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Subject: Re: problem about compiling EPICS base on Int el XScale RISC CPU and Monta Vista Linux
From: Michael Abbott <michael.abbott@diamond.ac.uk>
To: marco_hair <marco_hair@163.com>
Cc: tech-talk@aps.anl.gov
Date: Mon, 26 Jun 2006 10:09:00 +0000 (GMT)
On Mon, 26 Jun 2006, marco_hair wrote:
I am trying to compile EPICS base on our new device. It has a Intel XScale IXP-422 266Mhz RISC CPU and Monta Vista linux as embedded OS.

You might also like to look into your floating point (emulation) support. The XScale doesn't have hardware FP, and if you're using an emulation library which supports the old ARM FPA format then you'll run into a channel access compatibility issue: the network byte order is .. uh .. unexpected.


I have a patch to EPICS, which I believe may make it into .9, which uses the configuration symbol CA_FLOAT_NWFP (NetWinder Floating Point, seems to be the canonical ARM floating point emulation library, as far as I can tell) to enable the appropriate .. strange .. byte ordering for channel access. (The patches are included in the Libera EPICS distribution, http://sourceforge.net/projects/libera-epics .)
References:
problem about compiling EPICS base on Int el XScale RISC CPU and Monta Vista Linux marco_hair

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