On Sat, 14 Jun 2014 10:46:37 +0100 Ian Campbell ijc@hellion.org.uk wrote:
On Sat, 2014-06-14 at 08:59 +0200, Hans de Goede wrote:
From: Jonathan Liu net147@gmail.com
Similar to the USB NIC found on OMAP5uEVM, PandaBoard and BeagleBoard-XM boards, the sunxi SoCs have a NIC onboard without an embedded MAC address.
Just like the omap used on these boards, the sunxi SoCs do have a unique chip id, in the form of the 128 bit SID register: http://linux-sunxi.org/SID_Register_Guide
So mimick the BeagleBoard-XM board code (commit 548a64d8) and use the chip id to generate a unique fixed MAC address.
We check for the SID not being all 0, since some early A20 batches shipped without having there SID programmed.
Note we use specific parts of the 128 bits, since some parts indicate the SoC family / revision, and thus are fixed. The algorithm for this was taken from the linux-sunxi.org kernels.
Signed-off-by: Jonathan Liu net147@gmail.com [hdegoede@redhat.com: Expanded the commit message with some more info] Signed-off-by: Hans de Goede hdegoede@redhat.com
Acked-by: Ian Campbell ijc@hellion.org.uk
Acked-by: Siarhei Siamashka siarhei.siamashka@gmail.com