forked from Imagelibrary/rtems
4e4e6911e5
FP issues on this target: The default variants of libc, libm and libgcc assume that a 68881 coprocessor is present. Without the FPSP, any floating point operation, including printf() with a "%f" format specifier, is likely to cause an unimplemented instruction exception. The FPSP works with the default variants of libc, libm and libgcc. It does not work in conjunction with the msoft-float variants. The paranoia test goes into an infinite loop at milestone 40. I am guessing that floor() is returning an incorrect value. The msoft-float variants of libc, libm and libgcc appear to do floating point I/O properly. They only failed in paranoia. Offhand, I can't think of why they would conflict with the FPSP, so I think that there is something wrong with the msoft-float code. It might be my installation. Given my experiences, I decided to install the FPSP in bsp_start(), and to link against the default variants of libc, libm and libgcc. This causes the executables to increase in size by about 60 KB. The README file and the mvme167.cfg specify how to remove the FPSP, and how to link against the msoft-float variants of the libraries. This is not what Eric Norum had done: on my host, his gen68360_040 port links RTEMS code with the msoft-float variants of libc and libm, and the default variant of libgcc. In this configuration, the output of printf() with "%f" is garbage on my target.
#
# $Id$
#
This is the top level of the RTEMS directory structure. The following
is a description of the files and directories in this directory:
Makefile.in
The top-level Make command file used to build the C implementation
of RTEMS. [RTEMS assumes the use of GNU make.]
README
This file.
REQUIRES
A list of the other tools which are assumed to be installed
before RTEMS is built.
SUPPORT
Information on third-party support for RTEMS.
build-tools
This directory contains the source for various utilities
needed to build RTEMS.
make
Make command files "included" from those in the source distribution.
[RTEMS assumes the use of GNU make.]
patches
This directory contains patches for this release of RTEMS.
src
This directory contains the source code for the C
implementation of RTEMS as well as the test suites, sample
applications, Board Support Packages, Device Drivers, and
support libraries.