linux-kernel - Garbage characters on serial console (Linus "next")

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Date:	Fri, 6 Jun 2014 15:07:54 -0700
From:	Tony Luck <tony.luck@...il.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Garbage characters on serial console (Linus "next")

Pulled from Linus' "next" branch (HEAD =
2b03adc1911d1c84cb7fad8b424234f589547cb3)
and built & booted on ia64.  I see a lot of random characters on the
serial console. Suspiciously starting right after reporting the serial
line has been found.

Here's what the output looks like when I "vi" the saved file:

io scheduler noop registered^M
io scheduler deadline registered^M
io scheduler cfq registered (default)^M
pci_hotplug: PCI Hot Plug PCI Core version: 0.5^M
Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled^M
00:02: ttyS0 at I/O 0x3f8 (irq = 44, base_baud = 115200) is a 16550A^M
<80>^\þÇ^@üþ^\à^\<8c>àüðð^\<80><80>üðøþ<80>à<8e>^@üà^\àðÀ<80>^@<8e>à^@à<80><80>^\^\ÿ^\^@^\þþà^@à^\ðð^\<80><80>üþ<80>ü<80>þðøüà<8e>^\à<80>ð^@ÿ<80>üðà^@à<8e>ð<80><80><80><80>þðþ<80>üþ^\à^\^\<80>þÇü^\øà<8e>^@^\à^\^\^\ð<8e><80>ðà<8e><80>^\^@^@^\^\<8e><8e>^\àþþ^\<8e>^@^\<80>^@þ^\ÿ^\à<80>^@^\^\ø^\^\à^L^@<8e>ð^\<80>^\^\ü^\ø^\ÿ

Output continues with alternating blocks of legible text and garbage.
System eventually boots (with a legible "login:" prompt).

-Tony
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