if CSS_LOAD_SCP_IMAGES
+/*
* Load address of SCP_BL2 in CSS platform ports
* SCP_BL2 is loaded to the same place as BL31. Once SCP_BL2 is transferred to the
* SCP, it is discarded and BL31 is loaded over the top.
@@ -104,6 +111,7 @@
#define SCP_BL2_BASE BL31_BASE
#define SCP_BL2U_BASE BL31_BASE
+#endif /* CSS_LOAD_SCP_IMAGES */
#define PLAT_ARM_SHARED_RAM_CACHED MHU_PAYLOAD_CACHED