Gentoo Archives: gentoo-embedded

From: David Relson <relson@×××××××××××××.com>
To: gentoo-embedded@l.g.o
Cc: manuel.lauss@××××××××××.com
Subject: Re: [gentoo-embedded] High Speed Serial Problem
Date: Sun, 14 Mar 2010 18:07:46
Message-Id: 20100314131442.27eda556@osage.osagesoftware.com
In Reply to: Re: [gentoo-embedded] High Speed Serial Problem by Manuel Lauss
1 On Sun, 14 Mar 2010 17:34:50 +0100
2 Manuel Lauss wrote:
3
4 > David,
5 >
6 > I suggest you post this question to linux-kernel@×××××××××××.org and
7 > linux-serial@×××××××××××.org
8 > instead.
9 >
10 > One question though: does your target have a real (physically real)
11 > uart chip? There are some x86 systems out there which emulate a 8250
12 > through SMM code, which exhibit these kinds of failures at high baud
13 > rates. Do lower baudrates work?
14 >
15 > Best regards,
16 > Manuel Lauss
17
18 Hello Manuel,
19
20 The UARTs are real and work very very well with DOS (remember the 2.5
21 errors per 1000 records).
22
23 The high speed serial device has a fixed 115KB rate and is
24 transferring 4000+ characters per second. With the fixed baud rate,
25 lower baudrates aren't usable, hence can't be tested.
26
27 David