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bootcount: store bootcount var in environment

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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>
This commit is contained in:
Heiko Schocher 2013-11-04 14:04:59 +01:00 committed by Tom Rini
parent 85b8c5c4bf
commit eda0ba38a8
3 changed files with 46 additions and 0 deletions
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16
README
View file

@ -784,6 +784,22 @@ The following options need to be configured:
as a convenience, when switching between booting from
RAM and NFS.
- Bootcount:
CONFIG_BOOTCOUNT_LIMIT
Implements a mechanism for detecting a repeating reboot
cycle, see:
http://www.denx.de/wiki/view/DULG/UBootBootCountLimit
CONFIG_BOOTCOUNT_ENV
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 used. If "upgrade_available" is
0, "bootcount" is always 0, if "upgrade_available" is
1 "bootcount" is incremented in the environment.
So the Userspace Applikation must set the "upgrade_available"
and "bootcount" variable to 0, if a boot was successfully.
- Pre-Boot Commands:
CONFIG_PREBOOT

1
drivers/bootcount/Makefile
View file

@ -8,3 +8,4 @@ obj-$(CONFIG_BLACKFIN) += bootcount_blackfin.o
obj-$(CONFIG_SOC_DA8XX) += bootcount_davinci.o
obj-$(CONFIG_AM33XX) += bootcount_davinci.o
obj-$(CONFIG_BOOTCOUNT_RAM) += bootcount_ram.o
obj-$(CONFIG_BOOTCOUNT_ENV) += bootcount_env.o

29
drivers/bootcount/bootcount_env.c Normal file
View file

@ -0,0 +1,29 @@
/*
* (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;
}