[英]Build linux kernel modules for a special ARM device with Android system
我有一個android設備,其Linux內核在下面。
shell@android:/ # uname -a
uname -a
Linux localhost 3.0.50-g72b01fe #1 SMP PREEMPT Tue Nov 26 14:22:32 CST 2013 armv
7l GNU/Linux
我想為該設備構建一個uvc驅動器模塊。 因此,請在Linux內核3.0.101上構建模塊。 我沒有找到3.0.50版本的內核,所以改用3.0.101。
$ export ARCH=arm
$ export CROSS_COMPILE=arm-linux-gnueabi-
$ build modules
但是我想使用insmod在設備中安裝模塊。 我遇到一個錯誤。
$ insmod /tmp/videobuf2-core.ko
init_module 'videobuf2-core.ko' failed (Exec format error)
因此,我使用modinfo,file和arm-linux-gnueabi-readelf命令來檢查videobuf2_core.ko
$ modinfo videobuf2-core.ko
filename: videobuf2-core.ko
license: GPL
author: Pawel Osciak <pawel@osciak.com>, Marek Szyprowski
description: Driver helper framework for Video for Linux 2
srcversion: 30ECE251825184452C89B09
depends:
vermagic: 3.0.101 mod_unload modversions ARMv5
parm: debug:int
$ file videobuf2-core.ko
videobuf2-core.ko: ELF 32-bit LSB relocatable, ARM, version 1, BuildID[sha1]=0x06240ff3b9f45700086c387fb2b411848ad65fcd, not stripped
$ arm-linux-gnueabi-readelf -a videobuf2-core.ko | head
ELF Header:
Magic: 7f 45 4c 46 01 01 01 61 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: ARM
ABI Version: 0
Type: REL (Relocatable file)
Machine: ARM
Version: 0x1
但是我在設備dhd.ko中找到了一個正常的模塊,有關dhd.ko的信息如下
$ modinfo dhd.ko
filename: dhd.ko
license: GPL v2
depends:
vermagic: 3.0.50-g72b01fe SMP preempt mod_unload modversions ARMv7
$ file dhd.ko
dhd.ko: ELF 32-bit LSB relocatable, ARM, version 1 (SYSV), BuildID[sha1]=0x2db993479965068d38e108b675a8315aa0965f5f, not stripped
$ arm-linux-gnueabi-readelf -a dhd.ko | head
ELF Header:
Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: REL (Relocatable file)
Machine: ARM
Version: 0x1
通過比較兩個文件。 我發現有一些差異。
vermagic:
videobuf2-core.ko which is built by me
3.0.101 mod_unload modversions ARMv5
dhd.ko which is normal module in the device
3.0.50-g72b01fe SMP preempt mod_unload modversions ARMv7
ELF info
videobuf2-core.ko which is built by me
ELF 32-bit LSB relocatable, ARM, version 1, BuildID[sha1]=0x06240ff3b9f45700086c387fb2b411848ad65fcd, not stripped
dhd.ko which is normal module in the device
ELF 32-bit LSB relocatable, ARM, version 1 (SYSV), BuildID[sha1]=0x2db993479965068d38e108b675a8315aa0965f5f, not stripped
OS/ABI
videobuf2-core.ko which is built by me
ARM
dhd.ko which is normal module in the device
UNIX - System V
如何配置以構建Linux內核模塊,使我的videobuf2-core.ko與普通模塊dhd.ko類似? 而且我可以使用insmod命令將我的模塊安裝在設備中。
在這種情況下,最簡單的方法可能是使用3.0.101 Linux版本運行android。 您確定針對此ARM體系結構(armv5與armv7)具有正確的工具鏈(gcc)嗎?
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