@Rogue

Maybe you could also add some code to initialize the IO base addresses of the ACPI controller, hardware monitoring block and SMBus host controller. I had hardware monitoring working (fan speed, some voltages) a long time ago. It would be interesting to know, if it can be made working again, if the initialization is done in U-boot.
The ACPI controller's base address has to be set anyway to fully powerup the VIA southbridge. One of my PCs with a VIA southbridge sets the following base address:

0x4000 ACPI
0x6000 hardware monitoring
0x5000 SMBus host controller

@kgrach
Thanks for the infos!

Last edited by Geri on 30-Sep-2008 at 10:45 PM.

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A1SE: G3@600MHz, 2GB, 1GBit network card
A1XE: G4@933MHz, 2GB, refitted AC'97 codec
microA1: G3@800MHz, 1GB

- A1 Linux support -

After reading this thread my friend with the microA1 built a power pack to use as a RTC battery alternative and also set about measuring the current drawn. He found that it was something like 10x higher than expected which prompted him to examine his motherboard very closely. There is a small component on the underside of his board labeled U26 that has blown out and he believes this is the source of his microA1 woes.

So, where to from here?

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@peroxidechicken

That appears to be a single AND gate, and is used by the LAN circuitry.
This gate combines the 10 and 100 activity signals together, which then drives Q6, which will draw current through the bi-color LED in the ethernet jack.

The way it's wired, this LED is one color for 10-100, or another color for 1000. This is in case the board is populated with a realtek RTL8110 (gigabit ethernet) but a side note says we probably just have the RTL8100 (10/100) ethernet chip.

In any case, if U26 is damaged, it can draw too much current, but the circuit it serves appears to be just an LED driver, so if it still works, I wouldn't worry.
Since U26 is powered from the regular +3.3 volt supply, I don't think it should affect the battery circuit. But then, weirder things have happened.

LyleHaze

Last edited by lylehaze on 12-Oct-2008 at 02:03 AM.

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