Further examination of my issue with dhcpcd not working led me to
enabling "Packet socket" and "Packet socket: mmapped IO" in the kernel
config networking options. Enabling "Packet socket: mmapped IO" leads
to a kernel build failure:
undefined reference to vm_insert_page() in function 'packet_mmap'
Console snippet of error message:
CHK include/linux/version.h
CHK include/linux/utsrelease.h
CHK include/linux/compile.h
GEN usr/initramfs_data.cpio.gz
AS usr/initramfs_data.o
LD usr/built-in.o
CC net/packet/af_packet.o
LD net/packet/built-in.o
LD net/built-in.o
GEN .version
CHK include/linux/compile.h
UPD include/linux/compile.h
CC init/version.o
LD init/built-in.o
LD vmlinux
net/built-in.o: In function `packet_mmap':
net/built-in.o(.text+0x6b30c): undefined reference to `vm_insert_page'
make[1]: *** [vmlinux] Error 1
make[1]: Leaving directory `/mnt/devtools/PetaLinux/software/linux-
2.6.x-petalogix'
make: *** [linux] Error 1
Xil_92:[root@localhost petalinux-dist]#
I found an old post from uclinux-dev
(http://readlist.com/lists/uclinux.org/uclinux-dev/0/4303.html) that
indicates this issue affects mmu-less architectures:
<snip>
vm_insert_page() is in mm/memory.c, but mm/Makefile doesn't include it
in the !MMU case. Instead, mm/Makefile uses mm/nommu.c, which doesn't
have a vm_insert_page(). So, either nommu.c needs an equivalent for
vm_insert_page(), or CONFIG_PACKET_MMAP needs to be made dependent on
CONFIG_MMU.
<snip>
That would obviously include my current Microblaze project with
PetaLinux. Does anyone have any insights for a fix? A patch?
BTW, interestingly enough, enabling "Packet socket" did not fix the boot
error message I get from dhcpcd (dhcpcd[41]: dhcpStart: socket: Address
family not supported by protocol).
Best Regards,
Tom
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