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Steve Ressler wrote:
> Hi,
>
>>Are you sure that resizer takes major number 254? I guess it uses
>>dynamic number allocation.
>
>
> I believe you are correct, it uses dynamic number allocation. 254 was the
> number
> I saw it using when the device file was created by the init scripts. How can
> I
> find the correct major number? I'm not running the init scripts, so there is
> nothing in /proc to check.
>
> Maybe I should have asked: How can I use the resizer without running the init
> scripts?
>
AFAIK, you cannot check device numbers without proc or sysfs. Some
options coming to mind:
1)
Edit resizer driver drivers/char/davinci_resizer.c Change line:
result = alloc_chrdev_region(&dev, ZERO, 1, DRIVER_NAME);
to:
dev = MKDEV(254_or_some_number_unique_in_the_system, ZERO);
result = register_chrdev_region(dev, 1, DRIVER_NAME);
Don't forget to create node for the number you choose as major.
2)
Create a file in your filesystem and edit, let's say /home/my_init.sh:
#!/bin/sh
mount /proc
RES=$(cat /proc/devices | awk '/davinci_resizer/ {print $1}')
rm -f /dev/resizer
mknod /dev/resizer c $RES 0
/path/to/your/app/app
Then start this script as init, instead of your application.
3)
You can also edit your inittab. Instead of running init scripts you can
just mount some filesystems and then start your application.
I don't use MV fs and kernel, so I can't try these. But I guess they may
give some ideas.
Regards,
Caglar
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