On Sun, 15 Nov 2009, Stefan Weil wrote: > malc schrieb: > > On Sun, 15 Nov 2009, Gleb Natapov wrote:
[..snip..] > > Here is a summary of my analysis of this problem: > > Graphics mode memory (ram 0xe0000000 ...) is not mapped > in QEMU address space (which results in unassigned > memory writes) for standard pci vga (-vga std), so users > don't get vga display output with grub (in graphical mode), > debian installer (in graphical mode) or similar boot software. > > This happens for PC system emulation using SeaBIOS. > It won't happen when using Bochs BIOS. > > Other system emulations which can run standard pci vga > seem to suffer from the same problem: when I run mips > malta using -vga std, it won't display anything on the vga > screen (it works with cirrus pci vga). > > Malta has no vga bios, so the error might be in QEMU's > vga code (hw/vga-pci.c). Maybe wrong initial PCI mappings? > Maybe this has always be wrong (which would explain why > git bisect does not work). git bisect doesn't work because most of the time: a. Compilation fails b. Compilation succeeds but qemu segfaults before even trying to execute any guest code > > pci_vga_init() is called by sun4u, ppc_prep, ppc_oldworld, > ppc_newworld, pc and mips, so all these emulations > share the same potential problem. > > Bochs BIOS and PC Linux obviously fix the problem. > > Regards, > Stefan > -- mailto:av1...@comtv.ru
