Hi, Dan,
Attached is the patch to make serial port re-work on VTI on
Tiger4 box, which actually has a 16550 port. Keir's clean simply removed
some hardcode parameter used by IA64, so serial doesn't work then.
Attached patch makes boot parameter 'really' working, and then removed
unnecessary bad hardcode. Now user can use "com2=57600,8n1 console=com2"
to steer xen.
Signed-off-by Kevin Tian <Kevin.tian@xxxxxxxxx>
The patch is made upon latest xeno-unstable tree, and please
check in after you sync with it. It should also benefit ski or zx
machine, though another serial object (uart_driver) still required to be
defined as Keir suggested.
BTW, a special note should be cared by normal users (maybe
should go into README. :-)
If user want to include multiple consoles into
elili.conf, "console=com*" must be the last one. E.g.
"console=ttyS0,57600 console=tty console=com2" is legible. That example
is possible because nowadays Elilo only supports one cmdline, which
means we have to merge boot parameters for xen and for guest kernel into
one line. Then the problem occurs due to different style to define
multiple consoles. Linux kernel support by "console= console= ...",
while xen use "console=vga,com2" style. So the last one is the one that
xen will really use, or else people may see no output from serial port
though already add string there.
Later this problem will be solved when we begin to patch elilo,
for supporting multiple modules load. But people have to be aware of
this caution. :)
Thanks,
Kevin
>-----Original Message-----
>From: xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx
>[mailto:xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
>Magenheimer, Dan (HP Labs Fort Collins)
>Sent: Tuesday, May 31, 2005 2:25 AM
>To: Greg Edwards; xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>Subject: [Xen-ia64-devel] FW: IA-64 serial driver
>
>FYI. I'll take a look at this tomorrow as xeno-unstable
>will undoubtedly be broken for ia64.
>
>Greg, I hope this doesn't throw a wrench into your work.
>(Hopefully it will make it easier.)
>
>> -----Original Message-----
>> From: Keir Fraser [mailto:Keir.Fraser@xxxxxxxxxxxx]
>> Sent: Saturday, May 28, 2005 3:19 PM
>> To: Magenheimer, Dan (HP Labs Fort Collins)
>> Cc: Keir Fraser; Arun Sharma
>> Subject: IA-64 serial driver
>>
>> Dan, Arun,
>>
>> I've just checked in a big cleanup of the serial driver which has
>> certainly broken IA-64 serial output in cases where you do not use a
>> 16550 uart (e.g., your simulator package).
>>
>> I've separated out the guts of 16550 driver code from the generic
>> 'serial framework'. Each architecture calls a set of initialisation
>> functions for the specific uarts that it supports, before calling the
>> generic serial_init_preirq() function.
>>
>> So far I have added ns16550_init() to arch/ia64, but you will need to
>> add a new uart_driver type for each other type of 'serial device' you
>> have. The driver can be *really* simple: just supporting putc, for
>> example.
>>
>> To define a simple driver:
>> static void hp_skiing_putc(struct serial_port *port, char c) { ... }
>> static struct uart_driver hp_skiing = { .putc = hp_skiing_putc };
>>
>> Then, at the same point we do ns16550_init() in arch/ia64/xensetup.c:
>> serial_register_uart(0, &hp_skiing, NULL);
>>
>> -- Keir
>>
>>
>
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patch_serial_ia64
Description: patch_serial_ia64
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