mirror of
https://github.com/smaeul/u-boot.git
synced 2025-11-04 05:50:17 +00:00
9e50c406c8
add support for bootcounter on an i2c device. And add a README for all bootcounter options. Signed-off-by: Heiko Schocher <hs@denx.de>
45 lines
807 B
C
45 lines
807 B
C
/*
|
|
* (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;
|
|
}
|