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From: Brian Campbell <brianc@pobox.com>
Subject: skc0: no PHY found
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>On Sun, 2005-02-20 at 18:07 +0000, Bjoern A. Zeeb wrote:
>> On Sun, 20 Feb 2005, Markus Trippelsdorf wrote:
>> > My build in ethernet card (ASUS A8V mobo) does not work.
>> > (I've tried HEAD, RELENG_5 and RELENG_5_3):
>>
>> Could you please apply the patch at [1] and mail me the results.
>
>OK here is the relevant part of dmesg:
>
>skc0: <Marvell Gigabit Ethernet> port 0xb000-0xb0ff mem
>0xfbc00000-0xfbc03fff irq 17 at device 10.0 on pci0
>skc0: Reserved 0x4000 bytes for rid 0x10 type 3 at 0xfbc00000
>skc0: Yukon Gigabit Ethernet 10/100/1000Base-T Adapter
>skc0: PN: Yukon 88E8001
>skc0: EC: Rev. 1.3
>skc0: MN: Marvell
>skc0: SN: AbCdEfG334454
>skc0: type = YUKON
>skc0: SK_EPROM0 = 0x10
>skc0: SRAM size = 0x010000
>skc0: chip ver  0xb1
>skc0: chip conf 0x73
>sk0: <Marvell Semiconductor, Inc. Yukon> on skc0
>sk0: Ethernet address: 00:11:2f:88:07:42
>sk0: [/usr/src/sys/dev/mii/mii.c:mii_phy_probe:342] ENXIO
>skc0: no PHY found! 6
>device_attach: sk0 attach returned 6

I'm running 4.7 and had the same problem ... my fix was, in
sk_init_yukon(), just after sc is assigned, add:

    sk_win_write_4(sc, SK_GPIO,
        (sk_win_read_4(sc, SK_GPIO) | SK_GPIO_DIR9) & ~SK_GPIO_DAT9);