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Code Issues Releases Activity

Try not to engage to ATA channels that are disabled by the BIOS.

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This commit is contained in:
Søren Schmidt 2001-03-19 13:31:58 +00:00
parent 8360efbd6c
commit f74abb9b6e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=74463
1 changed files with 5 additions and 0 deletions
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5
sys/dev/ata/ata-pci.c
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@ -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)) {