[U-Boot] [PATCH V3 4/5] ARM: OMAP4/5: Change the default boot command to work with device tree

[Sricharan R]

On Wednesday 27 March 2013 09:15 PM, Tom Rini wrote:
> On Tue, Mar 26, 2013 at 09:57:35AM +0530, Sricharan R wrote:
> 
>> Now with kernel moving to all device tree, the default
>> boot command is changed to pass the device tree blob.
>> Also, adding the findfdt command to get the dt-blob
>> based on the board.
> [snip]
>> @@ -153,7 +155,9 @@
>>  	"mmcargs=setenv bootargs console=${console} " \
>>  		"vram=${vram} " \
>>  		"root=${mmcroot} " \
>> -		"rootfstype=${mmcrootfstype}\0" \
>> +		"rootfstype=${mmcrootfstype}; " \
>> +		"run findfdt; " \
>> +		"fatload mmc ${mmcdev} ${fdtaddr} ${fdtfile}\0" \
> 
> I missed this part before, sorry.  What we do on am335x_evm to allow
> for easier overrides is:
> - bootcmd runs findfdt (since we'll need it in all cases).
> - Enable CONFIG_CMD_FS_GENERIC
> - Add a 'loadfdt' command that can be called out ala loaduimage
> - Use 'load' in loadfdt/loaduimage so that we don't care what the
>   underlying filesystem type is.
> - Use bootdir to help with overrides as well:
> loaduimage=load mmc ${bootpart} ${loadaddr} ${bootdir}/${bootfile}
> loadfdt=load mmc ${bootpart} ${fdtaddr} ${bootdir}/${fdtfile}
> 
> So that we can easily grab from the first partition (FAT) or another
> partition (ext3/4/etc).
> 
 Yeah, liked this. Thanks for detailed explanation. Will add this
 then for better.

Regards,
 Sricharan