It seems there's a big difference between my current project
>> and u-boot common usage. I can only enjoy the patch myself now
>>
>> i want to get a packet from usb/network, then redirect it to can bus.
>> So blocked write/read of can is not allowed.
>>     
>
> what's wrong with receiving data over usb/network into external memory, then 
> transferring it over CAN ?  this is typically how things are done -- load an 
> file over the network and once it is complete, operate on it (write it to 
> flash, boot it, whatever).
> -mike
>   

It seems a good method, especially when we download a file from computer.
But i'm afraid u-boot doesn't support upload well.
Basically I agree blocked CAN read/write can fulfill my requirement, 
even though it's not so flexible as what i wished.
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