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From: | Gerd Hoffmann |
Subject: | [Qemu-devel] Re: [PATCH] update bochs vbe interface |
Date: | Thu, 25 Mar 2010 09:22:14 +0100 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.8) Gecko/20100301 Fedora/3.0.3-1.fc12 Thunderbird/3.0.3 |
On 03/24/10 23:28, Juan Quintela wrote:
Humm, I think it means. Can you migrate from a "new" vga to an old one, and maintain it working?
Depends on the vgabios version.vgabios 0.6c will not support vesa gfx modes on older qemu, no matter whenever you started fresh or migrated to it.
- s->vbe_regs[VBE_DISPI_INDEX_ID] = VBE_DISPI_ID0; + s->vbe_regs[VBE_DISPI_INDEX_ID] = VBE_DISPI_ID5; + s->vbe_regs[VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = s->vram_size / (64 * 1024);
After migration, vbe_regs[VBE_DISPI_INDEX_ID] would have the value VBE_DISPI_ID5, but vbe_regs[VBE_DISPI_INDEX_VIDEO_MEMORY_64K] will have any random value, no?
vgabios uses both once at init time. resetting vga will reset the vbe regs too. So when migrating from new to old qemu: Before reset vgabios will have the video memory size saved somewhere. After reset ID will reset to ID0, and in case you are running vgabios 0.6c vesa gfx modes will stop working.
cheers, Gerd
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