2.11BSD operating system for microcontrollers
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PostPosted: Wed Jul 29, 2015 8:40 am 

Joined: Wed Jul 29, 2015 8:32 am
Posts: 3

Sorry if this is an elementary question but I do not know what to do. I've been following the guide here:

When I started to compile using make, it ran for a while then stopped here:
/usr/local/pic32-tools/bin/pic32-gcc -EL -g -mips32r2 -nostdinc -fno-builtin -Werror -Wall -fno-dwarf2-cfi-asm -Wl,--oformat=elf32-tradlittlemips -nostdlib -T ../../../tools/configsys/../../sys/pic32/cfg/bootloader-maximite.ld -Wl, clock.o cons.o devsw.o exception.o exec_aout.o exec_conf.o exec_elf.o exec_script.o exec_subr.o gpio.o init_main.o init_sysent.o kern_clock.o kern_descrip.o kern_exec.o kern_exit.o kern_fork.o kern_mman.o kern_proc.o kern_prot.o kern_prot2.o kern_resource.o kern_sig.o kern_sig2.o kern_subr.o kern_synch.o kern_sysctl.o kern_time.o machdep.o mem.o rd_sd.o rdisk.o signal.o spi_bus.o startup.o subr_prf.o subr_rmap.o swap.o sys_generic.o sys_inode.o sys_pipe.o sys_process.o syscalls.o sysctl.o tty.o tty_subr.o tty_tty.o uart.o ufs_alloc.o ufs_bio.o ufs_bmap.o ufs_dsort.o ufs_fio.o ufs_inode.o ufs_mount.o ufs_namei.o ufs_subr.o ufs_syscalls.o ufs_syscalls2.o vers.o vfs_vnops.o vm_sched.o vm_swap.o vm_swp.o  -o unix.elf
/usr/local/pic32-tools/bin/../lib/gcc/pic32mx/4.5.2/../../../../pic32mx/lib/debug-exception-return.o: In function `__DbgExecReturn':
(._debug_exception+0x8): undefined reference to `__pic32_software_reset'
/usr/local/pic32-tools/bin/../lib/gcc/pic32mx/4.5.2/../../../../pic32mx/lib/debug-exception-return.o: In function `__DbgExecReturn':
(._debug_exception+0xc): undefined reference to `__pic32_software_reset'
collect2: ld returned 1 exit status
make[2]: *** [unix.elf] Error 1
make[2]: Leaving directory `/root/retrobsd/sys/pic32/duinomite-uart'
make[1]: *** [kernel] Error 2
make[1]: Leaving directory `/root/retrobsd'
make: *** [all] Error 2

Again, I apologize if this is elementary but I am sure someone else has had the same question down the line. Messing with linkers is something I have put off, and I have no idea how to fix this. I would have used one of the prebuilt binary packages for the Duinomite-Mini but the build server/mirror seems to be down!


PostPosted: Sat Aug 01, 2015 11:49 pm 
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Joined: Wed Oct 10, 2012 11:01 pm
Posts: 1081
Location: Sunnyvale, CA

It's something related to your version of GCC toolchain. I just double-checked - the kernel builds fine on Linux and Mac OS with the latest Jason's toolchain (

The issue is that the compiler tries to link in the __DbgExecReturn function from /usr/local/pic32-tools/pic32mx/lib/debug-exception-return.o file. This file is not present in Jason's toolchain. The RetroBSD kernel by itself does not require this file to be linked.

Best wishes,

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