On 08:18 Sat 28 Jun , Abdul Basit wrote: > Michael Blizek wrote: > > On 00:10 Sat 28 Jun , Abdul Basit wrote: > > > >> 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 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? > >> > > > > You can call mmap2 if the offset is a multiply of 4096. (see the manpage) > > -Michi > > > The type for offset in both mmap() and mmap2() if off_t which is > sizeof(off_t) = 4, infact i can not find mmap2 for powerpc in uclibc, > there is mmap() > which takes __off_t and mmap64() which takes __off64_t but that is only > enabled > if you use __FILE_OFFSET_SIZE=64 which i do not know if i turn it on > what are the consequences? > also internally mmap64() truncates the off64_t to off_t and a comment in > there > to implement architecture specific code in there. > > > Thanks, > ~basit http://www.uclibc.org/cgi-bin/viewcvs.cgi/trunk/uClibc/include/sys/mman.h?rev=22198&view=auto Seems like uclibc does not have mmap2. You can try to copy the mmap2 of glibc somewhere into your project. -Michi -- programing a layer 3+4 network protocol for mesh networks see http://michaelblizek.twilightparadox.com -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
