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Re: [Qemu-ppc] [HelenOS-devel] Regression in ppc-softmmu when running He

From: Martin Decky
Subject: Re: [Qemu-ppc] [HelenOS-devel] Regression in ppc-softmmu when running HelenOS
Date: Sat, 17 Mar 2012 20:09:04 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.1) Gecko/20120216 Thunderbird/10.0.1

Hi folks,

Actually - don't worry about that. Even when passing QEMU a bit-depth of
16 on the command line, it seems to be clamped internally to 15. It is
possible to override it back to 16 using a debugger, and that boots
HelenOS fine albeit with a lovely blue tinge ;) I suspect that's because
of the bit alignments similar to http://en.wikipedia.org/wiki/High_Color.

Yes, this might be the case, but I wouldn't worry about that right now. As far as I remember we haven't encountered any real PowerPC or SPARC machine with a different default configuration than 8 bpp and that's the reason why the code for such cases (15 bpp, 16 bpp, etc.) in HelenOS is not properly debugged. This can be fixed easily later on by using the correct VISUAL_RGB_5_6_5_BE for 16 bpp.

Anyway, we know now what are the issues and where. Thanks everybody for the cooperation!


Martin Decky

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