Hello Warner. This is what i get on the console before it hangs. == sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0 sio0: type 16550A sio1 at port 0x2f8-0x2ff irq 3 on isa0 sio1: type 16550A sio4: <3Com MegaHertz 3CCFEM556B> at port 0x120-0x127 irq 11 function 1 config 3 9 on pccard1 sio4: type 16550A with a buggy IIR_TXRDY implementation sio4: unable to activate interrupt in fast mode - using normal mode sio4 : spouting nonsense -- disabled. == Is it possible that somehow the IRQ supposed for the ep0 is somehow getting into the sio4 handler ? dheeraj PS: The machine still hangs because it still gets into that offending while loop. -----Original Message----- From: "M. Warner Losh" <imp_at_bsdimp.com> To: dhee_at_myrealbox.com Date: Sat, 27 Dec 2003 10:04:17 -0700 (MST) Subject: Re: Serial driver problems with 5.2-current In message: <1072530641.b36949c0dhee_at_myrealbox.com> "Dheeraj" <dhee_at_myrealbox.com> writes: : Hello Warner. : : I got a little further ahead or maybe not. : i just put in a bunch of printf's and noticed that it goes into an infinite loop. in : : srs/sys/dev/sio.c : : siointr1(struct com_s com) : { : : in the 2nd while loop : while(line_status & LSR_RCV_MASK) { : /*break/unattached error bits or real input?*/ : ---- : --- : } : } : so it never comes out of this loop and the machine just hangs. i : could also point to some more details if i were able to see the : 'printfs' properly, right now i can see the scrreen scroll so fast : that i can't make anything out of it. and as i said earlier i cannot : break into the debugger. (i know only two ways of it, ctrl-alt-esc : and sysctl, if there is anything else i can try out i shall try) Very interesting. You are attaching to a uart that potentially isn't there for reasons unknown. Not sure which interrupt is involved (we should make a ddb command show active interrupts). Please try this patch and report back what it says. WarnerReceived on Sat Dec 27 2003 - 11:50:13 UTC
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