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imx8: get mac address from OTP rom

--- a/sys/src/9/imx8/etherimx.c

+++ b/sys/src/9/imx8/etherimx.c

@@ -655,18 +655,22 @@

 static int

 reset(Ether *edev)

 {

-	Ctlr *ctlr = edev->ctlr;

-	u32int paddr1, paddr2;

+	enum {

+		OCOTP_HW_OCOTP_MAC_ADDR0 = 0x640/4,

+		OCOTP_HW_OCOTP_MAC_ADDR1 = 0x650/4,

+	};

+	static u32int *ocotp = (u32int*)(VIRTIO + 0x350000);

+	u32int a0, a1;

-	/* steal mac address from uboot */

-	paddr1 = rr(ctlr, ENET_PALR);

-	paddr2 = rr(ctlr, ENET_PAUR);

-	edev->ea[0] = paddr1>>24;

-	edev->ea[1] = paddr1>>16;

-	edev->ea[2] = paddr1>>8;

-	edev->ea[3] = paddr1>>0;

-	edev->ea[4] = paddr2>>24;

-	edev->ea[5] = paddr2>>16;

+	a0 = ocotp[OCOTP_HW_OCOTP_MAC_ADDR0];

+	a1 = ocotp[OCOTP_HW_OCOTP_MAC_ADDR1];

+

+	edev->ea[0] = a1>>8;

+	edev->ea[1] = a1>>0;

+	edev->ea[2] = a0>>24;

+	edev->ea[3] = a0>>16;

+	edev->ea[4] = a0>>8;

+	edev->ea[5] = a0>>0;

 	shutdown(edev);