89 lines
3.1 KiB
Text
89 lines
3.1 KiB
Text
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multi-monitor support is still very experimental, and not
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very easy to setup. Here's a copy of a message I sent to
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the mailing list:
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First: only nvidia, 3dfx, sis and i740 cards can be secondary cards,
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(though the primary can be anything, including vesa).
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Second: as far as I can understand, once both cards are enabled, there
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ought to be a resource contention (in hardware) between the cards for
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the vga regions (IO 0x3c0-0x3df and MEM 0xa0000-0xbffff). I don't know
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how it is supposed to be solved, but in practice, if I ignore it in my
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system, it just works.
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If anybody else has successfully run svgalib on a secondary card, please
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tell me, and if you had to do something different from what I did, a
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detailed report to the list might help others.
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Here's my setup:
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I have two vga cards: AGP (1:0.0) nVidia TNT2 and (PCI0:0f.0) Riva128.
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The AGP card is the primary (in the BIOS option "initialize AGP card
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first" is selected). My boot sequence includes the following code to
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initialize the secondary card:
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/usr/local/sbin/vbios.x86emu
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/usr/local/sbin/vga_reset
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/sbin/setpci -s 00:0f.0 COMMAND=2
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the vbios.x86emu is the same as distributed in x86emu-0.6 (from ftp.scitechsoft.com)
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except that in debug.h the line
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#define CONFIG_ACTIVE_DEVICE 1
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is replaced by
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#define CONFIG_ACTIVE_DEVICE 0
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(so that the active device is not initialized by x86emu).
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the setpci line enables memory access (of the drivers supporting
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secondary card, nv3 and i740 use only memory mapped IO, sis and banshee
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need I/O access as well, so you need COMMAND=3). The COMMAND register
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might have other bits set, so you might try to see its value first, and
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then set the 0,1 bits.
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I have two config files in /etc/vga:
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libvga.config.0 - for the scondary card:
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novccontrol
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secondary
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include /etc/vga/libvga.config.common
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HorizSync 30 54
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VertRefresh 40 120
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The novccontrol and secondary options are necessary for a secondary
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card. The include statement is for a card with common configurations -
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mouse, keyboard, etc.
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libvga.config.1 - for the primary:
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PCIStart 1 0
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include /etc/vga/libvga.config.common
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HorizSync 30 115
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VertRefresh 40 160
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The pcistart option is necessary to make sure that svgalib skips the
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first card (in PCI order), and so finds the AGP card.
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to run a program on the primary card, in the usual way, I do
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export SVGALIB_CARD=1
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/svgalib/demos/vgatest
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to run a program on the secondary card:
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export SVGALIB_CARD=0
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/svgalib/demos/vgatest
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There are a few differences for a program running on secondary card:
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- The program is not aware of VC switches, so you can switch to another
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console, and the program will still run (and display).
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- The program can't event system (mouse or raw keyboard).
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- Standard VGA modes and paged memory modes might have problems.
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What this limitations mean is that usual svgalib program might not be
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useful for a secondary card. I use the secondary display for
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watching TV, movies and slideshows. Eye candy programs (such as
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synaesthesia) might also work, after a few changes, but interactive
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programs (zgv, games) are unusable right now. I intend to add support
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for Vojtech Pavlik's input event system to svgalib-2.0, so that
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interactive program will be usable as well.
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