On Mar 22, 2005, at 17:27, Jeff Garzik wrote:
+int mii_check_gmii_support(struct mii_if_info *mii)
+{
+ int reg;
+
+ reg = mii->mdio_read(mii->dev, mii->phy_id, MII_BMSR);
+ if (reg & BMSR_HAS_EXTSTAT1000) {
+ reg = mii->mdio_read(mii->dev, mii->phy_id, MII_EXTSTAT1000);
+ if (reg & (ESR_1000_BASE_X_FD | ESR_1000_BASE_T_FD |
+ ESR_1000_BASE_X_HD | ESR_1000_BASE_T_HD))
+ return 1;
+ }
+
+ return 0;
2) Reading a non-existent register will return all 1's in most cases,
so I am not sure if this is the best test.
He reads a standard register (BMSR) to determine whether or not
EXTSTAT1000 exists. This is part of the 802.3 standard, so it should
work.
Andy
Andy Fleming
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