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authorYinghai Lu <yhlu.kernel@gmail.com>2008-07-24 17:29:40 -0700
committerIngo Molnar <mingo@elte.hu>2008-07-26 16:18:41 +0200
commit5c05917e7fe313a187ad6ebb94c1c6cf42862a0b (patch)
tree0b8b59cdfb31016873ad8980d3381c1e5e2200d1 /arch/x86/Kconfig.debug
parent0af36739af81f152cc24a0fdfa0754ef657afe3d (diff)
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x86: usb debug port early console, v4
based on work from Eric, and add some timeout so don't dead loop when debug device is not installed v2: fix checkpatch warning v3: move ehci struct def to linux/usrb/ehci_def.h from host/ehci.h also add CONFIG_EARLY_PRINTK_DBGP to disable it by default v4: address comments from Ingo, seperate ehci reg def moving to another patch also add auto detect port that connect to debug device for Nvidia southbridge Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andi Kleen <andi@firstfloor.org> Cc: "Arjan van de Ven" <arjan@infradead.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: "Greg KH" <greg@kroah.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/Kconfig.debug')
-rw-r--r--arch/x86/Kconfig.debug13
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index 092f019e033a..93422d2ecf61 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -43,6 +43,19 @@ config EARLY_PRINTK
with klogd/syslogd or the X server. You should normally N here,
unless you want to debug such a crash.
+config EARLY_PRINTK_DBGP
+ bool "Early printk via EHCI debug port"
+ default n
+ depends on EARLY_PRINTK
+ help
+ Write kernel log output directly into the EHCI debug port.
+
+ This is useful for kernel debugging when your machine crashes very
+ early before the console code is initialized. For normal operation
+ it is not recommended because it looks ugly and doesn't cooperate
+ with klogd/syslogd or the X server. You should normally N here,
+ unless you want to debug such a crash. You need usb debug device.
+
config DEBUG_STACKOVERFLOW
bool "Check for stack overflows"
depends on DEBUG_KERNEL