https://community.intel.com/t5/Graphics/ehci-controller-handoff/m-p/233502#M3902 <P>Dear sir,</P><P>&nbsp;</P>When I write EHCI driver for my small OS, I encountered a problem. When cold booting up from a USB disk2.0, the EHCI handoff fails because that both OS-owner bit and the BIOS-owner bit are set already. The HCCPARAMS value is 0x1010001. But it will be OK at warm boot up and I can operate USB disk at about 3.4M/s data rate. If I don't handle this and use its 4 companions, all is OK. The machine is good and Windows Xp can boot normally. Why does this happen and how could I survive from this situation. Thank you for advance.<P>The chipset is Intel (R ) 82801G(ICH7 Family)</P><P>&nbsp;</P>CPU is Intel (R ) Pentium(R ) Dual E2160 @1.8GHz<P>What about other chips?</P><P> </P> Tue, 07 Dec 2010 02:18:30 GMT idata 2010-12-07T02:18:30Z https://community.intel.com/t5/Graphics/ehci-controller-handoff/m-p/233502#M3902 <P>Dear sir,</P><P>&nbsp;</P>When I write EHCI driver for my small OS, I encountered a problem. When cold booting up from a USB disk2.0, the EHCI handoff fails because that both OS-owner bit and the BIOS-owner bit are set already. The HCCPARAMS value is 0x1010001. But it will be OK at warm boot up and I can operate USB disk at about 3.4M/s data rate. If I don't handle this and use its 4 companions, all is OK. The machine is good and Windows Xp can boot normally. Why does this happen and how could I survive from this situation. Thank you for advance.<P>The chipset is Intel (R ) 82801G(ICH7 Family)</P><P>&nbsp;</P>CPU is Intel (R ) Pentium(R ) Dual E2160 @1.8GHz<P>What about other chips?</P><P> </P> Tue, 07 Dec 2010 02:18:30 GMT https://community.intel.com/t5/Graphics/ehci-controller-handoff/m-p/233502#M3902 idata 2010-12-07T02:18:30Z