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On Thu, May 9, 2013 at 10:28 PM, Julius Hemanth P juliushemanth@gmail.com wrote:

This code is small snippet from patch ftp://ftp.linux4sam.org/pub/uboot/u-boot-v2010.06/u-boot-5series_1.0.patch

Linux 2.6.39 (released on www.at91.com/linux4sam) requires serial and revision ATAGs to detect NAND device.

This patch provides backward compatibility for old Linux 2.6.39 by passing serial and revision ATAGs to Linux kernel.

Signed-off-by: Julius Hemanth juliushemanth@gmail.com

Changes for v3: - corrected GPBR register access - updated commit message

Changes for v2: - access GPBR using c structure - removed tailing 1 for #define - s/Miscelaneous/Miscellaneous - s/initialisations/initializations

board/atmel/at91sam9x5ek/at91sam9x5ek.c | 33 ++++++++++++++++++++++++++++++++- include/configs/at91sam9x5ek.h | 5 +++++ 2 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/board/atmel/at91sam9x5ek/at91sam9x5ek.c b/board/atmel/at91sam9x5ek/at91sam9x5ek.c index 8773e6f..116bd83 100644 --- a/board/atmel/at91sam9x5ek/at91sam9x5ek.c +++ b/board/atmel/at91sam9x5ek/at91sam9x5ek.c @@ -27,6 +27,7 @@ #include <asm/arch/at91_common.h> #include <asm/arch/at91_pmc.h> #include <asm/arch/at91_rstc.h> +#include <asm/arch/at91_gpbr.h> #include <asm/arch/gpio.h> #include <asm/arch/clk.h> #include <lcd.h> @@ -48,8 +49,34 @@ DECLARE_GLOBAL_DATA_PTR;

/* ------------------------------------------------------------------------- */ /*

• • Miscelaneous platform dependent initialisations

• • Miscellaneous platform dependent initializations
  */

+#ifdef CONFIG_LOAD_ONE_WIRE_INFO +static u32 system_rev; +static u32 system_serial_low;

+u32 get_board_rev(void) +{

•   return system_rev;
  

+}

+void get_board_serial(struct tag_serialnr *serialnr) +{

•   serialnr->high = 0; /* Not used */
  

•   serialnr->low = system_serial_low;
  

+}

+void load_1wire_info(void) +{

•   at91_gpbr_t *gpbr = (at91_gpbr_t *) ATMEL_BASE_GPBR;
  

•   /* serial is in GPBR #2 and revision is in GPBR #3 */
  

•   system_serial_low = readl(&gpbr->reg[2]);
  

•   system_rev = readl(&gpbr->reg[3]);
  

+} +#endif

#ifdef CONFIG_CMD_NAND static void at91sam9x5ek_nand_hw_init(void) { @@ -282,6 +309,10 @@ int board_init(void) /* adress of boot parameters */ gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100;

+#ifdef CONFIG_LOAD_ONE_WIRE_INFO

•   load_1wire_info();
  

+#endif

#ifdef CONFIG_CMD_NAND at91sam9x5ek_nand_hw_init(); #endif diff --git a/include/configs/at91sam9x5ek.h b/include/configs/at91sam9x5ek.h index ee6e3fc..995e43b 100644 --- a/include/configs/at91sam9x5ek.h +++ b/include/configs/at91sam9x5ek.h @@ -38,6 +38,11 @@ #define CONFIG_CMDLINE_TAG /* enable passing of ATAGs */ #define CONFIG_SETUP_MEMORY_TAGS #define CONFIG_INITRD_TAG

+#define CONFIG_LOAD_ONE_WIRE_INFO +#define CONFIG_REVISION_TAG +#define CONFIG_SERIAL_TAG

#define CONFIG_SKIP_LOWLEVEL_INIT #define CONFIG_BOARD_EARLY_INIT_F

#define CONFIG_DISPLAY_CPUINFO

1.8.2.2