Linux/TMDXSK437X: Kernel modules build issue

Oleksiy Danikhno

Part Number: TMDXSK437X

Tool/software: Linux

How to correctly rebuild loadable kernel modules with "Enable stack unwinding support" ?

When kernel and modules are built with debug info and "Enable stack unwinding support" config option,
the modules are failed to boot: "disagrees about version of symbol module_layout"

ti-processor-sdk-linux-am437x-evm-04.03.00.05
am437x-sk-evm

Boot log:
===========================================
...
[FAILED] Failed to start Load Kernel Modules.
See 'systemctl status systemd-modules-load.service' for details.
[ OK ] Started Remount Root and Kernel File Systems.
...
[   11.018150] remoteproc: disagrees about version of symbol module_layout
[   11.042719] omap_wdt: disagrees about version of symbol module_layout
...
[   11.556268] snd_soc_tlv320aic3x: disagrees about version of symbol module_layout
[   12.202015] am437x_vpfe: disagrees about version of symbol module_layout
[   12.219460] am437x_vpfe: disagrees about version of symbol module_layout
...

Insmod:
===========================================
root@am437x-evm:~# insmod /lib/modules/4.9.69-g9ce43c71ae/kernel/drivers/media/platform/am437x/am437x-vpfe.ko
[ 1522.165787] am437x_vpfe: disagrees about version of symbol module_layout
insmod: ERROR: could not insert module /lib/modules/4.9.69-g9ce43c71ae/kernel/drivers/media/platform/am437x/am437x-vpfe.ko: Invalid module format

Modinfo:
===========================================
root@am437x-evm:~# modinfo /lib/modules/4.9.69-g9ce43c71ae/kernel/drivers/media/platform/am437x/am437x-vpfe.ko
filename:       /lib/modules/4.9.69-g9ce43c71ae/kernel/drivers/media/platform/am437x/am437x-vpfe.ko
version:        0.1.0
license:        GPL
description:    TI AM437x VPFE driver
author:         Texas Instruments
srcversion:     068F2F1D15C039784AD1932
alias:          of:N*T*Cti,am437x-vpfeC*
alias:          of:N*T*Cti,am437x-vpfe
depends:
intree:         Y
vermagic:       4.9.69-g9ce43c71ae preempt mod_unload modversions ARMv7 p2v8
parm:           debug:Debug level 0-8 (int)

Objdump:
===========================================
root@am437x-evm:~# objdump -i /lib/modules/4.9.69-g9ce43c71ae/kernel/drivers/media/platform/am437x/am437x-vpfe.ko
BFD header file version (GNU Binutils) 2.27.0.20160806
elf32-littlearm
(header little endian, data little endian)
arm
elf32-bigarm
(header big endian, data big endian)
arm
elf32-little
(header little endian, data little endian)
plugin
arm
elf32-big
(header big endian, data big endian)
plugin
arm
plugin
(header little endian, data little endian)
srec
(header endianness unknown, data endianness unknown)
plugin
arm
symbolsrec
(header endianness unknown, data endianness unknown)
plugin
arm
verilog
(header endianness unknown, data endianness unknown)
plugin
arm
tekhex
(header endianness unknown, data endianness unknown)
plugin
arm
binary
(header endianness unknown, data endianness unknown)
plugin
arm
ihex
(header endianness unknown, data endianness unknown)
plugin
arm

               elf32-littlearm elf32-bigarm elf32-little elf32-big plugin srec
        plugin --------------- ------------ elf32-little elf32-big ------ srec
           arm elf32-littlearm elf32-bigarm elf32-little elf32-big ------ srec

               symbolsrec verilog tekhex binary ihex
        plugin symbolsrec verilog tekhex binary ihex
           arm symbolsrec verilog tekhex binary ihex

Built with "Enable stack unwinding support" in cofig:
===================================================
export PATH=$PATH:/home/od/ti/ti-processor-sdk-linux-am437x-evm-04.03.00.05/linux-devkit/sysroots/x86_64-arago-linux/usr/bin
export ARCH=arm
export CROSS_COMPILE=arm-linux-gnueabihf-
export INSTALL_MOD_PATH=/home/od/ti/ti-processor-sdk-linux-am437x-evm-04.03.00.05/targetNFS
make mrproper
make am437x-evm_debug_defconfig
echo "=================================zImage===================================="
make zImage
cp arch/arm/boot/zImage ../../targetNFS/boot/
echo "=================================modules==================================="
make modules
make modules_install

over 5 years ago

0 Kemal R. Shakir over 5 years ago

TI__Guru 55345 points

Hello Oleksiy,

Please, do it in this way.

1) Clean.
make linux_clean

2) Backup your defconfig file
cp board-support/linux-<version>/arch/arm/configs/tisdk_am437x-evm_defconfig board-support/linux-<version>/arch/arm/configs/tisdk_am437x-evm_defconfig.bak

3) Load default config.
cd board-support/linux-<version>/
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- tisdk_am437x-evm_defconfig

4) Config in Menuconfig and enable the needed options, unwinding support in your case.

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- menuconfig

Kernel hacking ---> [*] Enable stack unwinding support

5) Replace the old defconfig file with the new one which includes unwinding support.
cd ../../
cp board-support/linux-<version>/.config board-support/linux-<version>/arch/arm/configs/tisdk_am437x-evm_defconfig

6) Compile and install the dtb, linux and modules.
make linux
make linux_install

7) Compile and install the ti-sgx-ddk-km modules.
make ti-sgx-ddk-km
make ti-sgx-ddk-km_install

8) Copy the needed dtb, kernel and modules in a proper places at your SD card.

sudo cp -r targetNFS/boot/ /media/<username>/rootfs/
sudo cp -r targetNFS/lib/modules/ /media/<username>/rootfs/lib/

Best regards,
Kemal

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Linux/TMDXSK437X: Kernel modules build issue