Re: kern/50804: Nouveau console doesn't come up on Dell laptop

[Taylor R Campbell <riastradh%NetBSD.org@localhost>]

The following reply was made to PR kern/50804; it has been noted by GNATS.

From: Taylor R Campbell <riastradh%NetBSD.org@localhost>
To: Roy Bixler <rcbixler%nyx.net@localhost>
Cc: gnats-bugs%NetBSD.org@localhost
Subject: Re: kern/50804: Nouveau console doesn't come up on Dell laptop
Date: Sat, 20 Feb 2016 15:51:17 +0000

    Date: Sat, 20 Feb 2016 08:45:45 -0700
    From: Roy Bixler <rcbixler%nyx.net@localhost>
 
    On Mon, Feb 15, 2016 at 08:41:48PM +0000, Taylor R Campbell wrote:
    > Another change that might be worthwhile to test would be to add
    > 
    > #include <ddb/ddb.h>
    > 
    > 	if (bpa/size covers the nvidia bar)
    > 		db_stack_trace_print(
    > 		    (db_expr_t)(intptr_t)__builtin_frame_address(0),
    > 		    true, 65535, "", printf);
    > 
    > to bus_space_map in sys/arch/x86/x86/bus_space.c, so that you can see
    > who is trying to map this bus space, in case someone else has already
    > mapped it.  (You'll need to fill in what the relevant BAR's address
    > and size actually are, unless you want to increase MSGBUFSIZE and wade
    > through a stack trace for every bus space mapping in the system.)
 
    The thought occurred to me before, so since you agree, I'll give it a
    go.
 
 Since bus_space_map is apparently failing with EAGAIN, that is
 definitely worth a try -- EAGAIN means someone else has already mapped
 some part of the region.