[U-Boot] MII register display

[Jon Smirl]

On Wed, May 6, 2009 at 2:57 PM, Jon Smirl <jonsmirl at gmail.com> wrote:
> Why is "speed selection = 10 Mbps" when both sides support 100Mb?
> Is uboot decoding this register correctly?
>
> uboot> mii dump 0 0
> 0.     (1000)                 -- PHY control register --
>  (8000:0000) 0.15    =     0    reset
>  (4000:0000) 0.14    =     0    loopback
>  (2040:0000) 0. 6,13 =   b00    speed selection = 10 Mbps

This b00 here is confusing. b is a valid hex character, I thought this
was reporting the register value as 0xb00.
Instead it appears to be trying to indicate that the two bits are binary?


>  (1000:1000) 0.12    =     1    A/N enable
>  (0800:0000) 0.11    =     0    power-down
>  (0400:0000) 0.10    =     0    isolate
>  (0200:0000) 0. 9    =     0    restart A/N
>  (0100:0000) 0. 8    =     0    duplex = half
>  (0080:0000) 0. 7    =     0    collision test enable
>  (003f:0000) 0. 5- 0 =     0    (reserved)
>
> Definition from Linux:
>
> /* Basic mode control register. */
> #define BMCR_RESV               0x003f  /* Unused...                   */
> #define BMCR_SPEED1000          0x0040  /* MSB of Speed (1000)         */
> #define BMCR_CTST               0x0080  /* Collision test              */
> #define BMCR_FULLDPLX           0x0100  /* Full duplex                 */
> #define BMCR_ANRESTART          0x0200  /* Auto negotiation restart    */
> #define BMCR_ISOLATE            0x0400  /* Disconnect DP83840 from MII */
> #define BMCR_PDOWN              0x0800  /* Powerdown the DP83840       */
> #define BMCR_ANENABLE           0x1000  /* Enable auto negotiation     */
> #define BMCR_SPEED100           0x2000  /* Select 100Mbps              */
> #define BMCR_LOOPBACK           0x4000  /* TXD loopback bits           */
> #define BMCR_RESET              0x8000  /* Reset the DP83840           */
>
>
>
>
> uboot> mii dump 0 1
> 1.     (786d)                 -- PHY status register --
>  (8000:0000) 1.15    =     0    100BASE-T4 able
>  (4000:4000) 1.14    =     1    100BASE-X  full duplex able
>  (2000:2000) 1.13    =     1    100BASE-X  half duplex able
>  (1000:1000) 1.12    =     1    10 Mbps    full duplex able
>  (0800:0800) 1.11    =     1    10 Mbps    half duplex able
>  (0400:0000) 1.10    =     0    100BASE-T2 full duplex able
>  (0200:0000) 1. 9    =     0    100BASE-T2 half duplex able
>  (0100:0000) 1. 8    =     0    extended status
>  (0080:0000) 1. 7    =     0    (reserved)
>  (0040:0040) 1. 6    =     1    MF preamble suppression
>  (0020:0020) 1. 5    =     1    A/N complete
>  (0010:0000) 1. 4    =     0    remote fault
>  (0008:0008) 1. 3    =     1    A/N able
>  (0004:0004) 1. 2    =     1    link status
>  (0002:0000) 1. 1    =     0    jabber detect
>  (0001:0001) 1. 0    =     1    extended capabilities
>
>
> uboot> mii dump 0 2
> 2.     (0022)                 -- PHY ID 1 register --
>  (ffff:0022) 2.15- 0 =    34    OUI portion
>
>
> uboot> mii dump 0 3
> 3.     (161a)                 -- PHY ID 2 register --
>  (fc00:1400) 3.15-10 =     5    OUI portion
>  (03f0:0210) 3. 9- 4 =    33    manufacturer part number
>  (000f:000a) 3. 3- 0 =    10    manufacturer rev. number
>
>
> uboot> mii dump 0 4
> 4.     (01e1)                 -- Autonegotiation advertisement register --
>  (8000:0000) 4.15    =     0    next page able
>  (4000:0000) 4.14    =     0    reserved
>  (2000:0000) 4.13    =     0    remote fault
>  (1000:0000) 4.12    =     0    reserved
>  (0800:0000) 4.11    =     0    asymmetric pause
>  (0400:0000) 4.10    =     0    pause enable
>  (0200:0000) 4. 9    =     0    100BASE-T4 able
>  (0100:0100) 4. 8    =     1    100BASE-TX full duplex able
>  (0080:0080) 4. 7    =     1    100BASE-TX able
>  (0040:0040) 4. 6    =     1    10BASE-T   full duplex able
>  (0020:0020) 4. 5    =     1    10BASE-T   able
>  (001f:0001) 4. 4- 0 =     1    selector = IEEE 802.3
>
>
> uboot> mii dump 0 5
> 5.     (c5e1)                 -- Autonegotiation partner abilities register --
>  (8000:8000) 5.15    =     1    next page able
>  (4000:4000) 5.14    =     1    acknowledge
>  (2000:0000) 5.13    =     0    remote fault
>  (1000:0000) 5.12    =     0    (reserved)
>  (0800:0000) 5.11    =     0    asymmetric pause able
>  (0400:0400) 5.10    =     1    pause able
>  (0200:0000) 5. 9    =     0    100BASE-T4 able
>  (0100:0100) 5. 8    =     1    100BASE-X full duplex able
>  (0080:0080) 5. 7    =     1    100BASE-TX able
>  (0040:0040) 5. 6    =     1    10BASE-T full duplex able
>  (0020:0020) 5. 5    =     1    10BASE-T able
>  (001f:0001) 5. 4- 0 =     1    selector = IEEE 802.3
>
>
> uboot>
>
>
> --
> Jon Smirl
> jonsmirl at gmail.com
>



-- 
Jon Smirl
jonsmirl at gmail.com