Update the README

README.adoc

@@ -72,16 +72,31 @@ The TMP directory *should be changed*. It receives all the outputs of the build.
     # TMP is not on a NFS, so not on home
     TMPDIR = "/put/some/path/"
 
-The following lines shall be set to accomodate the firmware project. Put the names of all the Fimrware variants and a path where the `.xsa` and `.mapt` files can be fetched.
+The following lines shall be set to accomodate the firmware project. Put the names of all the Firmware variants and a path where the `.xsa` and `.mapt` files can be fetched.
 
     # PL VARIANTS
     HDF_BASE="file://"
     PL_VARIANTS_damc-fmc2zup = "FofbNode_CellNode FofbNode_CentralNode FofbNode_CellNode_test FofbNode_CentralNode_test"
     PL_VARIANTS_DIR =  "/home/sources/diagnostics/broucquart/YOCTO_FOFB/build_damc_fofb/variants_hdf"
 
+==== Linking variant files
+
+The script `build_damc_fofb/variants_hdf/install_link.py` can help to install automatically the links to the `.xsa` and `.mapt` files.
+It is based on the tag and name. You need to edit the path that are hard coded at the begining of this script.
+Then the links can be automatically switched to new version calling this script.
+
+    # For centralnode, test firmware, point to tag 2.1
+    # if there are tags 2.1.0 and 2.1.3 it will point to te latter
+    ./build_damc_fofb/variants_hdf/install_link.py --test central 2.1
+
+    # For cellnode, standard firmware, point to tag 3
+    # if there are tags 3.1.0 and 3.4.3 it will point to te latter
+    ./build_damc_fofb/variants_hdf/install_link.py cell 3
+
 ==== Building
 
-To setup the environment, use the setupsdk script
+To setup the environment, use the setupsdk script.
+This will automatically cd in build_damc_fofb directory
 
     source setupsdk build_damc_fofb
 
@@ -89,3 +104,8 @@ Start the build for the image
 
     bitbake zup-image-soleil-fofb
 
+=== Preparing SD image and filesystem
+
+The system fit in a 8GB SD card.
+The script `makesd/prepare-sd.sh` can partition, format and copy files to the SD card.
+The script `makesd/bring_files.sh` needs to be adjusted but list the files required to be shipped in the SD card.