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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 /Documentation
parent0af36739af81f152cc24a0fdfa0754ef657afe3d (diff)
downloadop-kernel-dev-5c05917e7fe313a187ad6ebb94c1c6cf42862a0b.zip
op-kernel-dev-5c05917e7fe313a187ad6ebb94c1c6cf42862a0b.tar.gz
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 'Documentation')
-rw-r--r--Documentation/kernel-parameters.txt3
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index e7bea3e..92ddd4a 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -657,11 +657,12 @@ and is between 256 and 4096 characters. It is defined in the file
earlyprintk= [X86-32,X86-64,SH,BLACKFIN]
earlyprintk=vga
earlyprintk=serial[,ttySn[,baudrate]]
+ earlyprintk=dbgp
Append ",keep" to not disable it when the real console
takes over.
- Only vga or serial at a time, not both.
+ Only vga or serial or usb debug port at a time.
Currently only ttyS0 and ttyS1 are supported.
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