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Enable a way to provide the reason for "being here"

Many architectures support a way to detect why the bootloader is running.
This patch adds a global variable to be able to use the cause in some kind of
shell code to do special things on demand. For example to do an emergency boot,
when the last boot fails and the watchdog reactivate the hanging system.

Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Juergen Beisert 2012-07-18 10:46:47 +02:00 committed by Sascha Hauer
parent b78e5fe9f3
commit 1069567830
4 changed files with 80 additions and 0 deletions

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@ -548,6 +548,14 @@ config BAREBOXENV_TARGET
config POLLER
bool "generic polling infrastructure"
config RESET_SOURCE
bool "detect Reset cause"
depends on GLOBALVAR
help
Provide a global variable at runtine which reflects the possible cause
of the reset and why the bootloader is currently running. It can be
useful for any kind of system recovery or repair.
endmenu
menu "Debugging "

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@ -30,6 +30,7 @@ obj-y += startup.o
obj-y += misc.o
obj-y += memsize.o
obj-$(CONFIG_GLOBALVAR) += globalvar.o
obj-$(CONFIG_RESET_SOURCE) += reset_source.o
obj-$(CONFIG_FILETYPE) += filetype.o
obj-y += resource.o
obj-$(CONFIG_MENU) += menu.o

44
common/reset_source.c Normal file
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@ -0,0 +1,44 @@
/*
* (C) Copyright 2012 Juergen Beisert - <kernel@pengutronix.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <common.h>
#include <init.h>
#include <environment.h>
#include <globalvar.h>
#include <reset_source.h>
static const char * const reset_src_names[] = {
[RESET_UKWN] = "unknown",
[RESET_POR] = "POR",
[RESET_RST] = "RST",
[RESET_WDG] = "WDG",
[RESET_WKE] = "WKE",
[RESET_JTAG] = "JTAG",
};
void set_reset_source(enum reset_src_type st)
{
setenv("global.system.reset", reset_src_names[st]);
}
EXPORT_SYMBOL(set_reset_source);
/* ensure this runs after the 'global' device is already registerd */
static int init_reset_source(void)
{
globalvar_add_simple("system.reset");
set_reset_source(RESET_UKWN);
return 0;
}
coredevice_initcall(init_reset_source);

27
include/reset_source.h Normal file
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@ -0,0 +1,27 @@
/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __INCLUDE_RESET_SOURCE_H
# define __INCLUDE_RESET_SOURCE_H
enum reset_src_type {
RESET_UKWN, /* maybe the SoC cannot detect the reset source */
RESET_POR, /* Power On Reset (cold start) */
RESET_RST, /* generic ReSeT (warm start) */
RESET_WDG, /* watchdog */
RESET_WKE, /* wake-up (some SoCs can handle this) */
RESET_JTAG, /* JTAG reset */
};
void set_reset_source(enum reset_src_type);
#endif /* __INCLUDE_RESET_SOURCE_H */