This patch adds a new ATAG_BORADINFO to U-Boot. This tag is intended to hand over the bd->bi_board_number to the linux kernel for early stage board information like a board revision or other kind of board specific decisions necessary before the linux peripherial drivers are up.
Signed-off-by: Andreas Bießmann <biessm...@corscience.de> --- I try to get this information interchange in mainline to have the ATAG key value reserved for that intended use. Please see http://lists.avr32linux.org/pipermail/kernel/2011-April/005593.html and http://article.gmane.org/gmane.linux.kernel/1125654 for more information. arch/avr32/include/asm/setup.h | 8 ++++++++ arch/avr32/lib/bootm.c | 11 +++++++++++ 2 files changed, 19 insertions(+), 0 deletions(-) diff --git a/arch/avr32/include/asm/setup.h b/arch/avr32/include/asm/setup.h index e6ef8d6..7f5d883 100644 --- a/arch/avr32/include/asm/setup.h +++ b/arch/avr32/include/asm/setup.h @@ -107,6 +107,13 @@ struct tag_ethernet { #define AETH_INVALID_PHY 0xff +/* board information information */ +#define ATAG_BOARDINFO 0x54410008 + +struct tag_boardinfo { + u32 board_number; +}; + struct tag { struct tag_header hdr; union { @@ -115,6 +122,7 @@ struct tag { struct tag_cmdline cmdline; struct tag_clock clock; struct tag_ethernet ethernet; + struct tag_boardinfo boardinfo; } u; }; diff --git a/arch/avr32/lib/bootm.c b/arch/avr32/lib/bootm.c index 8a47cfe..c9a55ff 100644 --- a/arch/avr32/lib/bootm.c +++ b/arch/avr32/lib/bootm.c @@ -165,6 +165,16 @@ static struct tag *setup_ethernet_tags(struct tag *params) return params; } +static struct tag *setup_boardinfo_tag(struct tag *params) +{ + params->hdr.tag = ATAG_BOARDINFO; + params->hdr.size = tag_size(tag_boardinfo); + + params->u.boardinfo.board_number = gd->bd->bi_board_number; + + return tag_next(params); +} + static void setup_end_tag(struct tag *params) { params->hdr.tag = ATAG_NONE; @@ -195,6 +205,7 @@ int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *ima params = setup_commandline_tag(params, commandline); params = setup_clock_tags(params); params = setup_ethernet_tags(params); + params = setup_boardinfo_tag(params); setup_end_tag(params); printf("\nStarting kernel at %p (params at %p)...\n\n", -- 1.7.2.5 _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
