* [U-Boot] [PATCH] README.commands: Document what UNDEF_SYM does
@ 2012-09-18 23:42 Tom Rini
2012-09-19 21:09 ` Jeroen Hofstee
0 siblings, 1 reply; 3+ messages in thread
From: Tom Rini @ 2012-09-18 23:42 UTC (permalink / raw)
To: u-boot
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
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [U-Boot] [PATCH] README.commands: Document what UNDEF_SYM does
2012-09-18 23:42 [U-Boot] [PATCH] README.commands: Document what UNDEF_SYM does Tom Rini
@ 2012-09-19 21:09 ` Jeroen Hofstee
2012-09-19 21:17 ` Tom Rini
0 siblings, 1 reply; 3+ messages in thread
From: Jeroen Hofstee @ 2012-09-19 21:09 UTC (permalink / raw)
To: u-boot
On 09/19/2012 01:42 AM, Tom Rini wrote:
> +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).
> +
I have no idea what this is about, but my mind has difficulty parsing
this sentence.
"To ensure that the linker does not discard these symbols when linking
full U-Boot we use generate a list"
a generated list?
Regards,
Jeroen
^ permalink raw reply [flat|nested] 3+ messages in thread
* [U-Boot] [PATCH] README.commands: Document what UNDEF_SYM does
2012-09-19 21:09 ` Jeroen Hofstee
@ 2012-09-19 21:17 ` Tom Rini
0 siblings, 0 replies; 3+ messages in thread
From: Tom Rini @ 2012-09-19 21:17 UTC (permalink / raw)
To: u-boot
On Wed, Sep 19, 2012 at 11:09:56PM +0200, Jeroen Hofstee wrote:
> On 09/19/2012 01:42 AM, Tom Rini wrote:
> >+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).
> >+
> I have no idea what this is about, but my mind has difficulty parsing
> this sentence.
>
> "To ensure that the linker does not discard these symbols when linking
> full U-Boot we use generate a list"
>
> a generated list?
Bah, re-wrote the sentance a few times in my head as I was writing it.
... full U-Boot we geneate a list of all the commands we have built
(based on the sections mentioned above) and use that to force the linker
...
--
Tom
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2012-09-18 23:42 [U-Boot] [PATCH] README.commands: Document what UNDEF_SYM does Tom Rini
2012-09-19 21:09 ` Jeroen Hofstee
2012-09-19 21:17 ` Tom Rini
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