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 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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