dear jun, do you have the patch to fix "non-coherent MIPS cache"? thanks in advanced!:) and thanks you all who reply to this so quickly:) btw, i don't mean usb not function with linux mips kernel i mean using the "hotplug"-usb support(http://linux-hotplug.sourceforge.net/?selected=usb) with linux mips kernel for example, after we plug in usb cable with a mips board, the mips kernel try to execute "/sbin/hotplug" shell script, then kernel wait_for_complete() for "/sbin/hotplug" with spin_lock_irq(), the do_execve() of "/sbin/hotplug" return 0(successfully), however, wait_for_complete() never return, then kernel is reseted by hardware watchdog(timeout 3 secs) we already trace this problem over a month, but still can't figure out is it a userland problem(cross-compiler/shell(bash)) or a problem with linux mips kernel best regards, ----- Original Message ----- From: "Jun Sun" <jsun@mvista.com> To: "Ralf Baechle" <ralf@linux-mips.org> Cc: "??" <kevin@gv.com.tw>; <linux-mips@linux-mips.org>; <jsun@mvista.com> Sent: Wednesday, November 20, 2002 1:54 AM Subject: Re: usb hotplug function with linux mips kernel > On Tue, Nov 19, 2002 at 01:29:22PM +0100, Ralf Baechle wrote: > > Hello double questionmark ;-) > > > > On Tue, Nov 19, 2002 at 08:09:07PM +0800, ?? wrote: > > > > > anyone successfully using usb hotplug function with linux mips kernel? > > > > > > http://marc.theaimsgroup.com/?l=linux-hotplug-devel&m=102954820511328&w=2 > > > > There is nothing in the USB code that should be MIPS specific. Despite > > what Tom suspects everything is fine. 32-bit kernel symbols always start > > with 0xffffffff and the value of usbdevfs_cleanup is an artefact of the > > function having been discarded by the linker. > > > > Additional info: > > USB has been working on MIPS for well over a year now. There was a problem > early on due to non-coherent MIPS cache, but it was solved back then. > > We have been using USB on global span IVR successfully. Maybe there are > still some patches missing in linux-mips tree. I will take a look later. > > Jun
