On 04/10/2017 08:57 AM, Olliver Schinagl wrote:
Hey York,
On 10-04-17 17:52, York Sun wrote:
On 04/10/2017 08:34 AM, Olliver Schinagl wrote:
First off:
P.S. Joe, for some reason my previous patches where added with me as:
"oli...@schinagl.nl <oli...@schinagl.nl>" I see that it comes from
patchwork
as such. Is there some way to fix this to
"Olliver Schinagl <oli...@schinagl.nl>"?
Below the updated summary:
This patch-series introduces methods to retrieve the MAC address from an
onboard EEPROM. The series does a few small cleanups at the start, as
either
I ran into them while doing this series and fixed them along the way or
actually depended on them.
A manufacturer wants to produce boards and may even have MAC addresses
for
boards. Maintaining unique environments on a per-board basis however is
horrible. Also this data should be very persistent, and not easily
deletable
by simply wiping the environment or device tree. Finally there are
chips available on the market with a pre-programmed MAC address chips
(proms)
that a board manufacturer wants to use. Because of this, the MAC needs
to be
stored be able to read from such an 'external' source.
The current idea of the eeprom layout, is to skip the first 8 bytes,
so that
other information can be stored there if needed, for example a header
with some magic to identify the EEPROM. Or equivalent purposes.
After those 8 bytes the MAC address follows the first macaddress. The
macaddress is appended by a CRC8 byte and then padded to make for nice
8 bytes.
Following the first macaddress one can store a second, or a third etc etc
macaddress.
The CRC8 is optional (via a define) but is strongly recommended to
have. It
helps preventing user error and more importantly, checks if the bytes
read are actually a user inserted address. E.g. only writing 1
macaddress into
the eeprom but trying to consume 2.
Interesting solution. We have used EEPROM to store board ID, version
number, MAC addresses on many of our boards. We have a command "mac" to
read/write these addresses. Would you take a look to see if it is
possible to integrate?
I feel bad for not noticing the mac command! I think that this indeed
could get integrated, providing generic helpers.
Just wished you would have sent your suggestion during patch v1 or v2 :p
Sorry, for some reason I wasn't CC'ed for your earlier version. They
were buried in thousands of emails.
York
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