On Fri, 12 Sep 2003, Jeremy Katz wrote:
> On Fri, 2003-09-12 at 12:58, Brian Long wrote:
> > We have a large problem determining which NICS in a multiple-NIC machine
> > will come up as eth0 for kickstart to proceed?
>
> It's all based off of the kernel's scan order. Which is basically PCI
> scan order but when you start throwing ACPI in, it can change I believe.
I just realized Brian was asking about doing this for kickstart, and not
as a normal part of the installer. That's a little trickier, but you
still can reorder the way that devices are detected and potentially "pin"
certain devices to come up earlier than others. Maybe have a
"deviceorder" tag in the ks file which looks like:
'deviceorder foo.o,bar.o'
Here's a fairly simple device detection routine which I added to iutil.py
which uses lspci. It just builds up a hash of pci entries based on what
is detected in the machine. It needs a little bit of work (it would be
more efficient to not re-read the pcitable every time the function is
run), but it illustrates how to do it.
def getDevices(pciclass = None):
# load the pci table
if(os.path.isfile('/modules/pcitable')):
fn = '/modules/pcitable'
elif(os.path.isfile('pcitable')):
fn = 'pcitable'
elif(os.path.isfile('/usr/share/kudzu/pcitable')):
fn = '/usr/share/kudzu/pcitable'
# search for the pci ids
pat = re.compile(r'^(0x.*?)\s*"(.*?)"\s*"(.*?)"')
f = open(fn, 'r')
lines = f.readlines()
f.close()
# hash whatever we find
pcitable = {}
for l in lines:
pciobj = pat.match(l)
if pciobj:
(pci) = pciobj.group
pcitable[pci(1)] = [pci(2), pci(3)]
# get output from lspci
try:
argv = [ "/sbin/lspci", "-nv" ]
output = os.open("/tmp/devices", os.O_WRONLY | os.O_TRUNC | os.O_CREAT)
execWithRedirect(argv[0], argv, stdout = output)
os.close(output)
except:
try:
argv = [ "/mnt/runtime/usr/sbin/lspci", "-nv" ]
output = os.open("/tmp/devices", os.O_WRONLY | os.O_TRUNC | os.O_CREAT)
execWithRedirect(argv[0], argv, stdout = output)
os.close(output)
except:
log("Couldn't run lspci")
return []
# parse output to find out pci ids
# this could probably be cleaned up a little
f = open("/tmp/devices", 'r')
lines = f.readlines()
f.close()
subvendor = ""
subdevice = ""
subid = ""
skip = 0
pciids = []
for line in lines:
fields = string.split(line)
if line[0] == '\n':
continue
elif line[0] != '\t':
skip = 0
(vendor, device) = string.split(fields[3], ':')
idclass = fields[2]
idclass = idclass[:-1]
#print "* %s:%s" % (pciclass, idclass)
if pciclass and pciclass != idclass:
skip = 1
continue
elif fields[0] == "Subsystem:":
if skip:
continue
(subvendor, subdevice) = string.split(fields[1], ':')
key = "0x%s\t0x%s\t0x%s\t0x%s" % (vendor, device,
subvendor, subdevice)
# search first for the full pci id
if pcitable.has_key(key):
v = pcitable[key]
pciids.append(key, v[0], v[1])
else:
key = "0x%s\t0x%s" % (vendor, device)
if pcitable.has_key(key):
v = pcitable[key]
pciids.append(key, v[0], v[1])
return pciids
