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Fail to modprobe cmem module when kernel bootup in dm368-evm

Hu James
Prodigy 220 points

In my kenel boot up logs:

------------------------------------------------

INIT: version 2.86 booting
Please wait: booting...
Starting udev
udev: starting version 141
Remounting root file system...
Caching udev devnodes
Populating dev cachemv: cannot rename '/tmp/devices': No such file or directory
ALSA: Restoring mixer settings...
NOT configuring network interfaces: / is an NFS mount
hwclock: can't open '/dev/misc/rtc': No such file or directory
Fri Mar 25 00:10:00 UTC 2011
hwclock: can't open '/dev/misc/rtc': No such file or directory
INIT: Entering runlevel: 5
Starting system message bus: dbus.
Starting telnet daemon.
Starting syslogd/klogd: done
Starting thttpd.
FATAL: Module cmemk not found.
FATAL: Module irqk not found.
FATAL: Module edmak not found.
FATAL: Module dm365mmap not found.
BusyBox v1.13.2 (2011-03-24 18:58:44 CDT) multi-call binary

Usage: mknod [OPTIONS] NAME TYPE MAJOR MINOR

Create a special file (block, character, or pipe)

Options:
-m Create the special file using the specified mode (default a=rw)
TYPEs include:
b: Make a block device
c or u: Make a character device
p: Make a named pipe (MAJOR and MINOR are ignored)

------------------------------------------------

I can see those modules located in "/lib/modules/2.6.32.17-davinci1-g77319a0-dirty/kernel/drivers/dsp/"

-----------------------------------------------------

root@dm368-evm:~# ls -l /lib/modules/2.6.32.17-davinci1-g77319a0-dirty/kernel/drivers/dsp/
-rwxr-xr-x 1 root root 26334 Apr 26 2012 cmemk.ko
-rwxr-xr-x 1 root root 6560 Apr 26 2012 dm365mmap.ko
-rwxr-xr-x 1 root root 9657 Apr 26 2012 edmak.ko
-rwxr-xr-x 1 root root 9483 Apr 26 2012 irqk.ko

------------------------------------------------------

 If i check details of "/lib/modules/2.6.32.17-davinci1-g77319a0-dirty", they are like below

------------------------------------------------------

root@dm368-evm:~# ls -l /lib/modules/2.6.32.17-davinci1-g77319a0-dirty
lrwxrwxrwx 1 root root 78 Apr 23 2012 build -> /home/davinci/ti-dvsdk_dm368-evm_4_02_00_06/psp/linux-2.6.32.17-psp03.01.01.39
drwxr-xr-x 6 root root 4096 Apr 23 2012 kernel
-rw-r--r-- 1 root root 45 Apr 26 2012 modules.alias
-rw-r--r-- 1 root root 3359 Apr 23 2012 modules.alias.bin
-rw-r--r-- 1 root root 69 Apr 26 2012 modules.ccwmap
-rw-r--r-- 1 root root 0 Apr 26 2012 modules.dep
-rw-r--r-- 1 root root 4341 Apr 23 2012 modules.dep.bin
-rw-r--r-- 1 root root 73 Apr 26 2012 modules.ieee1394map
-rw-r--r-- 1 root root 141 Apr 26 2012 modules.inputmap
-rw-r--r-- 1 root root 81 Apr 26 2012 modules.isapnpmap
-rw-r--r-- 1 root root 74 Apr 26 2012 modules.ofmap
-rw-r--r-- 1 root root 1702 Apr 23 2012 modules.order
-rw-r--r-- 1 root root 99 Apr 26 2012 modules.pcimap
-rw-r--r-- 1 root root 43 Apr 26 2012 modules.seriomap
-rw-r--r-- 1 root root 49 Apr 26 2012 modules.symbols
-rw-r--r-- 1 root root 5349 Apr 23 2012 modules.symbols.bin
-rw-r--r-- 1 root root 189 Apr 26 2012 modules.usbmap
lrwxrwxrwx 1 root root 78 Apr 23 2012 source -> /home/davinci/ti-dvsdk_dm368-evm_4_02_00_06/psp/linux-2.6.32.17-psp03.01.01.39
root@dm368-evm:~#

-------------------------------------------------

If i try to find the module location, the result like below:

------------------------------------------------

root@dm368-evm:~# depmod /lib/modules/`uname -r`/modules.dep
WARNING: Module /lib/modules/2.6.32.17-davinci1-g77319a0-dirty/modules.dep is not an elf object
root@dm368-evm:~#

-------------------------------------------------

content of "/etc/init.d/modutils.sh" is like below:

------------------------------------------------

root@dm368-evm:~# cat /etc/init.d/modutils.sh
#!/bin/sh

LOAD_MODULE=modprobe
[ -e /sbin/modprobe ] || LOAD_MODULE=insmod

if [ -e /sbin/depmod -a ! -f /lib/modules/`uname -r`/modules.dep ]; then
[ "$VERBOSE" != no ] && echo "Calculating module dependencies ..."
depmod -Ae
fi

if [ -f /proc/modules ]; then
if [ -f /etc/modules ]; then
[ "$VERBOSE" != no ] && echo -n "Loading modules: "
while read module args
do
case "$module" in
\#*|"") continue ;;
esac
[ "$VERBOSE" != no ] && echo -n "$module "
eval "$LOAD_MODULE $module $args >/dev/null 2>&1"
done < /etc/modules
[ "$VERBOSE" != no ] && echo
fi
fi

: exit 0

--------------------------------------------------

Could you help on this ?

BTW: nothing printed after "modprobe -l"

Regards,

James

  • 0
    Guru 26430 points

    Not sure if the "depmod filename" is what you intended. Maybe try "depmod -a" to rebuild the modules.dep file.

  • 0 in reply to Norman Wong
    Prodigy 220 points

    I search the command for "depmod", it seems kernel Makefile is to run the command:

    [linux-devkit]:~/ti-dvsdk_dm368-evm_4_02_00_06/psp/linux-2.6.32.17-psp03.01.01.39> vim Makefile

    ------------------------------------------

    # Run depmod only if we have System.map and depmod is executable
    quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
    cmd_depmod = \
    if [ -r System.map -a -x $(DEPMOD) ]; then \
    $(DEPMOD) -ae -F System.map \
    $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
    $(KERNELRELEASE); \
    fi

    -----------------------------------------

    Is that to say, kernel Makefile does not work well to depmod/install modules ?

    You can see the size of module.des is zero.

    -----------------------------------------------

    davinci@ubuntu:~/targetfs/lib/modules/2.6.32.17-davinci1-g77319a0-dirty$ ls -l modules.dep
    -rw-r--r-- 1 root root 0 2012-04-26 23:09 modules.dep

    -----------------------------------------------

    Could some one can help on this ?

  • 0 in reply to Hu James
    Guru 26430 points

    I don't think a cross-platform depmod exists on the host. Not with TI's toolchain. You have to "depmod -a" on the target.

  • 0 in reply to Norman Wong
    Prodigy 220 points

    Hi Wong,

    It works as you told.

    After i run command "depmod -a" in the target, new modules.dep of "/lib/modules/2.6.32.17-davinci1-g77319a0-dirty/modules.dep" is created, and it works with "modprobe "

    But i still could not understand why TI DVSDK build environment could not create target's "/lib/modules/2.6.32.17-davinci1-g77319a0-dirty/modules.dep" ?

    In theory,  it built out any resource which "depmod -a" requested in its DVSDK build environment for the target.

  • 0 in reply to Hu James
    Guru 26430 points

    I am not expert in the module.dep file format. I agree that it should be be platform independent but it appears not. As such, a cross-platform version of depmod is required. Similiar to the need for a cross-compiler. Google about for "cross depmod" and there are some hits that would suggest there is one for a non-TI platform. Somebody did think about it. The lack of a cross-depmod in the toolchain is a real hindrance to building a complete target filesystem on the host. You have to have a working target to finish the filesystem and then save the filesytem for production.