X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;ds=sidebyside;f=doc%2FREADME.commands;h=9eb367104fd9a1bc77ede04bc11c1ead51b602b9;hb=2dd285f571c5880314903a0a19b8b7da0175661c;hp=27815d2ba18faada4344e68ed65ac3b188569797;hpb=00309c67ab8c8a1d4447f643b318b1474926173a;p=u-boot diff --git a/doc/README.commands b/doc/README.commands index 27815d2ba1..9eb367104f 100644 --- 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 3 lines: - __u_boot_cmd_start = .; - .u_boot_cmd : { *(.u_boot_cmd) } - __u_boot_cmd_end = .; + .u_boot_list : { + KEEP(*(SORT(.u_boot_list*))); + }