From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Kumar Gala <galak@kernel.crashing.org>
Cc: linux-kernel@vger.kernel.org, Russell King <rmk+lkml@arm.linux.org.uk>
Subject: Re: [PATCH] Revert serial 8250 console fixes
Date: Mon, 06 Feb 2006 19:38:31 +0000 [thread overview]
Message-ID: <1139254711.10437.42.camel@localhost.localdomain> (raw)
In-Reply-To: <DC17879A-2B03-4D20-865F-C89386A393EF@kernel.crashing.org>
On Llu, 2006-02-06 at 13:14 -0600, Kumar Gala wrote:
> Can you explain further why you had to change wait_for_xmitr() from
> testing BOTH_EMPTY to UART_LSR_THRE.
Because you want to wait for the uart to show that it is ready to accept
a character, not that the byte has been clocked out entirely. Thats
essential for working with virtual serial ports on servers as they use
the fact there is no pending character to work out how to packetize it
as a TCP stream.
> Also, what exactly would you be looking for in a register dump?
When it gets stuck what state are the serial chip registers in and where
is the OS hanging ?
next prev parent reply other threads:[~2006-02-06 19:36 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-06 17:20 Kumar Gala
2006-02-06 18:24 ` Alan Cox
2006-02-06 19:14 ` Kumar Gala
2006-02-06 19:38 ` Alan Cox [this message]
2006-02-06 20:56 ` Kumar Gala
2006-02-06 22:51 ` Alan Cox
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=1139254711.10437.42.camel@localhost.localdomain \
--to=alan@lxorguk.ukuu.org.uk \
--cc=galak@kernel.crashing.org \
--cc=linux-kernel@vger.kernel.org \
--cc=rmk+lkml@arm.linux.org.uk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
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
all inboxes | Powered by JetHome®