问题
I am having trouble placing firmware properly on an Android device, I keep getting:
<3>[ 3590.997375] usb 3-1.4: ath9k_htc: Firmware - htc_7010.fw not found
If on a standard linux machine running Ubuntu, I place htc_7010.fw in /lib/firmware then I do not get this error.
However, if I place this firmware in /lib/firmware on Android, I still get the error. I have tried all of the following directories and still receive the error:
/lib/firmware
/etc/firmware
/system/lib/modules
/system/lib/firmware
/system/etc
No such luck... what dictates where the firmware should be, and how could I determine which directories it is scanning for the firmware?
回答1:
On Android (ICS anyways) it has its own daemon/service (or whatever you want to call it) to manage hotplug events, including firmware requests. In <android>/system/core/init/devices.c, there are two #defines that specify locations where firmware will be checked:
#define FIRMWARE_DIR1 "/etc/firmware"
#define FIRMWARE_DIR2 "/vendor/firmware"
On my initial build of the ICS filesystem, /etc/firmware didn't exist (and the etc directory seems to be a symbolic link created at boot/init time). The directory I had to place firmware in on my NFS mounted rootfs was <mount point>/system/etc/firmware
After doing this, request_firmware() calls from my module successfully completed.
回答2:
I had a similar problem with my firmware named : down3.bin
(Beforehand, I had insert my module "io_ti.ko" with # insmod of course)
When I plugged my device (USB-RS232 converter, Digi International EdgeportTI1 port adapter) on my Android tablet (Samsung Galaxy Tab 2), he was unable to find his firmware in "linux android adapted directories".
So, like you, I tried to put my "down3.bin" in:
/lib/firmware
/etc/firmware
/system/lib/modules
/system/lib/firmware
/system/etc
with :# dmesg I still had error :
<6>[00000.00000] io_ti 1-1:1.0 : Edgeport TI 1 port adapter converter detected <6>[00000.00000] Failed to load image "edgeport/down3.bin" err-2 <6>[00000.00000] io_ti:probe of 1-1:1.0 failed with error -5
err -2 = [ENOENT] = No such file or directory.
In fact, like you mentionned :
In
<android>/system/core/init/devices.c, there are two#defines that specify locations where firmware will be checked:#define FIRMWARE_DIR1 "/etc/firmware" #define FIRMWARE_DIR2 "/vendor/firmware"
- So you have to put your firmware in one of these directories. It worked properly for me, hopefully.
回答3:
The kernel executes a user-space script to load the firmware. Check if you have the script on the right location.
- Check the which location the kernel looks for the script. / # cat /proc/sys/kernel/hotplug. The default location is "/sbin/hotplug".
- Check if you have the script, the kernel is looking for, in this location. On android the script should be "/system/busybox/sbin/mdev", so you can set "/proc/sys/kernel/hotplug" to this, if it is not.
来源：https://stackoverflow.com/questions/6019915/kernel-module-cannot-find-firmware-file-on-android-device-where-should-it-be