add dyndbg="QUERY" boot parameter using uEnv.txt

I'm using Sitara AM335x 3.8.13 kernel.

OK, now I understood that I have to use optargs, but when I try to enable verbose debugging for the tilcdc_drv, stil does not work.

I use the following "optargs" argunment:

optargs='ddebug_query="file tilcdc_drv.c +p"'

TI only supports Arago 3.2 kernel for AM335x, which does not have the file 'tilcdc_drv.c'.

Here is the few things I would check.

1. Review your tilcdc_drv.c to see if its debug messages use dynamic debug or not;

2. unlikely to happen, but worth to check if your kernel has the env name changed from 'ddebug_query' to something else. In 3.2 kernel, I can see Line 541 in lib/dynamic_debug.c: __setup("ddebug_query=", ddebug_setup_query);

3. check if your uboot supports optargs, if not, you have to directly add this option 'ddebug_query=...' into your bootargs;

4. while debugging this issue, after modified the uboot env and booted the kernel, check if you have the following in /proc/cmdline. If not, you still don't have u-boot env setup correctly.

ddebug_query="file tilcdc_drv.c +p"