From 24a1a47562b0fbb97321191dcc3a67b337b20f8f Mon Sep 17 00:00:00 2001 From: =?utf8?q?Andreas=20Bie=C3=9Fmann?= Date: Wed, 13 Apr 2011 10:07:35 +0200 Subject: [PATCH] avr32: add ATAG_BOARDINFO MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Hans-Christian Egtvedt --- arch/avr32/include/asm/setup.h | 9 +++++++++ arch/avr32/kernel/setup.c | 15 +++++++++++++++ 2 files changed, 24 insertions(+) diff --git a/arch/avr32/include/asm/setup.h b/arch/avr32/include/asm/setup.h index ff5b7cf6be4d..160543dbec7e 100644 --- a/arch/avr32/include/asm/setup.h +++ b/arch/avr32/include/asm/setup.h @@ -94,6 +94,13 @@ struct tag_ethernet { #define ETH_INVALID_PHY 0xff +/* board information */ +#define ATAG_BOARDINFO 0x54410008 + +struct tag_boardinfo { + u32 board_number; +}; + struct tag { struct tag_header hdr; union { @@ -102,6 +109,7 @@ struct tag { struct tag_cmdline cmdline; struct tag_clock clock; struct tag_ethernet ethernet; + struct tag_boardinfo boardinfo; } u; }; @@ -128,6 +136,7 @@ extern struct tag *bootloader_tags; extern resource_size_t fbmem_start; extern resource_size_t fbmem_size; +extern u32 board_number; void setup_processor(void); 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 @@ -390,6 +390,21 @@ 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 -- 2.30.2