Hi Oliver --
It's really just a serial number. The Allwinner A20 datasheet refers to it
as a root key, later ones such as A83T refer to it as chip ID. U-Boot
uses the same process to generate MAC addresses for all Allwinner boards.
Cheers,
Jared
On Sat, 3 Sep 2016, Oliver Pinter wrote:
Hi!
On 9/3/16, Jared McNeill <jmcne...@freebsd.org> wrote:
Author: jmcneill
Date: Sat Sep 3 15:28:09 2016
New Revision: 305354
URL: https://svnweb.freebsd.org/changeset/base/305354
Log:
Use the root key in the Security ID EFUSE (when valid) to generate a
MAC address instead of creating a random one each boot.
Could you please describe a little more about this root key? What is
it? What's the main purpose? Is is a crypto root key?
Modified:
head/sys/arm/allwinner/if_awg.c
Modified: head/sys/arm/allwinner/if_awg.c
==============================================================================
--- head/sys/arm/allwinner/if_awg.c Sat Sep 3 15:26:28 2016
(r305353)
+++ head/sys/arm/allwinner/if_awg.c Sat Sep 3 15:28:09 2016
(r305354)
@@ -62,6 +62,7 @@ __FBSDID("$FreeBSD$");
#include <dev/ofw/ofw_bus_subr.h>
#include <arm/allwinner/if_awgreg.h>
+#include <arm/allwinner/aw_sid.h>
#include <dev/mii/mii.h>
#include <dev/mii/miivar.h>
@@ -1277,6 +1278,7 @@ awg_get_eaddr(device_t dev, uint8_t *ead
{
struct awg_softc *sc;
uint32_t maclo, machi, rnd;
+ u_char rootkey[16];
sc = device_get_softc(dev);
@@ -1285,9 +1287,19 @@ awg_get_eaddr(device_t dev, uint8_t *ead
if (maclo == 0xffffffff && machi == 0xffff) {
/* MAC address in hardware is invalid, create one */
- rnd = arc4random();
- maclo = 0x00f2 | (rnd & 0xffff0000);
- machi = rnd & 0xffff;
+ if (aw_sid_get_rootkey(rootkey) == 0 &&
+ (rootkey[3] | rootkey[12] | rootkey[13] | rootkey[14] |
+ rootkey[15]) != 0) {
+ /* MAC address is derived from the root key in SID */
+ maclo = (rootkey[13] << 24) | (rootkey[12] << 16) |
+ (rootkey[3] << 8) | 0x02;
+ machi = (rootkey[15] << 8) | rootkey[14];
+ } else {
+ /* Create one */
+ rnd = arc4random();
+ maclo = 0x00f2 | (rnd & 0xffff0000);
+ machi = rnd & 0xffff;
+ }
}
eaddr[0] = maclo & 0xff;
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