Any chance you can try 2.4.21-pre4 (latest linux-mips) before we go any further? Pete On Tue, 2003-06-17 at 11:12, Joseph Chiu wrote: > (Sorry for the double-send of the original inquiry to the list -- I actually > got bounce notices from my mailer...) > > This is the kernel from almost a year ago with the changes you made to > support the 36-bit phys addr. access on the Au1xxx. > The Au1x00 PCMCIA (CS release 3.1.22) initialization maps phys_mem f80000000 > to virt_io c0000000. > > I am running HostAP (0.0.3) on top of this PCMCIA support, using a > Prism3-based WiFi card. > > During transmit/receive activity, the hardware interrupt invokes the > prism2_interrupt() in hostap_cs.o which, in turn reads and writes from > registers using the virtual i/o address of c0000000. > > Under light and moderate loading, there are no problems. After heavy > traffic loads, the system eventually dies with accesses to address c000xxxx > (one address gets hit 95% of the time - and there were other addresses a few > other times, but always in the c000xxxx address range). > > Thanks, > Joseph > > -----Original Message----- > From: Pete Popov [mailto:ppopov@mvista.com] > Sent: Tuesday, June 17, 2003 10:19 AM > To: Joseph Chiu > Cc: Linux MIPS mailing list > Subject: Re: wired tlb entry? > > > On Mon, 2003-06-16 at 17:36, Joseph Chiu wrote: > > Hi, > > Is there a (proper) way to add a page entry in the TLB it's always valid? > > Specifically, accesses to memory-mapped hardware (PCMCIA) causes the > kernel > > to oops under heavy interrupt loading. > > It seems to me that the page entry in the TLB is getting flushed out under > > the activity; and when the ioremap'd memory region is accesses, the > > exception handling for the missing translation does not run. > > > > I'm afraid my two days of googling hasn't turned up the right information. > > I think I just don't know the right terminology and I hope someone can at > > least point me in the right direction. > > Thanks. > > Joseph > > (I am running 2.4.18-mips) > > So is this a kernel from linux-mips.org? Are you using the 36 bit I/O > patch in that kernel, or the pseudo-address translation hack that I > removed later? What pcmcia I/O card are you using and what tests are you > running? > > Pete > > >
