From: Gary Thomas <gary@mlbassoc.com>
To: Jon Ringle <JRingle@vertical.com>
Cc: Andrew Lunn <andrew@lunn.ch>, ecos-discuss@ecos.sourceware.org
Subject: Re: [ECOS] remote syslog support in Redboot?
Date: Thu, 10 May 2007 16:02:00 -0000 [thread overview]
Message-ID: <464331E6.9070800@mlbassoc.com> (raw)
In-Reply-To: <4DD3AF7ECBBC43409BA36508938D0185123B75@CVAEX1.VERTICAL.COM>
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Jon Ringle wrote:
> On Thursday, May 10, 2007 7:56 AM, Andrew Lunn wrote:
>> On Wed, May 09, 2007 at 03:12:29PM -0400, Jon Ringle wrote:
>>> Has anyone implemented the ability to have diag_printf() messages be
>>> sent to a remote syslog server in Redboot/ecos?
>> You will have to be careful when doing this. diag_printf() uses a very
>> simple polled IO, blocking serial device driver. The idea is that it
>> should always work, in any context. So you can do a diag_printf() in
>> an ISR or a DSR, not just a thread. It is also guaranteed the output
>> will be out the serial port before diag_printf() returns.
>
> How is this guaranteed if I connect to Redboot on tcp port 9000?
RedBoot uses a polled TCP connection, thus when you make a
call to diag_printf() that channels through RedBoot, it _will_
complete at the receiver before continuing. Interrupts are
off during this time, so it's safe even in ISR/DSR context.
Note: there can be issues if you try to send such messages from
within the network stack/drivers and these are routed
directly to the serial console, not over the network.
- --
- ------------------------------------------------------------
Gary Thomas | Consulting for the
MLB Associates | Embedded world
- ------------------------------------------------------------
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--
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next prev parent reply other threads:[~2007-05-10 14:53 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-09 22:50 Jon Ringle
2007-05-10 14:13 ` Andrew Lunn
2007-05-10 14:53 ` Jon Ringle
2007-05-10 16:02 ` Gary Thomas [this message]
2007-05-10 21:40 ` [ECOS] " Grant Edwards
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