README: Add information related to multiconfig

Add information related to multiconfig

Signed-off-by: Manjukumar Matha <manjukumar.harthikote-matha@xilinx.com>

1 files changed, 35 insertions, 0 deletions

diff --git a/meta-xilinx-bsp/README.building.md b/meta-xilinx-bsp/README.building.md
index e0e3f264..54d61c3d 100644
--- a/meta-xilinx-bsp/README.building.md
+++ b/meta-xilinx-bsp/README.building.md
@@ -11,9 +11,14 @@ configure `bblayers.conf` by adding the `meta-xilinx-bsp` and
         BBLAYERS ?= " \
                 <path to layer>/oe-core/meta \
                 <path to layer>/meta-xilinx-bsp \
+                <path to layer>/meta-xilinx-standalone \
                 <path to layer>/meta-xilinx-contrib \
                 "
 
+meta-xilinx-standalone layer provides recipes which enable building baremetal
+toolchain for PMU firmware. This layer is required for ZU+ devices which
+depends on PMU firmware
+
 meta-xilinx-contrib is a contribution layer and is optional.
 
 To build a specific target BSP configure the associated machine in `local.conf`:
@@ -27,6 +32,36 @@ Build the target file system image using `bitbake`:
 Once complete the images for the target machine will be available in the output
 directory `tmp/deploy/images/<machine name>/`.
 
+Using multiconfig to build ZU+
+------------------------------
+
+multiconfig dependency has to be added in image file or local.conf.
+For example in core-image-minimal you will need  
+do_image[mcdepends] = "multiconfig:zcu102:pmu:pmu-firmware:do_deploy"
+
+Add conf/multiconfig in the build directory and create pmu.conf and zcu102.conf
+
+Add the following in pmu.conf:  
+        MACHINE="zynqmp-pmu"  
+        DISTRO="xilinx-standalone"  
+        GCCVERSION="7.%"  
+        TMPDIR="${TOPDIR}/pmutmp"  
+
+Add the following in zcu102.conf:  
+        MACHINE="zcu102-zynqmp"  
+        DISTRO="poky"  
+
+In local.conf multiconfig is enabled by: BBMULTICONFIG ?= "zcu102 pmu"
+
+bitbake multiconfig:zcu102:core-image-minimal  
+
+More information about multiconfig:
+https://www.yoctoproject.org/docs/current/mega-manual/mega-manual.html#dev-building-images-for-multiple-targets-using-multiple-configurations
+
+Workaround:  
+There is additional workaround required in u-boot-xlnx recipe. Add the below dependency  
+do_compile[mcdepends] = "multiconfig:zcu102:pmu:pmu-firmware:do_deploy"
+
 Additional Information
 ----------------------