[U-Boot] [PATCH v3] Consolidate bootcount code into drivers/bootcount

[Rob Herring <robherring2@gmail.com>]

On 06/05/2012 01:37 AM, Stefan Roese wrote:
> This patch moves all bootcount implementations into a common
> directory: drivers/bootcount. The generic bootcount driver
> is now usable not only by powerpc platforms, but others as well.
> 
> Signed-off-by: Stefan Roese <sr@denx.de>
> Cc: Heiko Schocher <hs@denx.de>
> Cc: Valentin Longchamp <valentin.longchamp@keymile.com>
> Cc: Christian Riesch <christian.riesch@omicron.at>
> Cc: Manfred Rudigier <manfred.rudigier@omicron.at>
> Cc: Mike Frysinger <vapier@gentoo.org>
> Cc: Rob Herring <rob.herring@calxeda.com>
> Cc: Reinhard Meyer <reinhard.meyer@emk-elektronik.de>
> Tested-by: Valentin Longchamp <valentin.longchamp@keymile.com>
> Tested-by: Christian Riesch <christian.riesch@omicron.at>

For highbank:

Acked-by: Rob Herring <rob.herring@calxeda.com>

> ---
> v3:
> - Moved le-/be-accessors into header so that they now can be
>   used by all bootcount drivers.
> - Changed CONFIG_BOOTCOUNT_LE to CONFIG_SYS_BOOTCOUNT_LE
> - Enabled CONFIG_SYS_BOOTCOUNT_LE in highbank
> - Enabled CONFIG_SYS_BOOTCOUNT_SINGLEWORD in highbank
> 
> v2:
> - Added CONFIG_BOOTCOUNT_LE to bootcount_davinci.c and enabled it
>   in calimain.h to select little-endian accessors.
> 
>  Makefile                                           |    3 +
>  arch/arm/cpu/arm926ejs/at91/cpu.c                  |   26 -------
>  arch/arm/cpu/armv7/highbank/Makefile               |    2 +-
>  arch/arm/cpu/armv7/highbank/bootcount.c            |   36 ----------
>  arch/arm/cpu/ixp/cpu.c                             |   22 ------
>  arch/powerpc/lib/Makefile                          |    1 -
>  board/enbw/enbw_cmc/enbw_cmc.c                     |   29 --------
>  board/keymile/km_arm/km_arm.c                      |   51 --------------
>  board/omicron/calimain/calimain.c                  |   29 --------
>  drivers/bootcount/Makefile                         |   47 +++++++++++++
>  .../powerpc/lib => drivers/bootcount}/bootcount.c  |   25 ++++---
>  drivers/bootcount/bootcount_at91.c                 |   43 ++++++++++++
>  .../bootcount/bootcount_blackfin.c                 |    0
>  drivers/bootcount/bootcount_davinci.c              |   49 +++++++++++++
>  drivers/bootcount/bootcount_ram.c                  |   72 ++++++++++++++++++++
>  include/bootcount.h                                |   42 ++++++++++++
>  include/configs/calimain.h                         |    1 +
>  include/configs/highbank.h                         |    2 +
>  include/configs/km/km_arm.h                        |    2 +
>  19 files changed, 276 insertions(+), 206 deletions(-)
>  delete mode 100644 arch/arm/cpu/armv7/highbank/bootcount.c
>  create mode 100644 drivers/bootcount/Makefile
>  rename {arch/powerpc/lib => drivers/bootcount}/bootcount.c (84%)
>  create mode 100644 drivers/bootcount/bootcount_at91.c
>  rename arch/blackfin/cpu/bootcount.c => drivers/bootcount/bootcount_blackfin.c (100%)
>  create mode 100644 drivers/bootcount/bootcount_davinci.c
>  create mode 100644 drivers/bootcount/bootcount_ram.c
>  create mode 100644 include/bootcount.h
> 
> diff --git a/Makefile b/Makefile
> index 659e8f2..8fd51b8 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -249,6 +249,9 @@ LIBS += net/libnet.o
>  LIBS += disk/libdisk.o
>  LIBS += drivers/bios_emulator/libatibiosemu.o
>  LIBS += drivers/block/libblock.o
> +ifeq ($(CONFIG_BOOTCOUNT_LIMIT),y)
> +LIBS += drivers/bootcount/libbootcount.o
> +endif
>  LIBS += drivers/dma/libdma.o
>  LIBS += drivers/fpga/libfpga.o
>  LIBS += drivers/gpio/libgpio.o
> diff --git a/arch/arm/cpu/arm926ejs/at91/cpu.c b/arch/arm/cpu/arm926ejs/at91/cpu.c
> index c47fb31..5cf4fad 100644
> --- a/arch/arm/cpu/arm926ejs/at91/cpu.c
> +++ b/arch/arm/cpu/arm926ejs/at91/cpu.c
> @@ -71,29 +71,3 @@ int print_cpuinfo(void)
>  	return 0;
>  }
>  #endif
> -
> -#ifdef CONFIG_BOOTCOUNT_LIMIT
> -/*
> - * We combine the BOOTCOUNT_MAGIC and bootcount in one 32-bit register.
> - * This is done so we need to use only one of the four GPBR registers.
> - */
> -void bootcount_store (ulong a)
> -{
> -	at91_gpbr_t *gpbr = (at91_gpbr_t *) ATMEL_BASE_GPBR;
> -
> -	writel((BOOTCOUNT_MAGIC & 0xffff0000) | (a & 0x0000ffff),
> -		&gpbr->reg[AT91_GPBR_INDEX_BOOTCOUNT]);
> -}
> -
> -ulong bootcount_load (void)
> -{
> -	at91_gpbr_t *gpbr = (at91_gpbr_t *) ATMEL_BASE_GPBR;
> -
> -	ulong val = readl(&gpbr->reg[AT91_GPBR_INDEX_BOOTCOUNT]);
> -	if ((val & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
> -		return 0;
> -	else
> -		return val & 0x0000ffff;
> -}
> -
> -#endif /* CONFIG_BOOTCOUNT_LIMIT */
> diff --git a/arch/arm/cpu/armv7/highbank/Makefile b/arch/arm/cpu/armv7/highbank/Makefile
> index 917c3a3..76faeb0 100644
> --- a/arch/arm/cpu/armv7/highbank/Makefile
> +++ b/arch/arm/cpu/armv7/highbank/Makefile
> @@ -25,7 +25,7 @@ include $(TOPDIR)/config.mk
>  
>  LIB	= $(obj)lib$(SOC).o
>  
> -COBJS	:= timer.o bootcount.o
> +COBJS	:= timer.o
>  SOBJS	:=
>  
>  SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
> diff --git a/arch/arm/cpu/armv7/highbank/bootcount.c b/arch/arm/cpu/armv7/highbank/bootcount.c
> deleted file mode 100644
> index 9ca0656..0000000
> --- a/arch/arm/cpu/armv7/highbank/bootcount.c
> +++ /dev/null
> @@ -1,36 +0,0 @@
> -/*
> - * Copyright 2011 Calxeda, Inc.
> - *
> - * This program is free software; you can redistribute it and/or modify it
> - * under the terms of the GNU General Public License as published by the Free
> - * Software Foundation; either version 2 of the License, or (at your option)
> - * any later version.
> - *
> - * This program is distributed in the hope it will be useful, but WITHOUT
> - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> - * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> - * more details.
> - *
> - * You should have received a copy of the GNU General Public License along with
> - * this program.  If not, see <http://www.gnu.org/licenses/>.
> - */
> -
> -#include <common.h>
> -#include <asm/io.h>
> -
> -#ifdef CONFIG_BOOTCOUNT_LIMIT
> -void bootcount_store(ulong a)
> -{
> -	writel((BOOTCOUNT_MAGIC & 0xffff0000) | a, CONFIG_SYS_BOOTCOUNT_ADDR);
> -}
> -
> -ulong bootcount_load(void)
> -{
> -	u32 tmp = readl(CONFIG_SYS_BOOTCOUNT_ADDR);
> -
> -	if ((tmp & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
> -		return 0;
> -	else
> -		return tmp & 0x0000ffff;
> -}
> -#endif
> diff --git a/arch/arm/cpu/ixp/cpu.c b/arch/arm/cpu/ixp/cpu.c
> index 942845d..f1864d6 100644
> --- a/arch/arm/cpu/ixp/cpu.c
> +++ b/arch/arm/cpu/ixp/cpu.c
> @@ -107,28 +107,6 @@ void pci_init(void)
>  }
>  */
>  
> -#ifdef CONFIG_BOOTCOUNT_LIMIT
> -
> -void bootcount_store (ulong a)
> -{
> -	volatile ulong *save_addr = (volatile ulong *)(CONFIG_SYS_BOOTCOUNT_ADDR);
> -
> -	save_addr[0] = a;
> -	save_addr[1] = BOOTCOUNT_MAGIC;
> -}
> -
> -ulong bootcount_load (void)
> -{
> -	volatile ulong *save_addr = (volatile ulong *)(CONFIG_SYS_BOOTCOUNT_ADDR);
> -
> -	if (save_addr[1] != BOOTCOUNT_MAGIC)
> -		return 0;
> -	else
> -		return save_addr[0];
> -}
> -
> -#endif /* CONFIG_BOOTCOUNT_LIMIT */
> -
>  int cpu_eth_init(bd_t *bis)
>  {
>  #ifdef CONFIG_IXP4XX_NPE
> diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile
> index cdd62a2..965f9ea 100644
> --- a/arch/powerpc/lib/Makefile
> +++ b/arch/powerpc/lib/Makefile
> @@ -46,7 +46,6 @@ SOBJS-y	+= reloc.o
>  COBJS-$(CONFIG_BAT_RW) += bat_rw.o
>  COBJS-y	+= board.o
>  COBJS-y	+= bootm.o
> -COBJS-$(CONFIG_BOOTCOUNT_LIMIT) += bootcount.o
>  COBJS-y	+= cache.o
>  COBJS-y	+= extable.o
>  COBJS-y	+= interrupts.o
> diff --git a/board/enbw/enbw_cmc/enbw_cmc.c b/board/enbw/enbw_cmc/enbw_cmc.c
> index 6c0d931..3616df0 100644
> --- a/board/enbw/enbw_cmc/enbw_cmc.c
> +++ b/board/enbw/enbw_cmc/enbw_cmc.c
> @@ -517,35 +517,6 @@ void arch_memory_failure_handle(void)
>  }
>  #endif
>  
> -#if defined(CONFIG_BOOTCOUNT_LIMIT)
> -void bootcount_store(ulong a)
> -{
> -	struct davinci_rtc *reg =
> -		(struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
> -
> -	/*
> -	 * write RTC kick register to enable write
> -	 * for RTC Scratch registers. Scratch0 and 1 are
> -	 * used for bootcount values.
> -	 */
> -	writel(RTC_KICK0R_WE, &reg->kick0r);
> -	writel(RTC_KICK1R_WE, &reg->kick1r);
> -	out_be32(&reg->scratch0, a);
> -	out_be32(&reg->scratch1, BOOTCOUNT_MAGIC);
> -}
> -
> -ulong bootcount_load(void)
> -{
> -	struct davinci_rtc *reg =
> -		(struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
> -
> -	if (in_be32(&reg->scratch1) != BOOTCOUNT_MAGIC)
> -		return 0;
> -	else
> -		return in_be32(&reg->scratch0);
> -}
> -#endif
> -
>  void board_gpio_init(void)
>  {
>  	struct davinci_gpio *gpio = davinci_gpio_bank01;
> diff --git a/board/keymile/km_arm/km_arm.c b/board/keymile/km_arm/km_arm.c
> index 9e9940c..667edbc 100644
> --- a/board/keymile/km_arm/km_arm.c
> +++ b/board/keymile/km_arm/km_arm.c
> @@ -404,57 +404,6 @@ int hush_init_var(void)
>  }
>  #endif
>  
> -#if defined(CONFIG_BOOTCOUNT_LIMIT)
> -const ulong patterns[]      = {	0x00000000,
> -				0xFFFFFFFF,
> -				0xFF00FF00,
> -				0x0F0F0F0F,
> -				0xF0F0F0F0};
> -const ulong NBR_OF_PATTERNS = sizeof(patterns)/sizeof(*patterns);
> -const ulong OFFS_PATTERN    = 3;
> -const ulong REPEAT_PATTERN  = 1000;
> -
> -void bootcount_store(ulong a)
> -{
> -	ulong *save_addr;
> -	ulong size = 0;
> -	int i;
> -
> -	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++)
> -		size += gd->bd->bi_dram[i].size;
> -	save_addr = (ulong *)(size - BOOTCOUNT_ADDR);
> -	writel(a, save_addr);
> -	writel(BOOTCOUNT_MAGIC, &save_addr[1]);
> -
> -	for (i = 0; i < REPEAT_PATTERN; i++)
> -		writel(patterns[i % NBR_OF_PATTERNS],
> -			&save_addr[i+OFFS_PATTERN]);
> -
> -}
> -
> -ulong bootcount_load(void)
> -{
> -	ulong *save_addr;
> -	ulong size = 0;
> -	ulong counter = 0;
> -	int i, tmp;
> -
> -	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++)
> -		size += gd->bd->bi_dram[i].size;
> -	save_addr = (ulong *)(size - BOOTCOUNT_ADDR);
> -
> -	counter = readl(&save_addr[0]);
> -
> -	/* Is the counter reliable, check in the big pattern for bit errors */
> -	for (i = 0; (i < REPEAT_PATTERN) && (counter != 0); i++) {
> -		tmp = readl(&save_addr[i+OFFS_PATTERN]);
> -		if (tmp != patterns[i % NBR_OF_PATTERNS])
> -			counter = 0;
> -	}
> -	return counter;
> -}
> -#endif
> -
>  #if defined(CONFIG_SOFT_I2C)
>  void set_sda(int state)
>  {
> diff --git a/board/omicron/calimain/calimain.c b/board/omicron/calimain/calimain.c
> index 54415ce..1060a1f 100644
> --- a/board/omicron/calimain/calimain.c
> +++ b/board/omicron/calimain/calimain.c
> @@ -157,32 +157,3 @@ void hw_watchdog_reset(void)
>  	davinci_hw_watchdog_reset();
>  }
>  #endif
> -
> -#if defined(CONFIG_BOOTCOUNT_LIMIT)
> -void bootcount_store(ulong a)
> -{
> -	struct davinci_rtc *reg =
> -		(struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
> -
> -	/*
> -	 * write RTC kick register to enable write
> -	 * for RTC Scratch registers. Scratch0 and 1 are
> -	 * used for bootcount values.
> -	 */
> -	writel(RTC_KICK0R_WE, &reg->kick0r);
> -	writel(RTC_KICK1R_WE, &reg->kick1r);
> -	writel(a, &reg->scratch0);
> -	writel(BOOTCOUNT_MAGIC, &reg->scratch1);
> -}
> -
> -ulong bootcount_load(void)
> -{
> -	struct davinci_rtc *reg =
> -		(struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
> -
> -	if (readl(&reg->scratch1) != BOOTCOUNT_MAGIC)
> -		return 0;
> -	else
> -		return readl(&reg->scratch0);
> -}
> -#endif
> diff --git a/drivers/bootcount/Makefile b/drivers/bootcount/Makefile
> new file mode 100644
> index 0000000..3d5ec13
> --- /dev/null
> +++ b/drivers/bootcount/Makefile
> @@ -0,0 +1,47 @@
> +#
> +# See file CREDITS for list of people who contributed to this
> +# project.
> +#
> +# This program is free software; you can redistribute it and/or
> +# modify it under the terms of the GNU General Public License as
> +# published by the Free Software Foundation; either version 2 of
> +# the License, or (at your option) any later version.
> +#
> +# This program is distributed in the hope that it will be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
> +# GNU General Public License for more details.
> +#
> +# You should have received a copy of the GNU General Public License
> +# along with this program; if not, write to the Free Software
> +# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
> +# MA 02111-1307 USA
> +#
> +
> +include $(TOPDIR)/config.mk
> +
> +LIB 	:= $(obj)libbootcount.o
> +
> +COBJS-y				+= bootcount.o
> +COBJS-$(CONFIG_AT91SAM9XE)	+= bootcount_at91.o
> +COBJS-$(CONFIG_BFIN_CPU)	+= bootcount_blackfin.o
> +COBJS-$(CONFIG_SOC_DA8XX)	+= bootcount_davinci.o
> +COBJS-$(CONFIG_BOOTCOUNT_RAM)	+= bootcount_ram.o
> +
> +COBJS	:= $(COBJS-y)
> +SRCS 	:= $(COBJS:.o=.c)
> +OBJS 	:= $(addprefix $(obj),$(COBJS))
> +
> +all:	$(LIB)
> +
> +$(LIB):	$(obj).depend $(OBJS)
> +	$(call cmd_link_o_target, $(OBJS))
> +
> +#########################################################################
> +
> +# defines $(obj).depend target
> +include $(SRCTREE)/rules.mk
> +
> +sinclude $(obj).depend
> +
> +########################################################################
> diff --git a/arch/powerpc/lib/bootcount.c b/drivers/bootcount/bootcount.c
> similarity index 84%
> rename from arch/powerpc/lib/bootcount.c
> rename to drivers/bootcount/bootcount.c
> index f9ce539..a470b62 100644
> --- a/arch/powerpc/lib/bootcount.c
> +++ b/drivers/bootcount/bootcount.c
> @@ -1,5 +1,5 @@
>  /*
> - * (C) Copyright 2010
> + * (C) Copyright 2010-2012
>   * Stefan Roese, DENX Software Engineering, sr at denx.de.
>   *
>   * See file CREDITS for list of people who contributed to this
> @@ -21,8 +21,8 @@
>   * MA 02111-1307 USA
>   */
>  
> -#include <common.h>
> -#include <asm/io.h>
> +#include <bootcount.h>
> +#include <linux/compiler.h>
>  
>  /*
>   * Only override CONFIG_SYS_BOOTCOUNT_ADDR if not already defined. This
> @@ -65,33 +65,36 @@
>  
>  #endif /* !defined(CONFIG_SYS_BOOTCOUNT_ADDR) */
>  
> -void bootcount_store(ulong a)
> +/* Now implement the generic default functions */
> +#if defined(CONFIG_SYS_BOOTCOUNT_ADDR)
> +__weak void bootcount_store(ulong a)
>  {
>  	void *reg = (void *)CONFIG_SYS_BOOTCOUNT_ADDR;
>  
>  #if defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD)
> -	out_be32(reg, (BOOTCOUNT_MAGIC & 0xffff0000) | a);
> +	bc_out32(reg, (BOOTCOUNT_MAGIC & 0xffff0000) | a);
>  #else
> -	out_be32(reg, a);
> -	out_be32(reg + 4, BOOTCOUNT_MAGIC);
> +	bc_out32(reg, a);
> +	bc_out32(reg + 4, BOOTCOUNT_MAGIC);
>  #endif
>  }
>  
> -ulong bootcount_load(void)
> +__weak ulong bootcount_load(void)
>  {
>  	void *reg = (void *)CONFIG_SYS_BOOTCOUNT_ADDR;
>  
>  #if defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD)
> -	u32 tmp = in_be32(reg);
> +	u32 tmp = bc_in32(reg);
>  
>  	if ((tmp & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
>  		return 0;
>  	else
>  		return (tmp & 0x0000ffff);
>  #else
> -	if (in_be32(reg + 4) != BOOTCOUNT_MAGIC)
> +	if (bc_in32(reg + 4) != BOOTCOUNT_MAGIC)
>  		return 0;
>  	else
> -		return in_be32(reg);
> +		return bc_in32(reg);
>  #endif
>  }
> +#endif
> diff --git a/drivers/bootcount/bootcount_at91.c b/drivers/bootcount/bootcount_at91.c
> new file mode 100644
> index 0000000..7cfe14d
> --- /dev/null
> +++ b/drivers/bootcount/bootcount_at91.c
> @@ -0,0 +1,43 @@
> +/*
> + * See file CREDITS for list of people who contributed to this
> + * project.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of
> + * the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + */
> +
> +#include <common.h>
> +#include <asm/io.h>
> +#include <asm/arch/hardware.h>
> +#include <asm/arch/at91_gpbr.h>
> +
> +/*
> + * We combine the BOOTCOUNT_MAGIC and bootcount in one 32-bit register.
> + * This is done so we need to use only one of the four GPBR registers.
> + */
> +void bootcount_store(ulong a)
> +{
> +	at91_gpbr_t *gpbr = (at91_gpbr_t *) ATMEL_BASE_GPBR;
> +
> +	writel((BOOTCOUNT_MAGIC & 0xffff0000) | (a & 0x0000ffff),
> +		&gpbr->reg[AT91_GPBR_INDEX_BOOTCOUNT]);
> +}
> +
> +ulong bootcount_load(void)
> +{
> +	at91_gpbr_t *gpbr = (at91_gpbr_t *) ATMEL_BASE_GPBR;
> +
> +	ulong val = readl(&gpbr->reg[AT91_GPBR_INDEX_BOOTCOUNT]);
> +	if ((val & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
> +		return 0;
> +	else
> +		return val & 0x0000ffff;
> +}
> diff --git a/arch/blackfin/cpu/bootcount.c b/drivers/bootcount/bootcount_blackfin.c
> similarity index 100%
> rename from arch/blackfin/cpu/bootcount.c
> rename to drivers/bootcount/bootcount_blackfin.c
> diff --git a/drivers/bootcount/bootcount_davinci.c b/drivers/bootcount/bootcount_davinci.c
> new file mode 100644
> index 0000000..f560d72
> --- /dev/null
> +++ b/drivers/bootcount/bootcount_davinci.c
> @@ -0,0 +1,49 @@
> +/*
> + * (C) Copyright 2011
> + * Heiko Schocher, DENX Software Engineering, hs at denx.de.
> + *
> + * See file CREDITS for list of people who contributed to this
> + * project.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of
> + * the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + */
> +
> +#include <bootcount.h>
> +#include <asm/arch/da850_lowlevel.h>
> +#include <asm/arch/davinci_misc.h>
> +
> +void bootcount_store(ulong a)
> +{
> +	struct davinci_rtc *reg =
> +		(struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
> +
> +	/*
> +	 * write RTC kick register to enable write
> +	 * for RTC Scratch registers. Scratch0 and 1 are
> +	 * used for bootcount values.
> +	 */
> +	writel(RTC_KICK0R_WE, &reg->kick0r);
> +	writel(RTC_KICK1R_WE, &reg->kick1r);
> +	bc_out32(&reg->scratch0, a);
> +	bc_out32(&reg->scratch1, BOOTCOUNT_MAGIC);
> +}
> +
> +ulong bootcount_load(void)
> +{
> +	struct davinci_rtc *reg =
> +		(struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
> +
> +	if (bc_in32(&reg->scratch1) != BOOTCOUNT_MAGIC)
> +		return 0;
> +	else
> +		return bc_in32(&reg->scratch0);
> +}
> diff --git a/drivers/bootcount/bootcount_ram.c b/drivers/bootcount/bootcount_ram.c
> new file mode 100644
> index 0000000..8655af7
> --- /dev/null
> +++ b/drivers/bootcount/bootcount_ram.c
> @@ -0,0 +1,72 @@
> +/*
> + * (C) Copyright 2010
> + * Heiko Schocher, DENX Software Engineering, hs at denx.de.
> + *
> + * See file CREDITS for list of people who contributed to this
> + * project.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of
> + * the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
> + * GNU General Public License for more details.
> + *
> + */
> +
> +#include <common.h>
> +#include <asm/io.h>
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +const ulong patterns[]      = {	0x00000000,
> +				0xFFFFFFFF,
> +				0xFF00FF00,
> +				0x0F0F0F0F,
> +				0xF0F0F0F0};
> +const ulong NBR_OF_PATTERNS = sizeof(patterns) / sizeof(*patterns);
> +const ulong OFFS_PATTERN    = 3;
> +const ulong REPEAT_PATTERN  = 1000;
> +
> +void bootcount_store(ulong a)
> +{
> +	ulong *save_addr;
> +	ulong size = 0;
> +	int i;
> +
> +	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++)
> +		size += gd->bd->bi_dram[i].size;
> +	save_addr = (ulong *)(size - BOOTCOUNT_ADDR);
> +	writel(a, save_addr);
> +	writel(BOOTCOUNT_MAGIC, &save_addr[1]);
> +
> +	for (i = 0; i < REPEAT_PATTERN; i++)
> +		writel(patterns[i % NBR_OF_PATTERNS],
> +			&save_addr[i + OFFS_PATTERN]);
> +
> +}
> +
> +ulong bootcount_load(void)
> +{
> +	ulong *save_addr;
> +	ulong size = 0;
> +	ulong counter = 0;
> +	int i, tmp;
> +
> +	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++)
> +		size += gd->bd->bi_dram[i].size;
> +	save_addr = (ulong *)(size - BOOTCOUNT_ADDR);
> +
> +	counter = readl(&save_addr[0]);
> +
> +	/* Is the counter reliable, check in the big pattern for bit errors */
> +	for (i = 0; (i < REPEAT_PATTERN) && (counter != 0); i++) {
> +		tmp = readl(&save_addr[i + OFFS_PATTERN]);
> +		if (tmp != patterns[i % NBR_OF_PATTERNS])
> +			counter = 0;
> +	}
> +	return counter;
> +}
> diff --git a/include/bootcount.h b/include/bootcount.h
> new file mode 100644
> index 0000000..1e60959
> --- /dev/null
> +++ b/include/bootcount.h
> @@ -0,0 +1,42 @@
> +/*
> + * (C) Copyright 2012
> + * Stefan Roese, DENX Software Engineering, sr at denx.de.
> + *
> + * See file CREDITS for list of people who contributed to this
> + * project.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of
> + * the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <common.h>
> +#include <asm/io.h>
> +
> +#ifdef CONFIG_SYS_BOOTCOUNT_LE
> +static inline void bc_out32(volatile u32 *addr, u32 data)
> +{
> +	out_le32(addr, data);
> +}
> +
> +static inline u32 bc_in32(volatile u32 *addr)
> +{
> +	return in_le32(addr);
> +}
> +#else
> +static inline void bc_out32(volatile u32 *addr, u32 data)
> +{
> +	out_be32(addr, data);
> +}
> +
> +static inline u32 bc_in32(volatile u32 *addr)
> +{
> +	return in_be32(addr);
> +}
> +#endif
> diff --git a/include/configs/calimain.h b/include/configs/calimain.h
> index 6b68f10..c89f276 100644
> --- a/include/configs/calimain.h
> +++ b/include/configs/calimain.h
> @@ -354,6 +354,7 @@
>  #define CONFIG_SYS_INIT_SP_ADDR		(0x8001ff00)
>  
>  #define CONFIG_BOOTCOUNT_LIMIT
> +#define CONFIG_SYS_BOOTCOUNT_LE		/* Use little-endian accessors */
>  #define CONFIG_SYS_BOOTCOUNT_ADDR	DAVINCI_RTC_BASE
>  
>  #ifndef __ASSEMBLY__
> diff --git a/include/configs/highbank.h b/include/configs/highbank.h
> index 520fa4c..a76cfc3 100644
> --- a/include/configs/highbank.h
> +++ b/include/configs/highbank.h
> @@ -42,6 +42,8 @@
>  #define CONFIG_SYS_BAUDRATE_TABLE	{ 9600, 19200, 38400, 57600, 115200 }
>  
>  #define CONFIG_BOOTCOUNT_LIMIT
> +#define CONFIG_SYS_BOOTCOUNT_SINGLEWORD
> +#define CONFIG_SYS_BOOTCOUNT_LE		/* Use little-endian accessors */
>  #define CONFIG_SYS_BOOTCOUNT_ADDR	0xfff3cf0c
>  
>  #define CONFIG_MISC_INIT_R
> diff --git a/include/configs/km/km_arm.h b/include/configs/km/km_arm.h
> index c73a10c..229745a 100644
> --- a/include/configs/km/km_arm.h
> +++ b/include/configs/km/km_arm.h
> @@ -274,6 +274,8 @@ int get_scl(void);
>  #define CONFIG_KM_RESERVED_PRAM 0x801000
>  /* address for the bootcount (taken from end of RAM) */
>  #define BOOTCOUNT_ADDR          (CONFIG_KM_RESERVED_PRAM)
> +/* Use generic bootcount RAM driver */
> +#define CONFIG_BOOTCOUNT_RAM
>  
>  /* enable POST tests */
>  #define CONFIG_POST	(CONFIG_SYS_POST_MEM_REGIONS)