Cross-compiling L4Re for MIPS32
paul at boddie.org.uk
Sun Jun 12 01:19:26 CEST 2016
I finally got round to looking at L4/Fiasco.OC again, and having previously
looked at the MIPS32 port that was made available on GitHub...
...I have been attempting to cross-compile Fiasco and L4Re using the l4re.org
sources. Getting Fiasco to cross-compile was mostly a matter of repeating the
same procedure as last time:
However, I needed to edit src/kernel/fiasco/src/Makeconf.mips32 to change the
compiler settings. I'm using the toolchains in Debian unstable:
CROSS_COMPILE ?= mipsel-linux-gnu-
Previously, I used a Makeconf.local file to set the following:
SHARED_FLAGS=-mips32r2 -EL -msoft-float -mno-abicalls -fno-pic
Maybe the previous work used some different mechanisms to those used by the
more general source distribution, but this trick didn't seem to influence the
build successfully this time around. However, the build did complete
successfully with the toolchain set appropriately.
Meanwhile, I had more problems with the L4Re part. I had expected to be able
to do the following:
make O=mybuild config
make O=mybuild E=mips-fbspectrum
(The target was something that I had managed to build previously after some
messing around with packages and configuration files. I'd managed to build the
fbspectrum example for Fiasco.OC-UX, as the list archives will attest.)
However, I also had to change the compiler settings (as done above) in
src/l4/mk/arch/Makeconf.mips, instead of using src/l4/Makeconf.local (as done
previously). Again, maybe the way of doing things was different in the
previous incarnation of this port.
I also needed to edit src/l4/tool/gendep/syscall.c to add a definition before
unistd.h gets included:
I can't remember if I or anyone else has mentioned this before now, but
without it, things like __NR_open are not defined.
Unfortunately, I haven't yet reached a satisfactory conclusion in this latter
exercise. Looking back at my previous messages, it seems that a bit more work
might be needed to configure and build a suitable target, and so I was
wondering if anyone had done this (and written it up) for any of the MIPS
boards, perhaps the CI20. Indeed, I wonder if things like the framebuffer are
even supported for the CI20 or other MIPS boards.
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