http://hardforum.com/showthread.php?t=1512972
Hier lees ik iets over een probleem met PWRGD configuration jumper, zou dit ook zo zijn met die LSI?
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The HP SAS expander cards obviously seemed to use more than just the power connections from the PCI express connector.
I looked at the HP SAS expander's card edge connector and took some measurements with a Tektronix MSO4104 Mixed Signal Oscilloscope.
I moved the expander card to diffferent slots and repeated my measurements during boot up.
That helped me to figure out what caused the expander cards not to work in the black PCI express slots.
Every PCI express connector has a PWRGD (Power Good) signal on Side A pin 11 (A11).
On the HP SAS expander cards, this signal appears to be connected to the expander's processor (most likely connected to or used as a #RESET signal).
The PWRGD signal in the black and blue PCI express slots are by default low and on the white PCI express slots it goes high (+3.3V) as soon as the motherboard powers up.
During the expansion slot boot process, the CPU queries configuration registers on the expansion cards to determin what kind of card it is and what resources it requires.
If no card is plugged into the black or blue slots, the PWRGD signal is released (goes high) for a short periode of time and returns low if a card does not respond with any data during the query/scan process.
If proper resource data is received by the CPU, it will set the PWRGD signal high for that particular slot.
My guess is that since the HP SAS expander cards don't need any resources from the motherboard other than power,
they don't respond with any data and hence the motherboard figures there is no card in the slot and no need to release the PWRGD signal!
Which in turn puts the HP SAS expander back into a reset state and the expander will not pass any traffic via any of the SAS ports!
I decided to perform a couple of simple tests and used some Kapton tape to cover the PWRGD signal pin on the expander cards edge connector.
Once the PWRGD signal was disconnected from the motherboard (esentially floating), the expander cards processor started working and the drives appeared in the RAID controller's BIOS screen.
So I figured that all I had to do was to simply disconnect the PWRGD signal by cutting the trace just above the A11 pin.
However after a few more measurements, I found that the card does not pull-up this signal.
Now leaving a signal floating is bad enough, leaving a RESET signal floating can be absolutely disastrous!
A simple solution would be to add a pull-up resistor on the card, however that usually does not satisfy a processors power-up reset timing.
A capacitor could be added to control the signal rise time during power up.
However the proper or best way would be to have the PWRGD signal connected to the processor to have a controled reset process.
This would also provide the ability to reset the card without having to power down the entire system.
If a reset is issued by the motherboard, the PWRGD signal is pulled low momentarily to reset the I/O card.
So I had a look at the motherboard to see what I could do to change the behaviour of the PWRGD signal for the two black PCI express slots.
After tracing the signal I found that apparently there are different stuffing options on the Asus P7P55-WS-SC motherboard for the PWRGD signal next to each of the PCI express connectors!
Currently there is a zero ohm jumper resistor that connects the PWRGD pin of each slot to a dedicated (programmable) power good signal.
Right next to each of those resistors is an unpopulated spot for a jumper resistor that would connect the PWRGD pin to a global power good signal.
I verified the operation of the 'global' PWRGD signal with the scope before undertaking the modification.
I figured that all I need to do is move the jumper resistors for those two black PCI express connectors over and I should be good to go.
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kunnen vier schijven in. Disk Array 4SA.:strip_exif()/u/252890/walking.gif?f=community)
(mocht HV hem niet willen 
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Probleem is dat ik geen goede bootschijf heb met drivers voor de Intel SASUC8I 
, komt uit het pentium 4 laptop tijdperk) die ik in combo met een Pico PSU moet kunnen gebruiken?.
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