doc: Update BL1 and BL2 boot flow

Updated the document for BL1 and BL2 boot flow to capture
below changes made in FCONF

1. Loading of fw_config and tb_fw_config images by BL1.
2. Population of fw_config and tb_fw_config by BL2.

Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: Ifea5c61d520ff1de834c279ce1759b53448303ba

3 files changed, 56 insertions, 19 deletions

diff --git a/docs/components/fconf/index.rst b/docs/components/fconf/index.rst
index 0da56ec3b..902063356 100644
--- a/docs/components/fconf/index.rst
+++ b/docs/components/fconf/index.rst
@@ -49,8 +49,10 @@ Hence each ``populate()`` function must be registered with a specific
 configuration properties which is usually a device tree file.
 
 Example:
+ - FW_CONFIG: properties related to base address, maximum size and image id
+   of other DTBs etc.
  - TB_FW: properties related to trusted firmware such as IO policies,
-   base address of other DTBs, mbedtls heap info etc.
+   mbedtls heap info etc.
  - HW_CONFIG: properties related to hardware configuration of the SoC
    such as topology, GIC controller, PSCI hooks, CPU ID etc.
 
@@ -88,9 +90,10 @@ explain how the properties are described for a specific backend. Refer to the
 Loading the property device tree
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-The ``fconf_load_config()`` must be called to load the device tree containing
-the properties' values. This must be done after the io layer is initialized, as
-the |DTB| is stored on an external device (FIP).
+The ``fconf_load_config(image_id)`` must be called to load fw_config and
+tb_fw_config devices tree containing the properties' values. This must be done
+after the io layer is initialized, as the |DTB| is stored on an external
+device (FIP).
 
 .. uml:: ../../resources/diagrams/plantuml/fconf_bl1_load_config.puml
 
diff --git a/docs/resources/diagrams/plantuml/fconf_bl1_load_config.puml b/docs/resources/diagrams/plantuml/fconf_bl1_load_config.puml
index e613eefd0..e513ed4c3 100644
--- a/docs/resources/diagrams/plantuml/fconf_bl1_load_config.puml
+++ b/docs/resources/diagrams/plantuml/fconf_bl1_load_config.puml
@@ -13,6 +13,7 @@ end box
 
 box "platform common code"
 	participant plat_bl1_common
+	participant fconf_dyn_cfg_getter
 	participant fconf
 end box
 
@@ -20,12 +21,17 @@ bl1_main -> fvp_bl1_setup : bl1_platform_setup()
 fvp_bl1_setup -> arm_bl1_setup : arm_bl1_platform_setup()
 arm_bl1_setup -> arm_io_storage : plat_arm_io_setup()
 note over arm_io_storage : register and setup fip
-arm_bl1_setup -> fconf : fconf_load_config()
+arm_bl1_setup -> fconf : set_fw_config_info(fw_config_base, max_size)
+note over fconf
+	set fw_config information
+	(address, size, image_id)
+	in global dtb_infos array.
+end note
 activate fconf
-	note over fconf
-		create and populate an
-		image_desc_t for FW_CONFIG
-	end note
+	arm_bl1_setup -> fconf : fconf_load_config(FW_CONFIG_ID)
+	fconf -> fconf : FCONF_GET_PROPERTY(dyn_cfg, dtb, FW_CONFIG_ID)
+	fconf -> fconf_dyn_cfg_getter: dyn_cfg_dtb_info_getter(FW_CONFIG_ID)
+	fconf_dyn_cfg_getter -> fconf: fw_config_info
 	fconf -> bl_common : load_auth_image(FW_CONFIG_ID, &image_info)
 	activate bl_common
 	note over bl_common
@@ -33,18 +39,38 @@ activate fconf
 		with info from plat_io_policy
 	end note
 	bl_common -> arm_io_storage
-	arm_io_storage -> fconf: FCONF_GET_PROPERTY(arm, arm_io_policies, tb_fw_cfg)
-	note over fconf: use staticaly defined policies in bl1
+	arm_io_storage -> fconf: FCONF_GET_PROPERTY(arm, arm_io_policies, FW_CONFIG_ID)
+	note over fconf: use statically defined policies in bl1
+	fconf <- bl_common : image_info
+	deactivate bl_common
+	note over fconf : get fw_config_dtb from image_info
+	arm_bl1_setup -> fconf: FCONF_GET_PROPERTY(dyn_cfg, dtb, FW_CONFIG_ID)
+	fconf -> fconf_dyn_cfg_getter: dyn_cfg_dtb_info_getter(FW_CONFIG_ID)
+	fconf_dyn_cfg_getter -> arm_bl1_setup: fw_config_info
+	arm_bl1_setup -> fconf_dyn_cfg_getter: populate_dtb_registry(uintptr_t dtb)
+	arm_bl1_setup -> fconf: fconf_load_config(TB_FW_CONFIG_ID)
+	fconf -> fconf : FCONF_GET_PROPERTY(dyn_cfg, dtb, TB_FW_CONFIG_ID)
+	fconf -> fconf_dyn_cfg_getter: dyn_cfg_dtb_info_getter(TB_FW_CONFIG_ID)
+	fconf_dyn_cfg_getter -> fconf: tb_fw_config_info
+	fconf -> bl_common : load_auth_image(TB_FW_CONFIG_ID, &image_info)
+	activate bl_common
+	note over bl_common
+		load and auth image from fip
+		with info from plat_io_policy
+	end note
+	bl_common -> arm_io_storage
+	arm_io_storage -> fconf: FCONF_GET_PROPERTY(arm, arm_io_policies, TB_FW_CONFIG_ID)
+	note over fconf: use statically defined policies in bl1
 	fconf <- bl_common : image_info
 	deactivate bl_common
 	note over fconf : get tb_fw_config_dtb from image_info
-	fconf -> plat_bl1_common : bl1_plat_get_image_desc(BL2_IMAGE_ID)
-	fconf <- plat_bl1_common : BL2_IMAGE_DESC
-	note over fconf
-		set ep_info.args.arg0 of BL2_IMAGE_DESC
-		to FW_CONFIG base address
+	fconf -> arm_bl1_setup
+	arm_bl1_setup -> plat_bl1_common : bl1_plat_get_image_desc(BL2_IMAGE_ID)
+	arm_bl1_setup <- plat_bl1_common : BL2_IMAGE_DESC
+	note over arm_bl1_setup
+	set ep_info.args.arg0 of BL2_IMAGE_DESC
+	to FW_CONFIG base address
 	end note
-arm_bl1_setup <- fconf
 deactivate fconf
 
 == load & auth, prepare and jump to BL2 ==
diff --git a/docs/resources/diagrams/plantuml/fconf_bl2_populate.puml b/docs/resources/diagrams/plantuml/fconf_bl2_populate.puml
index 881f25343..c536ee090 100644
--- a/docs/resources/diagrams/plantuml/fconf_bl2_populate.puml
+++ b/docs/resources/diagrams/plantuml/fconf_bl2_populate.puml
@@ -8,6 +8,7 @@ end box
 box "platform common code"
 	participant fconf
 	participant fconf_tbbr_getter
+participant fconf_dyn_cfg_getter
 end box
 
 box "arm platform code" #LightBlue
@@ -25,10 +26,17 @@ note over arm_bl2_setup
 end note
 arm_bl2_setup -> arm_bl2_setup : arm_bl2_early_platform_setup(\n\t fw_config, mem_layout)
 activate arm_bl2_setup
-	arm_bl2_setup -> fconf: fconf_polulate("TB_FW", fw_config)
+	arm_bl2_setup -> fconf: fconf_populate("FW_CONFIG", fw_config)
 	activate fconf
+		fconf -> fconf_dyn_cfg_getter: populate_dtb_registry(uintptr_t dtb)
+		note over fconf_dyn_cfg_getter: read dtb_registry properties from dtb
+		fconf_dyn_cfg_getter -> arm_bl2_setup
+		arm_bl2_setup -> fconf: FCONF_GET_PROPERTY(dyn_cfg, dtb, TB_FW_CONFIG_ID)
+		fconf -> fconf_dyn_cfg_getter: dyn_cfg_dtb_info_getter(TB_FW_CONFIG_ID)
+		fconf_dyn_cfg_getter -> arm_bl2_setup: tb_fw_config_info
+		arm_bl2_setup -> fconf: fconf_populate("TB_FW_CONFIG", tb_fw_config)
 		fconf -> fconf_tbbr_getter: fconf_populate_tbbr_dyn_config(uintptr_t dtb)
-		note over fconf_tbbr_getter: read tbbr propeties from dtb
+		note over fconf_tbbr_getter: read tbbr properties from dtb
 		fconf -> arm_fconf_io: fconf_populate_arm_io_policies(uintptr_t dtb)
 		note over arm_fconf_io: read arm io propeties from dtb
 	deactivate fconf