diff options
Diffstat (limited to 'sys/arch')
| -rw-r--r-- | sys/arch/sgi/gio/gio.c | 32 |
1 files changed, 30 insertions, 2 deletions
diff --git a/sys/arch/sgi/gio/gio.c b/sys/arch/sgi/gio/gio.c index 7f4faf506ae..77341e1d170 100644 --- a/sys/arch/sgi/gio/gio.c +++ b/sys/arch/sgi/gio/gio.c @@ -1,4 +1,4 @@ -/* $OpenBSD: gio.c,v 1.15 2013/04/21 17:13:36 miod Exp $ */ +/* $OpenBSD: gio.c,v 1.16 2013/09/28 14:03:13 miod Exp $ */ /* $NetBSD: gio.c,v 1.32 2011/07/01 18:53:46 dyoung Exp $ */ /* @@ -371,7 +371,7 @@ gio_id(vaddr_t va, paddr_t pa, int maybe_gfx) } /* - * GIO32 devices with a 32-bit ID register will not necesserily + * GIO32 devices with a 32-bit ID register will not necessarily * answer to addresses not aligned on 32 bit boundaries. */ @@ -403,6 +403,34 @@ gio_id(vaddr_t va, paddr_t pa, int maybe_gfx) */ if (maybe_gfx) { + /* + * On (at least) Indy systems with newport graphics, the + * presence of a SCSI Expansion board (030-8133) in either + * slot will cause extra bits to be set in the topmost byte + * of the 32-bit access to the pipelined slot (i.e. the + * value of id32 is 0x18000004, not 0x00000004). + * + * This would prevent newport from being recognized + * properly. + * + * This behaviour seems to be specific to the SCSI board, + * since the E++ board does not trigger it. This would + * rule out an HPC1.x-specific cause. + * + * We work around this by ignoring the topmost byte of id32 + * from this point on, but it's ugly and isaish... + * + * Note that this is not necessary on Indigo 2 since this + * troublesome board can not be installed on such a system. + * Indigo are probably safe from this issues, for they can't + * use newport graphics; but the issue at hand might be + * HPC 1.x related, so better play safe. + */ + if (sys_config.system_type == SGI_IP20 || + (sys_config.system_type == SGI_IP22 && + sys_config.system_subtype != IP22_INDIGO2)) + id32 &= ~0xff000000; + if (id32 != 4 || id16 != 2 || id8 != 1) { if (guarded_read_4(va + HQ2_MYSTERY, &mystery) == 0 && mystery == HQ2_MYSTERY_VALUE) |