[coreboot] Conventions for describing flash memory layouts

[Sam Kuper]

On 18/03/2017, Patrick 'P. J.' McDermott <pj at pehjota.net> wrote:
> On 2017-03-18 at 18:00, Sam Kuper wrote:
>> The page
>> https://www.coreboot.org/index.php?title=Board:lenovo/x201&oldid=24709#Flashing
>> says:
>>
>> > The flash memory in the X201 is divided into roughly 4 parts:
>> >
>> > - Descriptor (12K)
>> > - ME firmware (5M-12K)
>> > - Rewriteable flash (3M-96K)
>> > - Locked bootblock (96K)
>>
>> I guess that "K" refers to kibibytes and that "M" refers to mebibytes.
>
> Correct.
>
>> I also guess that the values in parentheses refer to the sizes of the
>> corresponding occupants of the flash memory, with the "-" symbol
>> representing "minus". This was not my first guess, but is the one that
>> seems to make the most sense.
>
> I'm not familiar with Ibex Peak's standard flash layout, but this sounds
> correct.  The 12-KiB "Descriptor" should contain both the Intel Flash
> Descriptor and the Gigabit Ethernet Region.  And the region sizes by
> that math add up to 8 MiB, which sounds right.

Many thanks for corroborating!