From f74abb9b6e332f32005a7f8c108f7292b35d5452 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=B8ren=20Schmidt?= <sos@FreeBSD.org>
Date: Mon, 19 Mar 2001 13:31:58 +0000
Subject: [PATCH] Try not to engage to ATA channels that are disabled by the
 BIOS.

---
 sys/dev/ata/ata-pci.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sys/dev/ata/ata-pci.c b/sys/dev/ata/ata-pci.c
index 280c476b7d9b..4968fd948cea 100644
--- a/sys/dev/ata/ata-pci.c
+++ b/sys/dev/ata/ata-pci.c
@@ -245,6 +245,11 @@ ata_pci_attach(device_t dev)
     subclass = pci_get_subclass(dev);
     cmd = pci_read_config(dev, PCIR_COMMAND, 4);
 
+    if (!(cmd & PCIM_CMD_PORTEN)) {
+	device_printf(dev, "ATA channel disabled by BIOS\n");
+	return 0;
+    }
+
     /* is busmastering supported ? */
     if ((cmd & (PCIM_CMD_PORTEN | PCIM_CMD_BUSMASTEREN)) == 
 	(PCIM_CMD_PORTEN | PCIM_CMD_BUSMASTEREN)) {