[U-Boot] Disable command at runtime

[Petr Kubizňák]

Hi Tom, thanks for your reply.

Such way is of course possible, but you surely know I'm rather 
interested in more clever solutions. Besides the understandable fact 
that I don't want to maintain two u-boot variants and flash it twice, I 
also believe it can be useful to lock "almost everything" and unlock it 
once I need, e.g. in case of some troubles.

So any suggestions which would really answer my question, please?


On 07/29/2016 03:31 PM, Tom Rini wrote:
> On Thu, Jul 28, 2016 at 04:40:29AM -0700, kubiznak.petr wrote:
>
>> Hello,
>>
>> I wonder whether it is possible to dynamically enable/disable a command.
>> Since u-boot does not provide any secure authentication method, it is
>> dangerous to keep some commands available to a potential hacker. E.g.
>> the "fuse" command. On the other hand, I need these commands during the
>> manufacturing process. So my idea is to enable/disable the commands
>> dynamically based on some obscure logic. Is there a way to do it without
>> need to deeply hack the code?
> Well, there's a few ways to do this.  The first way would simply be to
> install a different build of U-Boot onto the board than the one used
> during flashing as part of the manufacturing process.
>