[coreboot] alix2c3 LEDs and mode switch

[Marc Jones]

 --
http://marcjstuff.blogspot.com/



----- Original Message ----
> From: Roman Yeryomin <leroi.lists at gmail.com>
> To: Marc Jones <marcj303 at yahoo.com>
> Cc: coreboot at coreboot.org
> Sent: Saturday, November 8, 2008 9:25:54 AM
> Subject: Re: [coreboot] alix2c3 LEDs and mode switch
> 
> On Fri, Nov 7, 2008 at 11:47 PM, Marc Jones wrote:
> >> On Fri, Nov 7, 2008 at 8:47 PM, Marc Jones wrote:
> >> > I think I came into this discussion late with getting my email switched 
> over.
> >> > What are you trying to accomplish and where/what do you want to control the
> >> LED from?
> >>
> >> There is fully functional linux kernel driver (see attachment) which
> >> works flawlessly with tinybios (alix factory bios).
> >> I want to indicate software status events (for example network is up
> >> or down) using custom scripts and driver I've mentioned.
> >
> >
> >>#define ALIX_LED1_PORT        (0x6100)
> >
> > The scripts and driver should get the GPIO IO address from the 5536 PCI cfg 
> header instead of hard coding the address.
> > coreboot can allocate the GPIO space to any address. A quick try could be made 
> by checking lspci.
> > GPIO is BAR1 (offset 0x14) in the 5536.
> 
> hmm.. I din't think the address could change. So is it this? wrong
> address? Here is my lspci

> 00:0f.0 ISA bridge: Advanced Micro Devices [AMD] CS5536 [Geode
> companion] ISA (rev 03)
>         Subsystem: Advanced Micro Devices [AMD] CS5536 [Geode companion] ISA
>         Control: I/O+ Mem- BusMaster- SpecCycle+ MemWINV- VGASnoop-
> ParErr+ Stepping- SERR- FastB2B- DisINTx-
>         Status: Cap- 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium
> >TAbort- SERR- 
>         Region 0: I/O ports at 24b0 [size=8]
>         Region 1: I/O ports at 1c00 [size=256]
>         Region 2: I/O ports at 2400 [size=64]
>         Region 3: I/O ports at 2480 [size=32]
>         Region 4: I/O ports at 2000 [size=128]
>         Region 5: I/O ports at 2440 [size=64]

Region 1: 1C00 is what you want to use. The driver should check that BAR and use that address.

Marc