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 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 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: implementing "suspend to ram" on cortex A8 based on linux 3.0.8
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. > 在 2012年3月9日 下午10:08，Chenglie He 写道： > >> Hi, >> >> I am doing this on A9, echo mem >/sys/power/state is right, will trigger >> kernel to sleep. >> >> -jack > some recipient promote: "The message contains HTML subpart, therefore we consider it SPAM or Outlook Virus" so i resend the email, hope it not disturb u. thanks a lot. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: implementing "suspend to ram" on cortex A8 based on linux 3.0.8
On Wed, Mar 7, 2012 at 12:05 PM, yang gqyang wrote: > dear all: > I am working on arm cortex a8 now, trying to implement "suspend to ram" > based on linux 3.0.8. Which CPU exactly are you using? -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
