Re: [Qemu-devel] qemu-system-sh4 vs qemu-system-arm/i386 default behavior

[Thomas Huth]

On 30.11.2016 09:02, Aurelien Jarno wrote:
> On 2016-11-30 08:33, Thomas Huth wrote:
>> On 30.11.2016 02:01, Tom Rini wrote:
>>> Hey all,
>>>
>>> I'm trying to make use of the r2d platform for U-Boot testing via QEMU.
>>> After applying a series[1] I can use the kernel.org sh4 toolchain to get
>>> a u-boot.bin that runs, mostly.  I say mostly as first of all I have to
>>> pass "-monitor null -serial null -serial stdio -nographic" to
>>> qemu-system-sh4 and in that order for me to get output from U-Boot on
>>> the prompt.  On other platforms such as arm and vexpress or i386 and the
>>> 'pc' machine I do not need to do this.  Does anyone have any idea why
>>> this might be and where to start poking in the code to fix this?
> 
> The reason is that u-boot and the linux kernel do not have the same way
> to number the serial port than the physical hardware. Therefore u-boot
> and the Linux kernel use the second physical serial port .The question is
> whether we should number our ports from the software (or part of the
> sofrware) or hardware point of view.

OK, thanks for the explanation, that makes sense now. ... maybe we
should put this information on a SH4 machine page under
http://qemu-project.org/Documentation/Platforms so that users have a
possibility to understand this serial port numbering?

 Thomas

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