> -----Original Message----- > From: linux-omap-owner@xxxxxxxxxxxxxxx > [mailto:linux-omap-owner@xxxxxxxxxxxxxxx] On Behalf Of Arnd Bergmann > Sent: Friday, March 18, 2011 2:05 PM > To: Andy Green > Cc: linux-kernel@xxxxxxxxxxxxxxx; linux-usb@xxxxxxxxxxxxxxx; > linux-omap@xxxxxxxxxxxxxxx; > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; patches@xxxxxxxxxx; Andy Green > Subject: Re: [RFC PATCH 2/5] OMAP2+: add cpu id register to > MAC address helper > > On Saturday 12 March 2011, Andy Green wrote: > > Introduce a generic helper function that can set a MAC address using > > data from the OMAP unqiue CPU ID register. > > > > Signed-off-by: Andy Green <andy.green@xxxxxxxxxx> > > --- > > > > arch/arm/mach-omap2/id.c | 13 +++++++++++++ > > arch/arm/mach-omap2/include/mach/id.h | 1 + > > 2 files changed, 14 insertions(+), 0 deletions(-) > > > > diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c > > index 5f9086c..fc69ec5 100644 > > --- a/arch/arm/mach-omap2/id.c > > +++ b/arch/arm/mach-omap2/id.c > > @@ -506,3 +506,16 @@ void __init > omap2_set_globals_tap(struct omap_globals *omap2_globals) > > else > > tap_prod_id = 0x0208; > > } > > + > > + > > +void omap2_die_id_to_mac(u8 *mac, int length) > > +{ > > + struct omap_die_id odi; > > + > > + omap_get_die_id(&odi); > > + memcpy(mac, &odi.id_0, length); > > + > > + /* mark it as not multicast and outside official > 80211 MAC namespace */ > > + > > + mac[0] = (mac[0] & ~1) | 2; > > +} > > This is a pretty clever trick, but it's not an official > globally unique MAC > address, right? [sp] This 'trick' has been tried earlier in u-boot. See: http://www.mail-archive.com/u-boot@xxxxxxxxxxxxx/msg19915.html I am also not sure whether DIE_ID would really be unique. ~sanjeev > Maybe we can ask TI to officially request a > MAC address range > for OMAP SoCs and document an official procedure to compute it. > > Arnd > -- > To unsubscribe from this list: send the line "unsubscribe > linux-omap" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
