U-Boot failure

gistfile1.txt

=> mii info
"Synchronous Abort" handler, esr 0x96000044, far 0xda8775c50000004b
elr: 000000004a03a3cc lr : 000000004a03a3a4 (reloc)
elr: 00000000bff723cc lr : 00000000bff723a4
x0 : da8775c500000003 x1 : 0000000000000031
x2 : 0000000000000003 x3 : 0000000000000003
x4 : 00000000bff72384 x5 : 00000000bbf1d250
x6 : 0000000000000069 x7 : 00000000bbf26000
x8 : 0000000000000000 x9 : 00000000ffffffd0
x10: 000000000000000d x11: 0000000000000006
x12: 00000000bbf12558 x13: 00000000bbf126c0
x14: 0000000000000002 x15: 00000000bbf12124
x16: 00000000bff4f084 x17: 0000000000000000
x18: 00000000bbf17e00 x19: 0000000000020000
x20: 0000000000000030 x21: 0000000000000003
x22: 00000000bbf1d250 x23: 00000000bffbd9e6
x24: 0000000000000000 x25: 0000000000000000
x26: 0000000000000000 x27: 0000000000000000
x28: 00000000bbf24c20 x29: 00000000bbf12270

Code: 32000021 d5033fbf 91408013 f9481e60 (b9004801) 
Resetting CPU ...
---
(gdb) list *0x4a03a3cc
0x4a03a3cc is in sun8i_mdio_read (drivers/net/sun8i_emac.c:203).
198                     mii_cmd |= MDIO_CMD_MII_CLK_CSR_DIV_128 <<
199                                MDIO_CMD_MII_CLK_CSR_SHIFT;
200
201             mii_cmd |= MDIO_CMD_MII_BUSY;
202
203             writel(mii_cmd, priv->mac_reg + EMAC_MII_CMD);
204
205             ret = wait_for_bit_le32(priv->mac_reg + EMAC_MII_CMD,
206                                     MDIO_CMD_MII_BUSY, false,
207                                     CFG_MDIO_TIMEOUT, true);
---
		emac: ethernet@5020000 {
			compatible = "allwinner,sun50i-a64-emac";
			syscon = <&syscon>;
			reg = <0x05020000 0x10000>;
			interrupts = <GIC_SPI 14 IRQ_TYPE_LEVEL_HIGH>;
			interrupt-names = "macirq";
			resets = <&ccu RST_BUS_EMAC>;
			reset-names = "stmmaceth";
			clocks = <&ccu CLK_BUS_EMAC>;
			clock-names = "stmmaceth";
			status = "disabled";

			mdio: mdio {
				compatible = "snps,dwmac-mdio";
				#address-cells = <1>;
				#size-cells = <0>;
			};
		};