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Determine speed from clock by formula

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Rather than use a lookup table (which requires maintenance),
implement the formula used to calculate the speed.  This further
makes it a bit more robust in the face of minor timing tweaks
that might change the clock a megahertz up or down.

Change-Id: I6336bdc07af361a31b5a51698d0231d876791f16
This commit is contained in:
Jarrod Johnson
2016-03-27 09:00:18 -04:00
parent 8d41ce6331
commit 09367b3f0a
1 changed files with 5 additions and 12 deletions
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17
pyghmi/ipmi/private/spd.py
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@@ -677,16 +677,9 @@ ddr3_bus_width = {
3: 64,
}
speed_by_clock = {
800: 6400,
1066: 8500,
1333: 10600,
1600: 12800,
1867: 14900,
2132: 17000,
2133: 17000,
2134: 17000,
}
def speed_from_clock(clock):
return int(clock * 8 - (clock * 8 % 100))
def decode_manufacturer(index, mfg):
@@ -731,7 +724,7 @@ class SPD(object):
fineoffset = (finetime * fineoffset) * 10**-3
mtb = spd[10] / float(spd[11])
clock = 2 // ((mtb * spd[12] + fineoffset)*10**-3)
self.info['speed'] = speed_by_clock.get(clock, 'Unknown')
self.info['speed'] = speed_from_clock(clock)
self.info['ecc'] = (spd[8] & 0b11000) != 0
self.info['module_type'] = module_types.get(spd[3] & 0xf, 'Unknown')
sdramcap = ddr3_module_capacity[spd[4] & 0xf]
@@ -753,7 +746,7 @@ class SPD(object):
if fineoffset & 0b10000000:
fineoffset = 0 - ((fineoffset ^ 0xff) + 1)
clock = 2 // ((0.125 * spd[18] + fineoffset * 0.001) * 0.001)
self.info['speed'] = speed_by_clock.get(clock, 'Unknown')
self.info['speed'] = speed_from_clock(clock)
else:
self.info['speed'] = 'Unknown'
self.info['ecc'] = (spd[13] & 0b11000) == 0b1000