MIPS: BCM63XX: provide a MAC address for BCM3368 chips

The BCM3368 SoC uses a NVRAM format which is not compatible with the one
used by CFE, provide a default MAC address which is suitable for use and
which is the default one also being used by the bootloader on these
chips.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: cernekee@gmail.com
Cc: jogo@openwrt.org
Patchwork: https://patchwork.linux-mips.org/patch/5498/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/mips/bcm63xx/nvram.c b/arch/mips/bcm63xx/nvram.c
index a4b8864f9307..e652e578a679 100644
--- a/arch/mips/bcm63xx/nvram.c
+++ b/arch/mips/bcm63xx/nvram.c
@@ -42,6 +42,7 @@ void __init bcm63xx_nvram_init(void *addr)
 {
         unsigned int check_len;
         u32 crc, expected_crc;
+        u8 hcs_mac_addr[ETH_ALEN] = { 0x00, 0x10, 0x18, 0xff, 0xff, 0xff };
 
         /* extract nvram data */
         memcpy(&nvram, addr, sizeof(nvram));
@@ -62,6 +63,15 @@ void __init bcm63xx_nvram_init(void *addr)
         if (crc != expected_crc)
                 pr_warn("nvram checksum failed, contents may be invalid (expected %08x, got %08x)\n",
                         expected_crc, crc);
+
+        /* Cable modems have a different NVRAM which is embedded in the eCos
+         * firmware and not easily extractible, give at least a MAC address
+         * pool.
+         */
+        if (BCMCPU_IS_3368()) {
+                memcpy(nvram.mac_addr_base, hcs_mac_addr, ETH_ALEN);
+                nvram.mac_addr_count = 2;
+        }
 }
 
 u8 *bcm63xx_nvram_get_name(void)