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i2c, bootcount: add support for bootcounter on i2c devices

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add support for bootcounter on an i2c device. And add a
README for all bootcounter options.

Signed-off-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Heiko Schocher 2014-01-25 07:27:13 +01:00
parent 16c550274c
commit 9e50c406c8
3 changed files with 65 additions and 0 deletions
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20
README
View file

@ -2855,6 +2855,26 @@ 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

1
drivers/bootcount/Makefile
View file

@ -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

44
drivers/bootcount/bootcount_i2c.c Normal file
View file

@ -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;
}