What about cross-compilation?

Posted Feb 7, 2003 15:50 UTC (Fri) by dwmw2 (subscriber, #2063)
In reply to: What about cross-compilation? by sjmadsen
Parent article: Driver porting: compiling external modules

It works perfectly for cross-compilation for me. If you override CROSS_COMPILE (or have it set in your kernel's top-level Makefile) that works just as it always did:@
make KDIR=/local/arm-kernel CROSS_COMPILE=arm-linux-gnu-

Note also that the article is somewhat misleading -- the Makefile fragment

> KERNELDIR = /usr/src/linux
> CFLAGS = -D__KERNEL__ -DMODULE -I$(KERNELDIR)/include -O
>
> all: module.o

... was _always_ broken and nonportable -- building using the kernel makefiles was the only way to get it working portably since about the 2.0 kernel. It doesn't kernel+arch-specific CFLAGS like -mregparm= -mno-gp-opt -mno-implicit-fp right.

to post comments

What about cross-compilation?

Posted Mar 3, 2005 10:48 UTC (Thu) by mhb (guest, #28187) [Link] (3 responses)

I have tried this on the simple hello.c module.
I use the ELDK cross compiler to generate code for
a ppc 440 from an X86 based machine. It fails
with some emulation mode problems, any ideas ?

[root@basher ebonymnt]# export CROSS_COMPILE=ppc_4xx-
[root@basher ebonymnt]# make -C /home/simon/ebonymnt/linux-2.6.10 M=`pwd`
make: Entering directory `/home/simon/ebonymnt/linux-2.6.10'
LD /home/simon/ebonymnt/built-in.o
CC [M] /home/simon/ebonymnt/hello.o
Building modules, stage 2.
MODPOST
CC /home/simon/ebonymnt/hello.mod.o
LD [M] /home/simon/ebonymnt/hello.ko
ppc_4xx-ld: unrecognised emulation mode: elf_i386
Supported emulations: elf32ppclinux elf32ppc elf32ppcsim
make[1]: *** [/home/simon/ebonymnt/hello.ko] Error 1
make: *** [modules] Error 2
make: Leaving directory `/home/simon/ebonymnt/linux-2.6.10'
[root@basher ebonymnt]#

What about cross-compilation?

Posted Oct 14, 2005 0:02 UTC (Fri) by msprauve (guest, #33084) [Link] (1 responses)

Did anyone develop a resolution to this problem?

What about cross-compilation?

Posted May 2, 2006 13:59 UTC (Tue) by DeferX (guest, #37486) [Link]

Tray this
make CROSS_COMPILE=ppc_6xx- ARCH=ppc
It's work

By
defer

What about cross-compilation?

Posted Nov 10, 2005 22:02 UTC (Thu) by urs (guest, #33777) [Link]

You should call

make CROSS_COMPILE=ppc_4xx- -C ...

instead of your command

CROSS_COMPILE=ppc_4xx- make -C ...

which handles make variables differently. See the make manual for details.

urs