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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=3E53E4F2.3020805@mvista.com \
--to=tpoynor@mvista$(echo .)com \
--cc=linuxppc-embedded@lists$(echo .)linuxppc.org \
--cc=pkanthi@yahoo$(echo .)com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox