[U-Boot] [PATCH] jetson-tk1: Set fdtfile environment variable

[Stephen Warren]

On 04/13/2016 06:55 AM, Andreas Färber wrote:
> Am 13.04.2016 um 14:48 schrieb Andreas Färber:
>> The 4.5.0 kernel cannot cope with U-Boot's internal device tree, and the
>> distro boot commands are looking for $fdtfile, so provide it to avoid
>> having users supply a dumb boot.scr doing a setenv fdtfile ...; boot,
>> defeating the purpose of generic EFI boot.
>>
>> Cc: Stephen Warren <swarren at nvidia.com>
>> Cc: Alexander Graf <agraf at suse.de>
>> Signed-off-by: Andreas Färber <afaerber at suse.de>
>> ---
>>   include/configs/jetson-tk1.h | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/include/configs/jetson-tk1.h b/include/configs/jetson-tk1.h
>> index 59dbb20..82a4be4 100644
>> --- a/include/configs/jetson-tk1.h
>> +++ b/include/configs/jetson-tk1.h
>> @@ -63,6 +63,10 @@
>>   /* General networking support */
>>   #define CONFIG_CMD_DHCP
>>
>> +#define BOARD_EXTRA_ENV_SETTINGS \
>> +	"fdtfile=tegra124-jetson-tk1.dtb\0" \
>> +	""
>
> Is there any more intelligent solution than doing this for each board?

Yes, the distro boot scripts shouldn't be using $fdtfile unconditionally 
since it's not guaranteed to be set. The model is that boot scripts 
determine the FDT filename, and $fdtfile is an optional override.

It looks like the hard-coded use of $fdtfile was added into the EFI 
path, which I didn't get to review, and which shouldn't be enabled by 
default but unfortunately is.