[U-Boot] [swupdate] Re: SWUpdate - U-Boot environment library dependency

[Simon Goldschmidt]

On 21.11.2018 16:48, Simon Goldschmidt wrote:
> On 21.11.2018 16:41, Wolfgang Denk wrote:
>> Dear Simon,
>>
>> In message <CAAh8qsyopV-HftdCWMbMu+fdcpqWWQtBnZDDyqFyv6iC1eoCDA at mail.gmail.com> you wrote:
>>>> Only if you use signed images.  With plain U-Boot, there is not even
>>>> a checksum for it...
>>> When SPL loads U-Boot from a legacy image, isn't there a CRC involved over
>>> the full image including the environment?
>> Yes, but when - for example - the compiled in default environment
>> gets corrupted while loading from the storage device or while
>> writing it to RAM, there will be zero check when reading it.
> Hmm, on my board, SPL loads U-Boot from NOR to SDRAM, then checks the
> uimage CRC. I'd say this is enough checks. That might not hold for all
> boards though.

Oops, I'll have to take that back. I just checked and SPL *does* boot 
the uImage U-Boot also if I deliberately corrupt the CRC of the image. 
So you're right, it seems to be not protected at all!

Is that expected behaviour or a bug?


Simon