[Qemu-devel] How can I make serial console works

[Qemu-devel] How can I make serial console works

[Zhi-zhou Zhang]

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HI All,
I am working on adding openrisc to qemu target. Till now I have done the
cpu part. I use it to run linux kernel. it can run to the end of linux
kernel. but there is no any message to the console.What should I do? Does
timer and pic must implement first? Need I implement a serial port or just
setup IO address?
I am looking forward to you help,thank you!

-- 
Regards,
Zhizhou Zhang

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Re: [Qemu-devel] How can I make serial console works

[Andreas Färber]

Hi,

Am 07.03.2012 03:36, schrieb Zhi-zhou Zhang:
> I am working on adding openrisc to qemu target. Till now I have done the
> cpu part. I use it to run linux kernel. it can run to the end of linux
> kernel.

How do you know? :)

> but there is no any message to the console.What should I do?
> Does timer and pic must implement first? Need I implement a serial port
> or just setup IO address?

For a serial console you need a serial port, yes. Whether you can reuse,
e.g., the memory-mapped serial port or need to write your own device
depends on the hardware you're trying to match and that also determines
what dependencies you have - timer and PIC are likely.

Have you checked http://repo.or.cz/w/qemu/openrisc.git?

Regards,
Andreas

-- 
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GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg

Re: [Qemu-devel] How can I make serial console works

[Zhi-zhou Zhang]

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Sorry for resend this mail, for I can't see it untill now, I thought I had
failed send to the mailist.

On Wed, Mar 7, 2012 at 3:35 PM, Andreas Färber <afaerber@suse.de> wrote:
>
> How do you know? :)
>
 I added a function in op_helper.c, then every insn will dump all the
registers when it runs. I traced the log and was sure that we had get to
the rest_init().

>
> > but there is no any message to the console.What should I do?
> > Does timer and pic must implement first? Need I implement a serial port
> > or just setup IO address?
>
> For a serial console you need a serial port, yes. Whether you can reuse,
> e.g., the memory-mapped serial port or need to write your own device
> depends on the hardware you're trying to match and that also determines
> what dependencies you have - timer and PIC are likely.
>
> I want to use 8250, it seems it needs PIC and timer.
I have finished openrisc's timer(there is still some pits), and want to use
8259.
 But I don't how to start.

> Have you checked http://repo.or.cz/w/qemu/openrisc.git?
>
> No, we did it from zero. I will check it for reference.


-- 
Regards,
Zhizhou Zhang

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