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1. Help: Kernel Panic:VFS: Unable to mount root, after rebuilding kernel

I get the followint message when trying to load a new kernel :

Kernel Panic:VFS: Unable to mount root.

This happens, exactly when it should say : "partitionc check hda1 hda2 hda3"

I have checked with rdev and the new kernel does have the rigth
root device (/dev/hda3). If I change this to /dev/hda1, which is my DOS
partition I get : root mounted MSDOS is read only, should be read/write
and the system hangs.

I have played with rootflag in the zImage setting it to 1 (it was 0 originnaly)
and I saw it was 1 in /vmlinuz but that did not change anything.

Moreover the new kernel is about half the size of the old :

-rw-r--r--   1 root     root       121348 Apr  2 13:43 /usr/src/linux/zImage
-r--------   1 root     root       281092 Apr  1 21:43 /vmlinuz

Finally, when I first chose SYSVIPC, when configuring it (I don't know
what it is) it would not compile :

make[1]: Entering directory `/usr/src/linux/ipc'
gcc -D__KERNEL__ -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -pipe -m486
-c util.c
gcc -D__KERNEL__ -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -pipe -m486
-c msg.c
gcc -D__KERNEL__ -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -pipe -m486
-c sem.c
gcc -D__KERNEL__ -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -pipe -m486
-c shm.c
ld -r -o ipc.o util.o  msg.o sem.o shm.o
util.o: Definition of symbol _shm_fork (multiply defined)
util.o: Definition of symbol _sem_exit (multiply defined)
util.o: Definition of symbol _shm_exit (multiply defined)
util.o: Definition of symbol _shm_swap (multiply defined)
util.o: Definition of symbol _shm_no_page (multiply defined)
sem.o: Definition of symbol _sem_exit (multiply defined)
shm.o: Definition of symbol _shm_exit (multiply defined)
shm.o: Definition of symbol _shm_fork (multiply defined)
shm.o: Definition of symbol _shm_no_page (multiply defined)
shm.o: Definition of symbol _shm_swap (multiply def

I recompiled with disabling sysvipc

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