openbmc Digest, Vol 32, Issue 32

[Wang, Haiyue]

Hi Andrew,

I thought it just needed a memory map function for some special
SoC registers. I truly learn more from this security design. :)

Thanks.

BR,
Haiyue


On 2018-04-13 08:30, Andrew Jeffery wrote:
> Hi Haiyue,
>
> On Thu, 12 Apr 2018, at 17:25, Wang, Haiyue wrote:
>> Hi Andrew,
>>
>> Facebook uses the 'devmem' utility and python script to implement the
>> soc register
>>
>> read and write in a simple way. And the yocto layer is also very clear
>> like different
>>
>> chip vendor and common parts.
>>
>>
>> Kernel device tree upstream is also very slow, we needs two parts
>> (device tree + user app)
>>
>> to finish the soc setting. But Facebook just uses user app, this
>> development is fast, and
>>
>> simple is the best.
>>
>>
>> Well, just for sharing what I found, I may misunderstood the BIG idea
>> after this kernel
>>
>> patch design. :-)
> Ben's covered the main points, but yes, what was implicit was we're looking to improve the security of the BMC. I'll try to make sure I'm more explicit in the future.
>
> Cheers,
>
> Andrew