Hi Folks,
I am trying to bring Xorg 7.x on PowerPC 440EPx Sequoia board, X is
configured to use sisfb for video and the sisfb is loaded properly in
kernel and registered as fb0, running X causes a machine check exception
/ BUS error by kernel.
The reason for that is in :-
xorg/xorg-server/hw/xfree86/os-support/linux/lnx_video.c:558
X is doing the following :-
----
ioBase_phys = syscall(__NR_pciconfig_iobase, 2, 0, 0);
fd = open("/dev/mem", O_RDWR);
if (ioBase == NULL) {
ioBase = (volatile unsigned char *)mmap(0, 0x20000,
PROT_READ | PROT_WRITE, MAP_SHARED,
ioBase_phys);
----
the pci I/O memory in my case is 36-bits but the CPU is 32-bits so the
ioBase_phys is getting truncated as long is 32-bits and when later X try
to write to this address causes a BUS error.
Since i know the ioBase_phys address which is 0x1E8000000, I could hard
code it but the mmap(..) offset size is 32-bits as well, so I could not
pass it as an offset.
How would i pass a large offset to mmap on PPC32? is there any other way
to do it?
any help is highly appreciated.
thanks,
~basit
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