From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Woody Wu <narkewoody@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 8250 UART doesn't work
Date: Fri, 7 Dec 2012 10:04:38 +0000 [thread overview]
Message-ID: <20121207100438.136dd968@pyramind.ukuu.org.uk> (raw)
In-Reply-To: <slrnkc2o7b.2ck.narkewoody@zuhnb712.local.com>
> The UART controller is EXAR ST16C554D. It claims as a 16550
> compatible controller. Each ST16C554D module contains 4 UART, each of
> them can be selected via two chip select pad. I think the board
> hardware, via a CPLD, make the chip selection transparent to the CPU, so
> by a 5-bit address, CPU can addressing individual 8 16550 compatible
> registers of each UART.
The EXAR should work. Make sure you have all the addressing and setup
right would be my first suggestion - then poke at the registers by hand
and double check.
Alan
next prev parent reply other threads:[~2012-12-07 9:59 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-06 7:56 Woody Wu
2012-12-06 18:43 ` H. Peter Anvin
2012-12-07 3:23 ` Woody Wu
2012-12-07 10:04 ` Alan Cox [this message]
2012-12-08 17:01 ` Woody Wu
2012-12-08 22:52 ` Alan Cox
2012-12-09 6:21 ` Woody Wu
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