From: Todd Poynor <tpoynor@mvista.com>
To: Prakash kanthi <pkanthi@yahoo.com>
Cc: linuxppc-embedded@lists.linuxppc.org
Subject: Re: rs_timer
Date: Wed, 19 Feb 2003 12:11:30 -0800 [thread overview]
Message-ID: <3E53E4F2.3020805@mvista.com> (raw)
In-Reply-To: <20030219181822.14372.qmail@web41205.mail.yahoo.com>
Prakash kanthi wrote:
> Hi Folks,
>
> I observed that, even after linux boots and INIT
> process starts, rs_timer stays active and causes the
> rs_interrupt_single to be called.
Depending on your board and the kernel version you're using, this might
be the result of using IRQ 0 for ttyS0 interrupts (as occurs for ppc_405
boards). The stock kernel from kernel.org does not recognize IRQ 0 as a
valid value, and sets up rs_timer polling instead. Recent
linuxppc_2_4_devel kernels (and perhaps other ppc kernel trees) are
modified to remove this restriction; see modifications to
drivers/char/serial.c that remove checks for "irq != 0" and such.
MontaVista Linux makes this an optional feature, enabled by defining
SERIAL_IRQ0_VALID.
--
Todd
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2003-02-19 20:11 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-18 21:37 405GP external master Root User
2003-02-18 22:01 ` Chris Zimman
2003-02-19 18:18 ` rs_timer Prakash kanthi
2003-02-19 20:11 ` Todd Poynor [this message]
2003-02-27 17:30 ` ELDK on windows/cygwin Prakash kanthi
2003-02-27 19:32 ` Wolfgang Denk
2003-03-26 7:01 ` Flash File System Prakash kanthi
2003-03-26 7:34 ` Wolfgang Denk
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