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Re: Could not find the source code for "/sbin/init".

To: Steven Liu <stevenliu@psdc.com>
Subject: Re: Could not find the source code for "/sbin/init".
From: Pete Popov <ppopov@pacbell.net>
Date: Tue, 14 Aug 2001 11:37:56 -0700
Cc: linux-mips@oss.sgi.com
References: <84CE342693F11946B9F54B18C1AB837B0A2431@ex2k.pcs.psdc.com>
Sender: owner-linux-mips@oss.sgi.com
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.3) Gecko/20010801
Steven Liu wrote:
Hi, Pete:

Thank you very much for your help.

After several tries, I realized that you are right. My MMU may have
problem.

Because my mips CPU is not the standard one and I do not have a R3000
application program such as "date", "arch", or "init", I built an application as
following.

liu.c is:
void main(void)
{

}

Makefile is:

ARCH = mips

.EXPORT_ALL_VARIABLES:


CROSS_COMPILE   =mips-linux-

AS      =$(CROSS_COMPILE)as
LD      =$(CROSS_COMPILE)ld
CC =$(CROSS_COMPILE)gcc -D__mips__ CPP =$(CC) -E
AR      =$(CROSS_COMPILE)ar
NM      =$(CROSS_COMPILE)nm
STRIP   =$(CROSS_COMPILE)strip
OBJCOPY =$(CROSS_COMPILE)objcopy
OBJDUMP =$(CROSS_COMPILE)objdump
MAKE    =make
GENKSYMS=/sbin/genksyms


CFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -mips1
-mcpu=r3000 -mmemcpy

CFLAGS += $(shell if $(CC) -fno-strict-aliasing -S -o /dev/null -xc
/dev/null >/dev/null 2>&1; then echo "-fno-strict-aliasing"; fi)

# egcs-1.0.2 compiler for MIPS has a problem for which this is a
work-around
CFLAGS += $(shell if $(CC) -mno-split-addresses -S -o /dev/null -xc
/dev/null >/dev/null 2>&1; then echo "-mno-split-addresses"; fi)



.S.s:
        $(CC) -D__ASSEMBLY__  -traditional -E -o $*.s $<
.S.o:
        $(CC) -D__ASSEMBLY__  -traditional -c -o $*.o $<



liu: $(CONFIGURATION) liu.o
        $(LD) $(LINKFLAGS) $(HEAD) liu.o  \
                -o liu
        $(NM) liu | grep -v '\(compiled\)\|\(\.o$$\)\|\( [aU]
\)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' | sort > System.map


liu.o: liu.c $(CC) $(CFLAGS) $(PROFILING) -c -o $*.o $<


When I ran the program, it crushed.

Could you build this application and run it on your R3000 system? If it
works, send me your executable so that I can test my system.

How do you run the program? Do you use it instead of /sbin/init? If so, what should happen is that the program should "run" and then just return. If you put printks before and after your program is run, you should see the program being executed and then returning. If it's crashing, it sounds like your kernel can't run *any* userland app, probably because the mmu is not setup correctly.

Unfortunately I don't have any R3000 based boards so I can't test anything.

Pete



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