[src/trunk]: src/sys/arch/powerpc/oea Fix boot failure for PowerMac11,2 when ...

[rin <rin%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/19f076a9b370
branches:  trunk
changeset: 1011711:19f076a9b370
user:      rin <rin%NetBSD.org@localhost>
date:      Tue Jul 07 02:10:20 2020 +0000

description:
Fix boot failure for PowerMac11,2 when ``auto-boot?'' is true.

For some machines like PowerMac11,2, Open Firmware does not correctly
initialize console-related variables, like font-adr and line#, when
``auto-boot?'' is true; -1 is returned instead of correct values.

Fall back to wsfont embedded in kernel in this case. Also, do not use
line# if it is negative.

diffstat:

 sys/arch/powerpc/oea/ofw_rascons.c |  23 ++++++++++++++++++-----
 1 files changed, 18 insertions(+), 5 deletions(-)

diffs (59 lines):

diff -r 4e8cfd55544a -r 19f076a9b370 sys/arch/powerpc/oea/ofw_rascons.c
--- a/sys/arch/powerpc/oea/ofw_rascons.c        Tue Jul 07 01:47:47 2020 +0000
+++ b/sys/arch/powerpc/oea/ofw_rascons.c        Tue Jul 07 02:10:20 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ofw_rascons.c,v 1.14 2020/03/16 22:02:37 macallan Exp $        */
+/*     $NetBSD: ofw_rascons.c,v 1.15 2020/07/07 02:10:20 rin Exp $     */
 
 /*
  * Copyright (c) 1995, 1996 Carnegie-Mellon University.
@@ -28,7 +28,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ofw_rascons.c,v 1.14 2020/03/16 22:02:37 macallan Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ofw_rascons.c,v 1.15 2020/07/07 02:10:20 rin Exp $");
 
 #include "wsdisplay.h"
 
@@ -87,6 +87,8 @@
 
        /* get current cursor position */
        OF_interpret("line#", 0, 1, &crow);
+       if (crow < 0)
+               crow = 0;
 
        /* move (rom monitor) cursor to the lowest line - 1 */
        /* XXXX - Why? */
@@ -165,7 +167,11 @@
        if (needs_finalize == 0) return;
 
        /* get current cursor position */
-       if (romfont_loaded) OF_interpret("line#", 0, 1, &crow);
+       if (romfont_loaded) {
+               OF_interpret("line#", 0, 1, &crow);
+               if (crow < 0)
+                       crow = 0;
+       }
 
        ri->ri_ops.allocattr(ri, 0, 0, 0, &defattr);
        wsdisplay_preattach(&rascons_stdscreen, ri, 0, uimax(0,
@@ -179,9 +185,16 @@
        int char_width, char_height, stride;
        int chosen, mmu, m, e, size;
 
-       /* Get ROM FONT address. */
+       /*
+        * Get ROM FONT address.
+        *
+        * For some machines like ``PowerMac11,2'', Open Firmware does not
+        * initialize console-related variables when auto-boot? is true;
+        * -1 is returned instead of correct value. Fall back to wsfont
+        * embedded in kernel in this case.
+        */
        OF_interpret("font-adr", 0, 1, &romfont);
-       if (romfont == NULL)
+       if (romfont == NULL || romfont == (u_char *)-1)
                return -1;
 
        chosen = OF_finddevice("/chosen");