1 files changed, 69 insertions, 6 deletions

diff --git a/meta-xilinx-core/conf/machine/README b/meta-xilinx-core/conf/machine/README
index 5361dc81..de8cf58d 100644
--- a/meta-xilinx-core/conf/machine/README
+++ b/meta-xilinx-core/conf/machine/README
@@ -142,20 +142,83 @@ you should not use :<machine> override values for the same reason.  Note,
 not every machine file will have all of these variables, only the ones
 you need to override should be set.
 
+Variables set before required inclusion file:
+Variables that changes based on hw design or board specific requirement must be
+set before required inclusion file else pre-expansion value defined in generic
+machine conf will be set. This way user can also override these variables from
+local.conf
+
 System wide setting:
 TUNE_FEATURES:tune-<tune> - Specific tune features
 
 external-hdf recipe from meta-xilinx-tools:
-HDF_MACHINE - Used by the  recipe to find the correct XSA
-HDF_EXT - only xsa is supported, legacy variable
-HDF_BASE - protocol if not using the default external-hdf repository
-HDF_PATH - path to the repository or XSA file
+HDF_MACHINE - Machine to load from reference defign xsa using hdf-examples recipe
+HDF_EXT - Only ".xsa" externsion is supported, legacy variable.
+HDF_BASE - Download protocol (file://, git://, http:// or https://) protocol if
+    not using the default external-hdf repository.
+HDF_PATH - Path to the repository or XSA file
+
+fs-boot recipe from meta-xilinx-tools:
+YAML_SERIAL_CONSOLE_STDIN:pn-fs-boot - YAML based uart stdin configuration for
+MicroBlaze. Example: axi_uartlite_0 or axi_uart16550_0 etc,.
+YAML_SERIAL_CONSOLE_STDOUT:pn-fs-boot - YAML based uart stdout configuration for
+MicroBlaze. Example: axi_uartlite_0 or axi_uart16550_0 etc,.
+YAML_MAIN_MEMORY_CONFIG:pn-fs-boot - YAML based DDR4 or MIG configuration for
+MicroBlaze. Example: DDR4_0 or MIG_7SERIES_0 etc,.
+YAML_FLASH_MEMORY_CONFIG:pn-fs-boot - YAML based flash configuration for
+MicroBlaze. Example: axi_emc_0 or axi_quad_spi_0 etc,.
+XSCTH_PROC:pn-fs-boot - Processor IP used while configuring embeddedsw compoments.
+Example: microblaze_0 or microblaze_1 etc,.
+
+fsbl-firmware recipe from meta-xilinx-tools:
+YAML_SERIAL_CONSOLE_STDIN:pn-fsbl-firmware - YAML based FSBL uart stdin configuration
+for Zynq-7000 and ZynqMP devices.
+YAML_SERIAL_CONSOLE_STDOUT:pn-fsbl-firmware - YAML based FSBL uart stdout configuration
+for Zynq-7000 and ZynqMP devices.
+
+pmu-firmware recipe from meta-xilinx-tools:
+YAML_SERIAL_CONSOLE_STDIN:pn-pmu-firmware - YAML based PMUFW uart stdin configuration
+for ZynqMP devices.
+YAML_SERIAL_CONSOLE_STDOUT:pn-pmu-firmware - YAML based PMUFW uart stdout configuration
+for ZynqMP devices.
+
+plm-firmware recipe from meta-xilinx-tools:
+YAML_SERIAL_CONSOLE_STDIN:pn-plm-firmware - YAML based PLM uart stdin configuration
+for Versal devices.
+YAML_SERIAL_CONSOLE_STDOUT:pn-fplmsbl-firmware - YAML based PLM uart stdout
+configuration for Versal devices.
 
 device-tree recipe from meta-xilinx-tools:
-YAML_DT_BOARD_FLAGS - flags used for dtgen
+YAML_CONSOLE_DEVICE_CONFIG:pn-device-tree - YAML based uart console configuration
+for all device families. Example: axi_uartlite_0 or psu_uart_0 etc,.
+YAML_MAIN_MEMORY_CONFIG:pn-device-tree - YAML based memory configuration for all
+device families. Example: DDR4_0 or PS7_DDR_0 or PSU_DDR_0 etc,.
+XSCTH_PROC:pn-device-tree - Processor IP used while configuring device-tree
+compoments. Example: microblaze_0 or microblaze_1 etc,.
+YAML_DT_BOARD_FLAGS:pn-device-tree - YAML based configuration for setting eval
+board specific dtsi files available in DTG repo.
+
+arm-trusted-firmware recipe from meta-xilinx-core:
+ATF_CONSOLE - Uart console configuration for all aarch64 device families.
+Example: pl011 or cadence or cadence1 etc,.
+TFA_BL33_LOAD - BL33 preloadded base address to EXTRA_OEMAKE for aarch64.
 
 u-boot-xlnx recipe from meta-xilinx-core:
 UBOOT_MACHINE - Name of the defconfig to use
-HAS_PLATFORM_INIT - List of defconfig files available for u-boot
+HAS_PLATFORM_INIT - List of defconfig files available for u-boot only for SPL boot.
+
+u-boot-xlnx-scr recipe from meta-xilinx-core:
+DDR_BASEADDR - Base address for DDR used for loading the images from u-boot env.
+SKIP_APPEND_BASEADDR - Skip appending ${DDR_BASEADDR} for image offsets.
+
+Varibable set after required inclusion file:
+Varibables that does not intend to change must be set before required inclusion
+file.
+
+external-hdf recipe from meta-xilinx-tools:
+HDF_MACHINE - Used by the  recipe to find the correct XSA
+HDF_EXT - only xsa is supported, legacy variable
+HDF_BASE - protocol if not using the default external-hdf repository
+HDF_PATH - path to the repository or XSA file
 
 ...and more...