diff options
| author | Heiko Schocher <hs@denx.de> | 2013-11-04 14:04:59 +0100 |
|---|---|---|
| committer | Tom Rini <trini@ti.com> | 2013-11-11 12:16:28 -0500 |
| commit | eda0ba38a8dfd2572089bd229a027d497c340158 (patch) | |
| tree | acb728760f98bd58b15a0d8d6b36b296ae1fbfe3 | |
| parent | 85b8c5c4bf80025de4632ae6c9a8a606e51508a4 (diff) | |
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>
| -rw-r--r-- | README | 16 | ||||
| -rw-r--r-- | drivers/bootcount/Makefile | 1 | ||||
| -rw-r--r-- | drivers/bootcount/bootcount_env.c | 29 |
3 files changed, 46 insertions, 0 deletions
@@ -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 diff --git a/drivers/bootcount/Makefile b/drivers/bootcount/Makefile index 8256ed0f46..d9c5695853 100644 --- a/drivers/bootcount/Makefile +++ b/drivers/bootcount/Makefile @@ -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 diff --git a/drivers/bootcount/bootcount_env.c b/drivers/bootcount/bootcount_env.c new file mode 100644 index 0000000000..2d6e8db126 --- /dev/null +++ b/drivers/bootcount/bootcount_env.c @@ -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; +} |