karo: configs: Update the tx6*_defconfig files from defconfigs generated with 'make...

[karo-tx-uboot.git] / doc / README.commands

diff --git a/doc/README.commands b/doc/README.commands
index 27815d2ba18faada4344e68ed65ac3b188569797..afd5577b0a9ce66b86c52f7cae595eb7d914e556 100644 (file)
--- a/doc/README.commands
+++ b/doc/README.commands
@@ -15,17 +15,22 @@ help:        Long description. This is a string
 
 **** Behind the scene ******
 
-The structure created is named with a special prefix (__u_boot_cmd_)
-and placed by the linker in a special section.
+The structure created is named with a special prefix and placed by
+the linker in a special section using the linker lists mechanism
+(see include/linker_lists.h)
 
 This makes it possible for the final link to extract all commands
 compiled into any object code and construct a static array so the
-command can be found in an array starting at __u_boot_cmd_start.
+command array can be iterated over using the linker lists macros.
+
+The linker lists feature ensures that the linker does not discard
+these symbols when linking full U-Boot even though they are not
+referenced in the source code as such.
 
 If a new board is defined do not forget to define the command section
-by writing in u-boot.lds ($(TOPDIR)/board/boardname/u-boot.lds) these
+by writing in u-boot.lds ($(srctree)/board/boardname/u-boot.lds) these
 3 lines:
 
-       __u_boot_cmd_start = .;
-       .u_boot_cmd : { *(.u_boot_cmd) }
-       __u_boot_cmd_end = .;
+       .u_boot_list : {
+               KEEP(*(SORT(.u_boot_list*)));
+       }