linux-kernel - Re: 8250 UART doesn't work

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Message-ID: <20121207100438.136dd968@pyramind.ukuu.org.uk>
Date:	Fri, 7 Dec 2012 10:04:38 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Woody Wu <narkewoody@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 8250 UART doesn't work

> 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
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