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