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README.commands: Document what UNDEF_SYM does

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Changes in v2:
- Reword a bit more

Signed-off-by: Tom Rini <trini@ti.com>
This commit is contained in:
Tom Rini 2012-09-20 06:02:43 +00:00
parent 244e6f9705
commit 2d1d65838e
1 changed files with 7 additions and 0 deletions
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doc/README.commands
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@ -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: