There are four PCI video cards on the mainboard. They are the same with each
other. I have
written the driver myself running in XFree86 4.2.0. The four video cards work
fine in Redhat
7.0 when setting "xinerama" in the config file.
Then I upgrade the driver in order to run in Xorg 1.6.4. The new driver can
only make the
primary video card work fine in Ubuntu 9.10(XServer version is 1.6.4) . But it
cannot make
four video cards work fine at the same time when setting "xinerama" in the
config file. In
the log I find that it can read rom of the primary video card. But it cannot
read roms of
the other video cards. The Xserver reports an error:
Cannot read V_BIOS (3) Input/output error
I do some further work.
First I type the command "lspci -nv" and find the four video cards in pci
address 03:01.0,
03:02.0, 03:03.0 and 03:04.0.
In "sys/bus/pci/devices/", there are four directories "0000:03:01.0\",
"0000:03:02.0\",
"0000:03:03.0\", "0000:03:04.0\". And there is a file named rom in each of the
four
directories.
In Xserver's log file, I find that information about video bios of the four
video cards
are as follows.
Primary V_BIOS segment is: 0xc000 (the primary card)
Cannot read V_BIOS (3) Input/output error (the other cards)
Then I tracked into source code of XServer and libpciaccess. In function
xf86ExtendedInitInt10 in hw\xfree86\int10\generic.c, function
pci_device_read_rom is called.
Function pci_device_read_rom calls function pci_device_linux_sysfs_read_rom in
libpciaccess
-0.10.6\src\linux_sysfs.c. In function pci_device_linux_sysfs_read_rom, it read
file
"0000:03:0x.0\rom". This is where the error occurs. An error returns when
reading
"0000:03:02.0\rom" or "0000:03:03.0\rom" or "0000:03:04.0\rom". I wonder why it
failed when
reading "0000:03:02.0\rom" or "0000:03:03.0\rom" or "0000:03:04.0\rom" while it
succedded
when reading "0000:03:01.0\rom"?
I believe each video bios is needed to be called to initialise each video
card. But video
bios of the 2nd, 3rd and 4th video card haven't been called successfully.
Any comments on this question would be appreciated.
Harry_______________________________________________
[email protected]: X.Org support
Archives: http://lists.freedesktop.org/archives/xorg
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