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Date: Mon, 10 May 2010 17:48:56 +0200
From: Aurelien Jarno <aurelien@aurel32.net>
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Subject: Re: [Qemu-devel] qemu-system-sh4 broken again.
References: <201003130151.36065.rob@landley.net>
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	<201003141908.41360.rob@landley.net>
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To: Shin-ichiro KAWASAKI <kawasaki@juno.dti.ne.jp>
Cc: qemu-devel@nongnu.org

Shin-ichiro KAWASAKI a écrit :
> Hello, Rob,
> 
> This mail might be too late, but I want to report you that I
> encountered similar trouble.
> 
> Using the linux kernel after the following commit, the qemu-sh
> serial console shows no output.
> 
>    cd5f107628ab89c5dec5ad923f1c27f4cba41972
> 
> This trouble was discussed in sh-linux ML.
> 
>    http://marc.info/?l=linux-sh&m=127183863325672&w=2
> 
> To avoid this,
> 
>    - add "earlyprintk=sh-sci.1" to kernel command line, and
>    - modify CONFIG_SERIAL_SH_SCI_NR_UARTS valud from 1 to 2,
> 
> in kernel configuration menu.
> 
> I hope that this is the trouble you see.
> 

The main problem here is that QEMU emulates both SCI channels as serial
port, while the real board has one of the two channel configured as a
SPI bus (for the RTC clock), and the other as a serial port.

-- 
Aurelien Jarno                          GPG: 1024D/F1BCDB73
aurelien@aurel32.net                 http://www.aurel32.net