113 lines
4.1 KiB
Plaintext
113 lines
4.1 KiB
Plaintext
configs/skp16c26/README.txt
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^^^^^^^^^^^^^^^^^^^^^^^^^^^
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1. The buildroot package can be used to build an M16C toolchain. The toolchain
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buildroot can be downloaded from misc/buildroot in the NuttX GIT. Insructions
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for building the toolchain are provided below.
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However, the target cannot be built because the GNU m16c-nuttx-elf-ld link fails with
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the following message:
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m32c-nuttx-elf-ld: BFD (GNU Binutils) 2.19 assertion fail /home/Owner/projects/nuttx/buildroot/toolchain_build_m32c/binutils-2.19/bfd/elf32-m32c.c:482
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Where the reference line is:
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/* If the symbol is out of range for a 16-bit address,
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we must have allocated a plt entry. */
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BFD_ASSERT (*plt_offset != (bfd_vma) -1);
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No workaround is known at this time. This is a show stopper for M16C.
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2. A supported version of the M16C toolchain is available here:
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http://www.kpitgnutools.com/index.php
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This download is free but requires registration. Unfortunately, this v0901 of
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this toolchain shows the same behavior:
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c:\Hew3\Tools\KPIT Cummins\GNUM16CM32C-ELF\v0901\m32c-elf\bin\m32c-elf-ld.exe: BFD (GNU Binutils) 2.19-GNUM16CM32C_v0901 assertion fail /home/kpit/fsfsrc/binutils-2.19/bfd/elf32-m32c.c:482
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It is possible that this error messasge my be telling me -- a very roundabout way --
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that I have exceeded the FLASH region, but I think that unlikely (it is difficult
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to know if the link does not complete gracefully).
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BUILDING THE R8C/M16C/M32C GNU TOOLCHAIN USING BUILDROOT
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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NOTE: See the toolchain issues above -- you may not want to waste your time.
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1. CD to the correct directory.
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Change to the directory just above the NuttX installation. If <nuttx-dir> is
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where NuttX is installed, then cd to <nuttx-dir>/..
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2. Get and Install the buildroot Module
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a. Using a release tarball:
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cd <nuttx-dir>/..
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Download the appropriate buildroot package.
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unpack the buildroot package
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rename the directory to buildroot
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b. Using GIT
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Check out the misc/buildroot module. GIT checkout instructions:
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http://sourceforge.net/p/nuttx/git/ci/master/tree/misc/buildroot/
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Make the archive directory:
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mkdir archive
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The <nuttx-dir>/../buildroot is where the toolchain is built;
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The <nuttx-dir>/../archive directory is where toolchain sources will be downloaded.
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3. Make sure that NuttX is configured
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cd <nuttx-dir>/tools
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./configure.sh <nuttx-configuration>
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4. Configure and Make the buildroot
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cd buildroot
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cp configs/m32c-defconfig-4.2.4 .config
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make oldconfig
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make
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This will download the large source packages for the toolchain and build the toolchain.
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The resulting binaries will be under buildroot/build_m32c. There will also be a
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large build directory called toolchain_build_m32c; this directory can be removed once
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the build completes successfully.
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Cygwin GCC BUILD NOTES
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^^^^^^^^^^^^^^^^^^^^^^
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On Cygwin, the buildroot 'make' command will fail with an error like:
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"...
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build/genchecksum cc1-dummy > cc1-checksum.c
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opening cc1-dummy: No such file or directory
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..."
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This is caused because on Cygwin, host executables will be generated with the extension .exe
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and, apparently, the make variable "exeext" is set incorrectly. A work around after the
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above occurs is:
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cd toolchain_build_m32c/gcc-4.2.4-initial/gcc # Go to the directory where error occurred
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mv cc1-dummy.exe cc1-dummy # Rename the executable without .exe
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rm cc1-checksum.c # Get rid of the bad generated file
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Then resume the buildroot make:
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cd - # Back to the buildroot make directory
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make # Restart the build
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GCC is built twice. First a initial, "bootstap" GCC is produced in
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toolchain_build_m32c/gcc-4.2.4-initial, then the final GCC is produced in
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toolchain_build_m32c/gcc-4.2.4-final. The above error will occur twice: Once for
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the intial GCC build (see above) and once for the final GCC build. For the final GCC
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build, the workaround is the same except that the directory will be
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toolchain_build_m32c/gcc-4.2.4-final/gcc.
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