u-boot/drivers/bootcount/bootcount_env.c
Heiko Schocher eda0ba38a8 bootcount: store bootcount var in environment
If no softreset save registers are found on the hardware
"bootcount" is stored in the environment. To prevent a
saveenv on all reboots, the environment variable
"upgrade_available" is introduced. If "upgrade_available" is
0, "bootcount" is always 0 therefore no need to save the
environment on u-boot boot, if "upgrade_available" is 1 "bootcount"
is incremented in the environment and environment gets written
on u-boot start.
So the Userspace Applikation must set the "upgrade_available"
and "bootcount" variable to 0 (for example with fw_setenv),
if a boot was successfully.

Signed-off-by: Heiko Schocher <hs@denx.de>
2013-11-11 12:16:28 -05:00

30 lines
521 B
C

/*
* (C) Copyright 2013
* Heiko Schocher, DENX Software Engineering, hs@denx.de.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
void bootcount_store(ulong a)
{
int upgrade_available = getenv_ulong("upgrade_available", 10, 0);
if (upgrade_available) {
setenv_ulong("bootcount", a);
saveenv();
}
}
ulong bootcount_load(void)
{
int upgrade_available = getenv_ulong("upgrade_available", 10, 0);
ulong val = 0;
if (upgrade_available)
val = getenv_ulong("bootcount", 10, 0);
return val;
}