SGI, MIPS, Hardhat Linux question...

I am currently working on a project that is using a MIPS R4x00 core on a single board computer and would like to leverage the work the SGI team has done on the MIPS/Linux port. I have downloaded the kernel source code for Hardhat Linux (kernel 2.1.100) and applied the patches (i.e., kernel-2.1.100-sgi.patch and kernel-mips-link.patch). I have also downloaded Ralf Bachle's cross compiler tools (486-linux -> MIPS). We
are using the little endian version of the tools. I copied the kernel
files to my home directory under the structure <my_home_dir>\work\linux and applied the patches. The patches applied properly. I then did a default configuration, following the file kernel-config.sgi as a template. I built the dependencies ( make CROSS_COMPILE=mipsel-linux- dep) and did not get any errors. The problem seems to occur when I attempt to build the compressed image, I enter the command:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - make CROSS_COMPILE=mipsel-linux- zImage
mipsel-linux-gcc -D__KERNEL__ -I/home/jharrell/work/linux/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -G 0 -mno-abicalls -fno-pic -g -mcpu=r4600 -mips2 -pipe -c -o init/main.o init/main.c /home/jharrell/work/linux/include/asm/string.h: In function `bcopy':
In file included from /home/jharrell/work/linux/include/linux/string.h:39,
from
/home/jharrell/work/linux/include/asm/termios.h:99,
from
/home/jharrell/work/linux/include/linux/termios.h:5,
from
/home/jharrell/work/linux/include/linux/tty.h:20,
from
/home/jharrell/work/linux/include/linux/sched.h:20,

                 from init/main.c:17:

/home/jharrell/work/linux/include/asm/string.h:134: warning: control reaches end of non-void function /home/jharrell/work/linux/include/linux/sched.h: In function `suser':
In file included from init/main.c:17:
/home/jharrell/work/linux/include/linux/sched.h:545: `current' undeclared (first use this function) /home/jharrell/work/linux/include/linux/sched.h:545: (Each undeclared identifier is reported only once /home/jharrell/work/linux/include/linux/sched.h:545: for each function it appears in.) /home/jharrell/work/linux/include/linux/sched.h: In function `fsuser':
/home/jharrell/work/linux/include/linux/sched.h:554: current' undeclared (first use this function) /home/jharrell/work/linux/include/linux/sched.h: In function capable':
/home/jharrell/work/linux/include/linux/sched.h:572: current' undeclared (first use this function) /home/jharrell/work/linux/include/linux/mm.h: In function expand_stack':
In file included from /home/jharrell/work/linux/include/linux/slab.h:14,
from
/home/jharrell/work/linux/include/linux/malloc.h:4,
from
/home/jharrell/work/linux/include/linux/proc_fs.h:6,

                 from init/main.c:25:

/home/jharrell/work/linux/include/linux/mm.h:359: `current' undeclared (first use this function)
make: *** [init/main.o] Error 1
Compilation exited abnormally with code 2 at Tue Nov 2 14:14:55
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - -

I checked the linkage in the linux/include directory and a link exists between asm and mips-asm. For some reason it is not able to find the files located in the include/asm directory, I looked over the gcc man page and read that if a -I is used as a parameter to gcc, it should be the first directory examined in the search patch.....It seems to have problems with the #include <asm/current.h>. Am I missing something? Hmmm....

A second question I would like to ask is concerning the Hardhat distribution, Is this the best starting place to get an embedded version of MIPS/Linux? Is there a better distribution (i.e. Cross-compilation tools, etc., that uses a more current version of the kernel?) Any information available would be greatly appreciated....

Thanks,
Jeff Harrell

Jeff Harrell ([email protected]) work: (801) 984-0183
TI / Broadband Access Group

Hi:

I got the CVS sources for Kernel (2.3.19) and exactly the
same error messages appears I'm using an HardHat 5.1 with 2.1.100 on a SGI Indy 5000 so maybe it isn't a cross-compiler error. I also checked the symlinks and seems ok....
Any suggestions ?

Thanks.
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Are you using gcc or egcs to cross-compiler? If I remember correctly that message is caused by the gcc specs file that isn't compatible with the current MIPS kernels. Use this cross-compiler instead:

    ftp://oss.sgi.com/pub/linux/mips/crossdev/i386-linux/mips-linux/

And don't forget to turn off the -N option in arch/mips/Makefiles, or it will not boot.

Ulf

I got the same message when trying to compile the ftape driver on an x86 box.
It's been a long time since I tried it but I do distinctly remember tracing it to
what you were talking about.

"It seems to have problems with the #include <asm/current.h>." I'm not sure if your problem is related to mine but could be.

It happened after a kernel upgrade, using RH.

Frank

_______________________________________________________________
Frank B. Pound                    Phone: 703-560-5000 ext. 4008 
Raytheon Systems Company Strategic Systems Division
E-mail: [email protected]
Web: http://www.raytheon.com/rsc/c3/c300.htm
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