According to the thread https://forum.openwrt.org/viewtopic.php?id=48281
b53 uses GPIO 7:
[    4.470000] b53_common: [DBG] b53_switch_reset_gpio using 7
and causes device to self-reboot. GPIO 8 was found in CFE boot log:
"Reset switch via GPIO 8 ..."

Signed-off-by: Rafał Miłecki <[email protected]>
---
 target/linux/generic/files/drivers/net/phy/b53/b53_priv.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/target/linux/generic/files/drivers/net/phy/b53/b53_priv.h 
b/target/linux/generic/files/drivers/net/phy/b53/b53_priv.h
index ce5b530..d28e118 100644
--- a/target/linux/generic/files/drivers/net/phy/b53/b53_priv.h
+++ b/target/linux/generic/files/drivers/net/phy/b53/b53_priv.h
@@ -308,6 +308,8 @@ static inline int b53_switch_get_reset_gpio(struct 
b53_device *dev)
        enum bcm47xx_board board = bcm47xx_board_get();
 
        switch (board) {
+       case BCM47XX_BOARD_LINKSYS_WRT300NV11:
+               return 8;
        case BCM47XX_BOARD_LINKSYS_WRT310NV1:
                return 8;
        default:
-- 
1.8.4.5
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