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From: Tom Rini <trini@ti.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH] README.commands: Document what UNDEF_SYM does
Date: Tue, 18 Sep 2012 16:42:52 -0700	[thread overview]
Message-ID: <1348011772-8533-1-git-send-email-trini@ti.com> (raw)

Signed-off-by: Tom Rini <trini@ti.com>
---
 doc/README.commands |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/doc/README.commands b/doc/README.commands
index 27815d2..21abfb6 100644
--- a/doc/README.commands
+++ b/doc/README.commands
@@ -22,6 +22,12 @@ 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 use generate a list of all of the commands and force the
+linker to first enter the symbol as undefined in the object so that
+there is then a need for the symbol to be kept (UNDEF_SYM 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:
-- 
1.7.9.5

             reply	other threads:[~2012-09-18 23:42 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-09-18 23:42 Tom Rini [this message]
2012-09-19 21:09 ` [U-Boot] [PATCH] README.commands: Document what UNDEF_SYM does Jeroen Hofstee
2012-09-19 21:17   ` Tom Rini

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