linux-kernel - Re: implementing "suspend to ram" on cortex A8 based on linux 3.0.8

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Date:	Tue, 13 Mar 2012 22:34:18 +0800
From:	Barry Song <21cnbao@...il.com>
To:	yang gqyang <hustgqyang@...il.com>
Cc:	Chenglie He <chengjie.he@...aro.org>,
	Robert Lee <rob.lee@...aro.org>, nicolas.pitre@...aro.org,
	venki@...gle.com, linaro-dev@...ts.linaro.org,
	linux-sh@...r.kernel.org, tony@...mide.com, linux@....linux.org.uk,
	ccross@...gle.com, kernel@...tstofly.org, khilman@...com,
	kgene.kim@...sung.com, magnus.damm@...il.com,
	arnd.bergmann@...aro.org, jon-hunter@...com, len.brown@...el.com,
	patches@...aro.org, nsekhar@...com, rjw@...k.pl,
	Baohua.Song@....com, linux-omap@...r.kernel.org,
	linux@...im.org.za, linux-arm-kernel@...ts.infradead.org,
	deepthi@...ux.vnet.ibm.com, g.trinabh@...il.com,
	linux-pm@...r.kernel.org, broonie@...nsource.wolfsonmicro.com,
	linux-kernel@...r.kernel.org, lethal@...ux-sh.org
Subject: Re: implementing "suspend to ram" on cortex A8 based on linux 3.0.8

hi yang,

在 2012年3月10日 下午10:37，yang gqyang <hustgqyang@...il.com> 写道：
>  Thanks for your comment.
>  Finally, i find out that i made a mistake.  The uart(8250) have not been
>  restore after resume, instead, it use the configuration got from boot. The
>  uart have not been restored correctly, so that "ls" can not output result
>  correctly resulting in it seems that the busybox can not work correctly.
>  Now, i still have a question about the uart: why the "printk" can work
>  correctly, but the "printf" not?
>
>  Before this, i believe that the "printk" work correctly, then the uart
>  work ok. but now, i  need more reconsidaration about
>  the relation between the "printk", "printf" and "uart".
>  Can anyone give me some suggestion? Any comment is welcome, thanks a
>  lot.

printk use "struct console" driver, it doesn't depend on a device node
for userspace.
printf actaully depends on uart_driver and a /dev/ttySx device node,
stdout and stderr are redirected to /dev/ttySx
uart is just a hardware which can be a tty or kernel console output.


>
>
-barry
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