Hello. On 07/29/2014 02:08 AM, Hauke Mehrtens wrote:
The address prefix 00:90:4C is used by Broadcom in their initial configuration. When a mac address with the prefix 00:90:4C is used all devices from the same series are sharing the same mac address. To prevent mac address collisions we replace them with a mac address based on the base address. To generate such addresses we take the main mac address from et0macaddr and increase it by two for the first wifi device and by 3 for the second one. This matches the printed mac address on the device. The main mac address increased by one is used as wan address by the vendor code.
Signed-off-by: Hauke Mehrtens <hauke@xxxxxxxxxx> ---
v1: fix checkpatch warnings
arch/mips/bcm47xx/sprom.c | 48 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+)
diff --git a/arch/mips/bcm47xx/sprom.c b/arch/mips/bcm47xx/sprom.c index da4cdb1..41226b6 100644 --- a/arch/mips/bcm47xx/sprom.c +++ b/arch/mips/bcm47xx/sprom.c
[...]
@@ -648,6 +677,25 @@ static void bcm47xx_fill_sprom_ethernet(struct ssb_sprom *sprom, nvram_read_macaddr(prefix, "macaddr", sprom->il0mac, fallback); nvram_read_macaddr(prefix, "il0macaddr", sprom->il0mac, fallback); + + /* The address prefix 00:90:4C is used by Broadcom in their initial + configuration. When a mac address with the prefix 00:90:4C is used + all devices from the same series are sharing the same mac address. + To prevent mac address collisions we replace them with a mac address + based on the base address. */
The preferred multi-line comment style in the kernel is this: /* * bla * bla */ WBR, Sergei
