[RFC PATCH 2/5] OMAP2+: add cpu id register to MAC address helper
From: arnd@arndb.de (Arnd Bergmann)
Date: 2011-03-18 08:35:05
Also in:
linux-omap, lkml
On Saturday 12 March 2011, Andy Green wrote:
quoted hunk ↗ jump to hunk
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 <redacted> --- 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? Maybe we can ask TI to officially request a MAC address range for OMAP SoCs and document an official procedure to compute it. Arnd