On Fri, 2012-03-16 at 16:44 +0000, Mark Cave-Ayland wrote: > Hi all, > > Whilst looking at Jakub's bug report here > https://bugs.launchpad.net/qemu/+bug/942299, I've been working on a > patch to correct the QEMU interrupt handler on qemu-ppc. Now that this > bug is close to being fixed, I've had a look at OpenBIOS to find out why > newer versions of OpenBIOS freeze before the HelenOS loading screen.
I observed that as well, it hangs some time during the display of the boot messages. > A local git bisect shows that the culprit is actually this commit: > > commit b6de01a59394f1fafbfb2c65cb784c9d23067fa2 > Author: laurent <laurent@f158a5a8-5612-0410-a976-696ce0be7e32> > Date: Tue Aug 4 21:08:37 2009 +0000 > > Allows to configure screen size from Qemu command line options > using FW_CFG > interface. > Only enabled for PPC/QEMU and VGA/VBE. I'm surprised by that. This has worked well for a long time, I think something else in qemu causes that commit to fail. > git-svn-id: svn://openbios.org/openbios/trunk@538 > f158a5a8-5612-0410-a976-696ce0be7e32 > > Having stepped through vga_vbe_init() in drivers/vga_vbe.c, the only > difference is that reading the display depth from the QEMU FW CFG > interface returns 15 instead of the in-built OpenBIOS default of 8. AFAIK that's been working fine for a while... > So is a bit-depth of 15 supported by OpenBIOS? This seems quite unusual > given that it is not a power of 2; however if I use GDB to override the > value to 16 then HelenOS boots but with a blue screen BIOS on VGA so I'm > not sure that is the correct solution either. Does anyone know what the > default bit-depth is in Apple's firmware? Cheers, Ben. _______________________________________________ HelenOS-devel mailing list [email protected] http://lists.modry.cz/cgi-bin/listinfo/helenos-devel
