Date: Thu, 20 May 2010 21:39:34 +0200 From: Andreas Tobler <andreast-list@fgznet.ch> To: Rafal Jaworowski <raj@semihalf.com> Cc: FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Subject: Re: iic/i2c debugging on PowerMac Message-ID: <4BF58FF6.4050202@fgznet.ch> In-Reply-To: <C2885CB4-252F-4354-8BF3-3865C5CCD63E@semihalf.com> References: <4BF58342.7010707@fgznet.ch> <C2885CB4-252F-4354-8BF3-3865C5CCD63E@semihalf.com>
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On 20.05.10 21:16, Rafal Jaworowski wrote: > > 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. unin0: <Apple UniNorth System Controller> on nexus0 unin0: Version 179 iichb0: <Keywest I2C controller> mem 0xf8001000-0xf8001fff irq 42 on unin0 iichb0: [ITHREAD] iicbus0: <OFW I2C bus> on iichb0 iicbus0: iic identify iic0: iic probe failure iic0: addr: 0x8a iicbus0: <unknown card> at addr 0 iic1: iic probe failure iic1: addr: 0x8a The same on this one: iichb1: <Keywest I2C controller> mem 0x18000-0x18fff irq 282 on macio0 iichb1: [ITHREAD] iicbus1: <OFW I2C bus> on iichb1 iicbus1: iic identify iic1: iic probe failure iic1: addr: 0x8a iicbus1: <unknown card> at addr 0 Hm, I suspect that either the kiic has an issue or the iicbus_get_addr function is not working properly. Thanks for the hint, Rafal! Andreas
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