On Mon, 2013-11-18 at 18:05 +0100, Giuseppe Pagano wrote: > > > > > > + ksz9031_phy_extended_write(phydev, 0x02, > > > + MII_KSZ9031_EXT_RGMII_CLOCK_SKEW, > > > + MII_KSZ9031_MOD_DATA_NO_POST_INC, 0x03FF); > > > I have september 2012 revision of KSZ9031's manual, and I think it is > complete enough about skew parameter (preliminary version was not). > Default value for GTX_CLK and RX_CLK swek register is 0x001ef (0 ns > delay for both). I use maximum positive delay (value 0x03ff) as safe > value, but it doesn't work on every board.
To be more clear (for people who do not have KSZ9031 manual). GTX and RX skew delay have 5 bit resolution, so MII_KSZ9031_EXT_RGMII_CLOCK_SKEW register have this default value bit: reserved GTX skew RX skew 0000_00----01_111-----0_1111 (0x01EF -> 0ns delay) 0000_00----00_000-----0_0000 (0x0000 -> -0.96ns delay both) 0000_00----11_111-----1_1111 (0x03FF -> +0.96ns delay both) 0000_00----11_111-----0_1111 (0x03EF -> +0.96ns delay only for GTX) etc. > > Best regards > Giuseppe Pagano _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
