The other thing that isn't right in the bootargs are the unexpanded
variables. If when you printenv you see:
davinci_enc_mngr.ch0_mode=$(videostd)
The $(videostd) is NOT expanded at run time. It's only evaluated when
you set the environment variable. Same with the nfshost & rootpath.
Steve
bj wrote:
> I just went through the pain of trying to figure out how the vpbe
> worked. I'm with Steve on this one though, checkthe simple things
> first. You said you used the THS8200 as your base for your driver.
> Make sure you added everything to Kconfig and adjusted your Makefile
> properly. Also, looking at your bootargs I don't see where 'videostd'
> is defined. Did you leave this at the default? (ntsc or pal).
>
> BJ
>
> Stephen Berry wrote:
>>
>> Probably the only piece of the 355 hardware that I haven't touched is
>> the VPBE...
>>
>> But, if I had to guess - I would double check your console arg in
>> uboot. I recently spent an hour or so debugging a problem that wasn't
>> really there because someone used the letter O, instead of the number
>> 0 in the tty arg. Now I always check this first whenever there are no
>> prints after the kernel loads and doesn't print anything...
>>
>> Steve
>>
>> Prabhaharan R-TLS,Chennai wrote:
>>
>> Hello Stephen and Murali,
>>
>>
>> Currently I am working on the Video encoder driver for Davinci DMS
>> 355. The driver is being implemented using the Montavista TI Linux
>> code. As per the existing encoder driver architecture, we can add
>> the customized new driver to the drivers/media folder and we have
>> set the encoder output name in the driver as well in the boot
>> arguments. I have taken the THS8200_encoder.c as reference. Since,
>> the encoder that I am going to use is through I2c, I have selected
>> the ths8200_encoder.c as base.
>>
>>
>> I have set the encoder output as KCDA210. Also, I have made changes
>> in the davinci_platform.c for VPBE module settings. In the boot
>> arguments, when I give the encoder manager output name as KCDA210,
>> the system is booting and working fine. If, I make any changes in
>> the encoder file that I have created, then the system is not
>> booting. The system gets hanged during the kernel un-compression. If
>> I revert those changes back, then the system is booting properly.
>>
>>
>> For example, err |= i2c_write();
>>
>>
>> If I make the change as err = i2c_write();, instead of ORing the
>> output, then the system gets hanged during the boot.
>>
>>
>> I am not sure that the hanging is because of this change. But, if I
>> revert these changes back, the system works fine.
>>
>>
>> Boot arguments that I am using,
>>
>> *setenv bootargs console=ttyS0,115200n8 noinitrd rw
>> ip=10.100.135.51:10.100.135.126:10.100.135.1:255.255.255.0:::off
>> root=/dev/nfs nfsroot=$(nfshost):$(rootpath),nolock mem=116M
>>
>> video=davincifb:vid0=720x576x16,2500K:vid1=720x576x16,2500K:osd0=720x576x16,2025K
>>
>> davinci_enc_mngr.ch0_output=KCDA210
>> davinci_enc_mngr.ch0_mode=$(videostd)*
>>
>>
>> If you faced the same issue, please provide your valuable comments.
>>
>>
>> Thanks a lot in advance.
>>
>>
>> Regards,
>>
>> Prabha.
>>
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