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| -rw-r--r-- | doc/README.commands | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/doc/README.commands b/doc/README.commands index 27815d2..125f077 100644 --- a/doc/README.commands +++ b/doc/README.commands @@ -22,6 +22,13 @@ 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. +To ensure that the linker does not discard these symbols when linking +full U-Boot we generate a list of all the commands we have built (based +on the sections mentioned above) and use that to force the linker to +first enter the symbol as undefined in the output object so that there +is then a need for the symbol to be kept (this is the UNDEF_SYM logic in +the Makefile). + 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: |