Date: Thu, 20 May 2010 21:16:53 +0200 From: Rafal Jaworowski <raj@semihalf.com> To: Andreas Tobler <andreast-list@fgznet.ch> Cc: FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Subject: Re: iic/i2c debugging on PowerMac Message-ID: <C2885CB4-252F-4354-8BF3-3865C5CCD63E@semihalf.com> In-Reply-To: <4BF58342.7010707@fgznet.ch> References: <4BF58342.7010707@fgznet.ch>
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On 2010-05-20, at 20:45, Andreas Tobler wrote: > Hi, > > I'm trying to access (read/write) an i2c device on my G5. The problem is, I do not know the right i2c address although I have it from the device-tree, it's 0x15e. > > I read about the i2c utilitiy which requires the iic driver compiled into the kernel. Done that and it seems it is there: > > unin0 > iichb0 pnpinfo name=i2c compat=keywest-i2c > iicbus0 > iic0 at addr=0 > fcu0 pnpinfo name=fan compat=fcu at addr=0x15e > > But I do not have this device entry in /dev. Trying to create one does not work. > mknod /dev/iic0 c 103 0 > mknod: /dev/iic0: No such file or directory > > This is a netboot environment, might this be the cause of not being able to create the device? > Or do I have another issue? This shouldn't be related to the boot method. Do you see any failure output during iic attach (there should be a diag error)? If not try to intstrument the iic_probe() routine and see what happens. Rafalhelp
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