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authorAndreas Bießmann <biessmann@corscience.de>2011-04-13 10:07:35 +0200
committerHans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>2011-04-13 15:46:59 +0200
commit24a1a47562b0fbb97321191dcc3a67b337b20f8f (patch)
tree4ca976a647a18658f0f80d9ec5c2856b958d395e /arch/avr32/kernel
parentc7d876321f4cf252bc70c1995bbc077a65b3af2a (diff)
downloadlinux-24a1a47562b0fbb97321191dcc3a67b337b20f8f.tar.bz2
avr32: add ATAG_BOARDINFO
The ATAG_BOARDINFO is intended to hand over the information bd->bi_board_number from u-boot to the kernel. This piece of information can be used to implement some kind of board identification while booting the kernel. Therefore it is placed in .initdata section and can be accessed via the new symbol board_number only while initializing the kernel. Signed-off-by: Andreas Bießmann <biessmann@corscience.de> Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
Diffstat (limited to 'arch/avr32/kernel')
-rw-r--r--arch/avr32/kernel/setup.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/avr32/kernel/setup.c b/arch/avr32/kernel/setup.c
index 5c7083916c33..bb0974cce4ac 100644
--- a/arch/avr32/kernel/setup.c
+++ b/arch/avr32/kernel/setup.c
@@ -391,6 +391,21 @@ static int __init parse_tag_clock(struct tag *tag)
__tagtable(ATAG_CLOCK, parse_tag_clock);
/*
+ * The board_number correspond to the bd->bi_board_number in U-Boot. This
+ * parameter is only available during initialisation and can be used in some
+ * kind of board identification.
+ */
+u32 __initdata board_number;
+
+static int __init parse_tag_boardinfo(struct tag *tag)
+{
+ board_number = tag->u.boardinfo.board_number;
+
+ return 0;
+}
+__tagtable(ATAG_BOARDINFO, parse_tag_boardinfo);
+
+/*
* Scan the tag table for this tag, and call its parse function. The
* tag table is built by the linker from all the __tagtable
* declarations.