Garbage characters on serial console (Linus "next")

[Tony Luck]

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>^\ÃÃ^@ÃÃ^\Ã^\<8c>ÃÃÃÃ^\<80><80>ÃÃÃÃ<80>Ã<8e>^@ÃÃ^\ÃÃÃ<80>^@<8e>Ã^@Ã<80><80>^\^\Ã^\^@^\ÃÃÃ^@Ã^\ÃÃ^\<80><80>ÃÃ<80>Ã<80>ÃÃÃÃÃ<8e>^\Ã<80>Ã^@Ã<80>ÃÃÃ^@Ã<8e>Ã<80><80><80><80>ÃÃÃ<80>ÃÃ^\Ã^\^\<80>ÃÃÃ^\ÃÃ<8e>^@^\Ã^\^\^\Ã<8e><80>ÃÃ<8e><80>^\^@^@^\^\<8e><8e>^\ÃÃÃ^\<8e>^@^\<80>^@Ã^\Ã^\Ã<80>^@^\^\Ã^\^\Ã^L^@<8e>Ã^\<80>^\^\Ã^\Ã^\Ã

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

-Tony
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