[PATCH v7 3/7] ARM: tegra: add SoC UID calculation function

[Svyatoslav Ryhel]

23 червня 2023 р. 14:24:37 GMT+03:00, Thierry Reding <thierry.reding at gmail.com> написав(-ла):
>On Fri, Jun 23, 2023 at 08:55:56AM +0300, Svyatoslav Ryhel wrote:
>> This is a small tool for calculation of SoC UID based on the same
>> Linux function. It can be further used for generation of device
>> unique data like mac address or exposing it as serial number.
>
>It's a very bad idea to use the SoC UID as a MAC address. There are
>better ways (such as MAC address randomization) to generate one if for
>some reason you don't have a real MAC address or are concerned about
>privacy.

SoC UID is not used directly as MAC but it is used as a device specific base to generate device specific one. You can check LG board to see what I mean.

>The SoC UID is also not very well suited as a serial number because it
>identifies only the SoC, but doesn't say anything about any of the other
>components of a device. Many devices have serial numbers in some EEPROM
>chip, so those would be more appropriate.

That is not the case of devices in patches and IIRC SoC UID is used as fastboot ID on transformers by vendor.

>I suppose not all devices have such a system-wide serial number, so
>perhaps there are cases where this would be better than nothing.

Vendors usually do not expose serial in any device hardware, or at least do not bother to inform, where to find it.

>Thierry