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Date:	Mon, 2 Nov 2009 23:12:52 +0800
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Subject: Re: Problem in booting when calling calibrate_delay
From:	"wilbur.chan" <wilbur512@gmail.com>
To:	Ralf Baechle <ralf@linux-mips.org>
Cc:	Linux MIPS Mailing List <linux-mips@linux-mips.org>
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2009/11/1 Ralf Baechle <ralf@linux-mips.org>:
> On Thu, Oct 29, 2009 at 07:51:52AM +0800, wilbur.chan wrote:

> When something like this happens it is in most cases caused by timer
> interrupt not working.
>
>  Ralf
>

Today , I found that ,  the code never enter the do_timer function.

As a matter of fact, I'm testing kexec on mips64 smp.   In the end of
the first kernel , I' ve  used local_irq_disable

and jumped directly into second kernel. However it hang at calibrate_delay.

In a normal booting on mips64, I found that , do_timer was invoked
after console_init.

Here is my dump_stack of do_timer, in a successfully booting log:

0:Call Trace:
0:[ <834243cc>]0: dump_stack+0x8/0x34
0:[ <83451ee0>]0: do_timer+0x70/0xa8
0:[ <8342333c>]0: timer_interrupt+0x64/0x160
0:[ <834234b4>]0: ll_timer_interrupt+0x7c/0xd8
0:[ <8341d220>]0: ret_from_irq+0x0/0x4
0:[ <83443a64>]0: release_console_sem+0x1e0/0x328
0:[ <8377cf88>]0: serial8250_console_init+0x1c/0x2c
0:[ <8377ae58>]0: console_init+0x4c/0x6c
0:[ <83762dd8>]0: start_kernel+0x3e0/0x75c


So, I thought that , it might be release_console_sem being failed in
my second kernel of kexec when booting, but I don't know why