Thanks Evan! (sorry for the delay in replying -- I was on vacation all last week and I'm *still* catching up...)
Lief -- does this look good to you? On Apr 13, 2012, at 11:13 PM, Evan Clinton wrote: > At present Open MPI only supports ARMv7 processors. Attached is a > patch against current trunk (r26270) that extends the atomic > operations and memory barriers code to work with ARMv5 and ARMv6 ones, > too. > > For v6, the only changes were to use "mcr p15, 0, r0, c7, c10, 5" > instead of the unavailable DMB instruction, and to disable the 64 bit > compare-exchange function (which I understand is not vital for Open > MPI on 32 bit platforms?). For v5, it was a bit trickier; the > processor lacks nice memory barrier instructions or proper atomic > operations. Fortunately, the Linux kernel offers several helper > functions on ARM, and I've used those here. > > The changes build and pass all of the assembly-related tests in the > test folder and the hello world examples run on my "armv5tel" box > running Debian with Linux 2.6.32-5. It should also run fine on ARMv6 > boxes, and presumably v4, but I don't have either to test on. > > Documentation for the Linux kernel helper functions: > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=Documentation/arm/kernel_user_helpers.txt > > I've sent in a contributor agreement so there should be no IP problems. > > Hopefully this is useful, > Evan Clinton > <ompi_armv5.diff>_______________________________________________ > devel mailing list > de...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/devel -- Jeff Squyres jsquy...@cisco.com For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
