[PATCH 1/4] 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
---
common/Kconfig |8
common/Makefile|1 +
common/reset_source.c | 44
include/reset_source.h | 27 +++
4 files changed, 80 insertions(+)
create mode 100644 common/reset_source.c
create mode 100644 include/reset_source.h
diff --git a/common/Kconfig b/common/Kconfig
index 5fe997d..9652e5d 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -554,6 +554,14 @@ 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 "
diff --git a/common/Makefile b/common/Makefile
index d99dfa2..d74dffb 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -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
diff --git a/common/reset_source.c b/common/reset_source.c
new file mode 100644
index 000..2a7f9ff
--- /dev/null
+++ b/common/reset_source.c
@@ -0,0 +1,44 @@
+/*
+ * (C) Copyright 2012 Juergen Beisert -
+ *
+ * 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
+#include
+#include
+#include
+#include
+
+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);
diff --git a/include/reset_source.h b/include/reset_source.h
new file mode 100644
index 000..6734fbde
--- /dev/null
+++ b/include/reset_source.h
@@ -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 */
--
1.7.10.4
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Re: [PATCH 1/4] Enable a way to provide the reason for "being here"
On Fri, Jul 13, 2012 at 08:04:46AM +0200, Juergen Beisert wrote: > 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 > --- > common/Makefile|2 +- > common/reset_source.c | 44 > include/reset_source.h | 27 +++ > 3 files changed, 72 insertions(+), 1 deletion(-) > create mode 100644 common/reset_source.c > create mode 100644 include/reset_source.h > > diff --git a/common/Makefile b/common/Makefile > index d99dfa2..baf4539 100644 > --- a/common/Makefile > +++ b/common/Makefile > @@ -29,7 +29,7 @@ obj-$(CONFIG_UIMAGE) += uimage.o > obj-y += startup.o > obj-y += misc.o > obj-y += memsize.o > -obj-$(CONFIG_GLOBALVAR) += globalvar.o > +obj-$(CONFIG_GLOBALVAR) += globalvar.o reset_source.o This should be a separate config option which depends on GLOBALVAR. > + RESET_WKE, /* wake-up (some SoCs can handle this) */ > + RESET_JTAG, /* JTAG reset */ > +}; > + > +extern void set_reset_source(enum reset_src_type); 'extern' is not needed in function declarations. Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0| Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917- | ___ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox
[PATCH 1/4] Enable a way to provide the reason for "being here"
Many architectures support a way to detect why the bootloader is running.
This patch adds a global variable to be able to use the cause in some kind of
shell code to do special things on demand. For example to do an emergency boot,
when the last boot fails and the watchdog reactivate the hanging system.
Signed-off-by: Juergen Beisert
---
common/Makefile|2 +-
common/reset_source.c | 44
include/reset_source.h | 27 +++
3 files changed, 72 insertions(+), 1 deletion(-)
create mode 100644 common/reset_source.c
create mode 100644 include/reset_source.h
diff --git a/common/Makefile b/common/Makefile
index d99dfa2..baf4539 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -29,7 +29,7 @@ obj-$(CONFIG_UIMAGE) += uimage.o
obj-y += startup.o
obj-y += misc.o
obj-y += memsize.o
-obj-$(CONFIG_GLOBALVAR) += globalvar.o
+obj-$(CONFIG_GLOBALVAR) += globalvar.o reset_source.o
obj-$(CONFIG_FILETYPE) += filetype.o
obj-y += resource.o
obj-$(CONFIG_MENU) += menu.o
diff --git a/common/reset_source.c b/common/reset_source.c
new file mode 100644
index 000..2a7f9ff
--- /dev/null
+++ b/common/reset_source.c
@@ -0,0 +1,44 @@
+/*
+ * (C) Copyright 2012 Juergen Beisert -
+ *
+ * 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
+#include
+#include
+#include
+#include
+
+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);
diff --git a/include/reset_source.h b/include/reset_source.h
new file mode 100644
index 000..8bb366c
--- /dev/null
+++ b/include/reset_source.h
@@ -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 */
+};
+
+extern void set_reset_source(enum reset_src_type);
+
+#endif /* __INCLUDE_RESET_SOURCE_H */
--
1.7.10.4
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[PATCH 1/4] 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
---
common/Makefile|2 +-
common/reset_source.c | 44
include/reset_source.h | 27 +++
3 files changed, 72 insertions(+), 1 deletion(-)
create mode 100644 common/reset_source.c
create mode 100644 include/reset_source.h
diff --git a/common/Makefile b/common/Makefile
index d99dfa2..baf4539 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -29,7 +29,7 @@ obj-$(CONFIG_UIMAGE) += uimage.o
obj-y += startup.o
obj-y += misc.o
obj-y += memsize.o
-obj-$(CONFIG_GLOBALVAR) += globalvar.o
+obj-$(CONFIG_GLOBALVAR) += globalvar.o reset_source.o
obj-$(CONFIG_FILETYPE) += filetype.o
obj-y += resource.o
obj-$(CONFIG_MENU) += menu.o
diff --git a/common/reset_source.c b/common/reset_source.c
new file mode 100644
index 000..2a7f9ff
--- /dev/null
+++ b/common/reset_source.c
@@ -0,0 +1,44 @@
+/*
+ * (C) Copyright 2012 Juergen Beisert -
+ *
+ * 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
+#include
+#include
+#include
+#include
+
+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);
diff --git a/include/reset_source.h b/include/reset_source.h
new file mode 100644
index 000..8bb366c
--- /dev/null
+++ b/include/reset_source.h
@@ -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 */
+};
+
+extern void set_reset_source(enum reset_src_type);
+
+#endif /* __INCLUDE_RESET_SOURCE_H */
--
1.7.10.4
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