Re: [linux-usb-devel] Quick question regarding USB emulation
[EMAIL PROTECTED] wrote: Hi, David, Thank you so much for your response. I am not quite understand what you mean by It's safe to leave that BIOS feature enabled, unless your BIOS is buggy in that area, since Linux turns it off later if you start up the native USB.. Linux should know how to kick the BIOS off, and AFAIK it does that correctly in all cases with OHCI and EHCI controllers. On the other hand, turn it off if you like. One board's BIOS config docs say the feature is for when you use a usb keyboard or mouse with an operating system that does not ... have any USB drivers instealled, such as DOS and SCO Unix. So Linux clearly shouldn't care how the feature is set. But BIOS bugs do exist, and sometimes even Linux bugs. Does native usb mean the usb driver in linux kernel? If it does, then USB Emulation might not be turned off even when usb drivers have started up. Because I am using RTAI, an real time abstract interface. Its latency test program shows that usb emulation causes large latency. Well, if you isolate some performance problem in a Linux HCD, feel free to write it up and send it along. - Dave Thanks again, jing Quoting David Brownell [EMAIL PROTECTED]: | What is USB emulation? USB emulation is a BIOS option (in some BIOSen) which makes a USB keyboard and mouse look like a PS/2 keyboard and mouse. It is for use when you don't have any USB support in an OS, or won't be booting an OS. Or when you'll be using a USB keyboard when booting, maybe to talk with the BIOS ... It's safe to leave that BIOS feature enabled, unless your BIOS is buggy in that area, since Linux turns it off later if you start up the native USB. - Dave --- This SF.net email is sponsored by: IBM Linux Tutorials. Become an expert in LINUX or just sharpen your skills. Sign up for IBM's Free Linux Tutorials. Learn everything from the bash shell to sys admin. Click now! http://ads.osdn.com/?ad_id=1278alloc_id=3371op=click ___ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
Re: [linux-usb-devel] Quick question regarding USB emulation
Hi, David, Thank you so much for your response. I am not quite understand what you mean by It's safe to leave that BIOS feature enabled, unless your BIOS is buggy in that area, since Linux turns it off later if you start up the native USB.. Does native usb mean the usb driver in linux kernel? If it does, then USB Emulation might not be turned off even when usb drivers have started up. Because I am using RTAI, an real time abstract interface. Its latency test program shows that usb emulation causes large latency. Thanks again, jing Quoting David Brownell [EMAIL PROTECTED]: | What is USB emulation? USB emulation is a BIOS option (in some BIOSen) which makes a USB keyboard and mouse look like a PS/2 keyboard and mouse. It is for use when you don't have any USB support in an OS, or won't be booting an OS. Or when you'll be using a USB keyboard when booting, maybe to talk with the BIOS ... It's safe to leave that BIOS feature enabled, unless your BIOS is buggy in that area, since Linux turns it off later if you start up the native USB. - Dave --- This SF.net email is sponsored by: IBM Linux Tutorials. Become an expert in LINUX or just sharpen your skills. Sign up for IBM's Free Linux Tutorials. Learn everything from the bash shell to sys admin. Click now! http://ads.osdn.com/?ad_id=1278alloc_id=3371op=click ___ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
Re: [linux-usb-devel] Quick question regarding USB emulation
On Fri, 19 Dec 2003 14:45:22 -0700 [EMAIL PROTECTED] wrote: | Hello List, | |How can we use USB device with USB emulation off in BIOS. Our | Configuration is as follows:- | | Red Hat 9.0, Kernel 2.4.20 and RTAI 24.1.11 | | What is USB emulation? USB emulation is a BIOS option (in some BIOSen) which makes a USB keyboard and mouse look like a PS/2 keyboard and mouse. It is for use when you don't have any USB support in an OS, or won't be booting an OS. If you enable USB support in Linux, you can run with USB emulation in BIOS turned off. See the FAQ and USB Guide at http://www.linux-usb.org/ for help on setting up USB in Linux. -- ~Randy MOTD: Always include version info. --- This SF.net email is sponsored by: IBM Linux Tutorials. Become an expert in LINUX or just sharpen your skills. Sign up for IBM's Free Linux Tutorials. Learn everything from the bash shell to sys admin. Click now! http://ads.osdn.com/?ad_id=1278alloc_id=3371op=click ___ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
Re: [linux-usb-devel] Quick question regarding USB emulation
| What is USB emulation? USB emulation is a BIOS option (in some BIOSen) which makes a USB keyboard and mouse look like a PS/2 keyboard and mouse. It is for use when you don't have any USB support in an OS, or won't be booting an OS. Or when you'll be using a USB keyboard when booting, maybe to talk with the BIOS ... It's safe to leave that BIOS feature enabled, unless your BIOS is buggy in that area, since Linux turns it off later if you start up the native USB. - Dave --- This SF.net email is sponsored by: IBM Linux Tutorials. Become an expert in LINUX or just sharpen your skills. Sign up for IBM's Free Linux Tutorials. Learn everything from the bash shell to sys admin. Click now! http://ads.osdn.com/?ad_id=1278alloc_id=3371op=click ___ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
