Re: [PATCH v2 1/3] Revert "mtd: spi-nor: remove Fujitsu MB85RS1MT support"

[Chris Packham]

On 02/07/2026 14:41, Takahiro.Kuwano@xxxxxxxxxxxx wrote:
> Hi Ronan,
>   
>> Hi Takahiro,
>>
>> On Wed, 2026-07-01 at 09:49 +0000, Takahiro.Kuwano@xxxxxxxxxxxx wrote:
>>> I didn't mean any kernel features, but we can dump tmpfs contents
>>> from/to FRAM chip (exposed as NVMEM device) by 'dd'. Doesn't it meet
>>> your system's requirement?
>> Do you mean something like creating a tmpfs and then say, using `tar`
>> and copying the data to nvmem with dd and restoring this data at boot?
> Yes, I meant something like that (sorry, my comment was still not clear).
> Hope that's worth considering.

It won't quite work. Because we have requirements involving ensuring 
when a file is erased it is gone ASAP (i.e. shred). It's all a bit of 
security theater because in reality the safest thing would be to keep 
such secrets in a TPM or protected with a key stored in a TPM.