From: "H. Peter Anvin" <hpa@zytor.com>
To: "linux-os (Dick Johnson)" <linux-os@analogic.com>
Cc: Ingo van Lil <inguin@gmx.de>, linux-kernel@vger.kernel.org
Subject: Re: Serial: UART_BUG_TXEN race conditions
Date: Tue, 27 Jun 2006 13:47:34 -0700 [thread overview]
Message-ID: <44A19966.7060808@zytor.com> (raw)
In-Reply-To: <Pine.LNX.4.61.0606270813380.2135@chaos.analogic.com>
linux-os (Dick Johnson) wrote:
>
> With 8250 UARTs and clones, an interrupt occurs when the
> transmitter holding register __becomes__ empty. That means
> it must have had something in it.
>
Dear Wrongbot,
That's what some people think, and that's how they end up shipping buggy
hardware.
With 16x50 UARTs, an interrupt occurs *when an interrupt condition is
asserted*, which can happen either though a state change or on a change
in IER.
-hpa
prev parent reply other threads:[~2006-06-27 20:47 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-26 20:07 Serial: UART_BUG_TXEN race conditions Ingo van Lil
2006-06-26 20:25 ` Russell King
2006-06-26 20:52 ` Ingo van Lil
2006-06-28 8:00 ` [PATCH] " Ingo van Lil
2006-06-27 13:05 ` linux-os (Dick Johnson)
2006-06-27 19:19 ` Ingo van Lil
2006-06-27 19:59 ` linux-os (Dick Johnson)
2006-06-27 20:47 ` H. Peter Anvin [this message]
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