linux-kernel - Re: serial port 8250 messed up after coverting from little endian to big endian on kernel 2.6.31

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Message-ID: <20091029102652.76d42b8c@pixies.home.jungo.com>
Date:	Thu, 29 Oct 2009 10:26:52 +0200
From:	Shmulik Ladkani <jungoshmulik@...il.com>
To:	myuboot@...tmail.fm
Cc:	"Sergei Shtylyov" <sshtylyov@...mvista.com>,
	"Florian Fainelli" <florian@...nwrt.org>,
	linux-kernel@...r.kernel.org,
	"linux-mips" <linux-mips@...ux-mips.org>, shmulik@...go.com
Subject: Re: serial port 8250 messed up after coverting from little endian
 to big endian on kernel  2.6.31

On Wed, 28 Oct 2009 14:36:15 -0500 myuboot@...tmail.fm wrote:
> I just tried UPIO_MEM32 without adding a offset of 3. But the result is
> bad - after the kernel initializes the serial console, the console print
> out messes up. The early printk is fine because the u-boot initialises
> the serial port fine. 
> 
> Did I miss anything? Thanks again for your help.

I guess you did fine with UPIO_MEM32.

Keeping the UPIO_MEM32 approach, I suggest also to fiddle Y/N with
CONFIG_SWAP_IO_SPACE (might be that you have it set to Y while you don't
really need it, or vice versa).
This is since 'readl' uses 'ioswabl' for (potential) byte-swapping of the read
value. Take a look at asm/io.h and mangle-port.h.

Most important, read your hardware documentation to determine correct access
to the memory mapped serial registers.

-- 
Shmulik Ladkani		Jungo Ltd.
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