add support for bootcounter on an i2c device. And add a README for all bootcounter options.
Signed-off-by: Heiko Schocher hs@denx.de --- README | 20 ++++++++++++++++++ drivers/bootcount/Makefile | 1 + drivers/bootcount/bootcount_i2c.c | 44 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 65 insertions(+) create mode 100644 drivers/bootcount/bootcount_i2c.c
diff --git a/README b/README index aea82be..bb0751e 100644 --- a/README +++ b/README @@ -2837,6 +2837,26 @@ CBFS (Coreboot Filesystem) support The signing part is build into mkimage regardless of this option.
+- bootcount support: + CONFIG_BOOTCOUNT_LIMIT + + This enables the bootcounter support, see: + http://www.denx.de/wiki/DULG/UBootBootCountLimit + + CONFIG_AT91SAM9XE + enable special bootcounter support on at91sam9xe based boards. + CONFIG_BLACKFIN + enable special bootcounter support on blackfin based boards. + CONFIG_SOC_DA8XX + enable special bootcounter support on da850 based boards. + CONFIG_BOOTCOUNT_RAM + enable support for the bootcounter in RAM + CONFIG_BOOTCOUNT_I2C + enable support for the bootcounter on an i2c (like RTC) device. + CONFIG_SYS_I2C_RTC_ADDR = i2c chip address + CONFIG_SYS_BOOTCOUNT_ADDR = i2c addr which is used for + the bootcounter. + CONFIG_BOOTCOUNT_ALEN = address len
- Show boot progress: CONFIG_SHOW_BOOT_PROGRESS diff --git a/drivers/bootcount/Makefile b/drivers/bootcount/Makefile index bed6971..6f1c419 100644 --- a/drivers/bootcount/Makefile +++ b/drivers/bootcount/Makefile @@ -9,3 +9,4 @@ obj-$(CONFIG_SOC_DA8XX) += bootcount_davinci.o obj-$(CONFIG_BOOTCOUNT_AM33XX) += bootcount_davinci.o obj-$(CONFIG_BOOTCOUNT_RAM) += bootcount_ram.o obj-$(CONFIG_BOOTCOUNT_ENV) += bootcount_env.o +obj-$(CONFIG_BOOTCOUNT_I2C) += bootcount_i2c.o diff --git a/drivers/bootcount/bootcount_i2c.c b/drivers/bootcount/bootcount_i2c.c new file mode 100644 index 0000000..e27b168 --- /dev/null +++ b/drivers/bootcount/bootcount_i2c.c @@ -0,0 +1,44 @@ +/* + * (C) Copyright 2013 + * Heiko Schocher, DENX Software Engineering, hs@denx.de. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <bootcount.h> +#include <linux/compiler.h> +#include <i2c.h> + +#define BC_MAGIC 0xbc + +void bootcount_store(ulong a) +{ + unsigned char buf[3]; + int ret; + + buf[0] = BC_MAGIC; + buf[1] = (a & 0xff); + ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, CONFIG_SYS_BOOTCOUNT_ADDR, + CONFIG_BOOTCOUNT_ALEN, buf, 2); + if (ret != 0) + puts("Error writing bootcount\n"); +} + +ulong bootcount_load(void) +{ + unsigned char buf[3]; + int ret; + + ret = i2c_read(CONFIG_SYS_I2C_RTC_ADDR, CONFIG_SYS_BOOTCOUNT_ADDR, + CONFIG_BOOTCOUNT_ALEN, buf, 2); + if (ret != 0) { + puts("Error loading bootcount\n"); + return 0; + } + if (buf[0] == BC_MAGIC) + return buf[1]; + + bootcount_store(0); + + return 0; +}