ar71xx: Routerboard 751 Mac Address Offset Fix

We utilize many Routerboard 751's and discovered that our latest batch
of RB751's would not initialize the wireless radio. We have determined
Mikrotik has changed where the mac address was located inside hardconfig.
As such we utilize "routerboot_find_tag" to find the location of the mac
address. We should remove "RB751_MAC_ADDRESS_OFFSET" as it is ambiguous
by machine manufacturing date. The newer batch of RB751's that we received
had a RB751_MAC_ADDRESS_OFFSET 0x10.

Signed-off-by: Davey Hutchison <dhutchison@bluemesh.net>
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
SVN-Revision: 35519

diff --git a/target/linux/ar71xx/files/arch/mips/ath79/mach-rb750.c b/target/linux/ar71xx/files/arch/mips/ath79/mach-rb750.c
index 22d1680519c06542282170375b693fc32661dfd5..5656d3c1f17dad24d5033b6a926d03f27479fda9 100644 (file)
--- a/target/linux/ar71xx/files/arch/mips/ath79/mach-rb750.c
+++ b/target/linux/ar71xx/files/arch/mips/ath79/mach-rb750.c
@@ -282,7 +282,6 @@ MIPS_MACHINE(ATH79_MACH_RB_750G_R3, "750Gr3", "MikroTik RouterBOARD 750GL",
 
 #define RB751_HARDCONFIG       0x1f00b000
 #define RB751_HARDCONFIG_SIZE  0x1000
-#define RB751_MAC_ADDRESS_OFFSET 0xE80
 
 static void __init rb751_wlan_setup(void)
 {
@@ -290,6 +289,8 @@ static void __init rb751_wlan_setup(void)
        struct ath9k_platform_data *wmac_data;
        u16 tag_len;
        u8 *tag;
+       u16 mac_len;
+       u8 *mac;
        int err;
 
        wmac_data = ap9x_pci_get_wmac_data(0);
@@ -314,7 +315,14 @@ static void __init rb751_wlan_setup(void)
                return;
        }
 
-       ap91_pci_init(NULL, hardconfig + RB751_MAC_ADDRESS_OFFSET);
+       err = routerboot_find_tag(hardconfig, RB751_HARDCONFIG_SIZE,
+                                 RB_ID_MAC_ADDRESS_PACK, &mac, &mac_len);
+       if (err) {
+               pr_err("rb75x: no mac address found\n");
+               return;
+       }
+
+       ap91_pci_init(NULL, mac);
 }
 
 static void __init rb751_setup(void)