Date: Mon, 05 Mar 2007 07:49:20 -0700 (MST) From: "M. Warner Losh" <imp@bsdimp.com> To: krassi@bulinfo.net Cc: freebsd-arm@freebsd.org Subject: Re: IIC support? Message-ID: <20070305.074920.-1090027333.imp@bsdimp.com> In-Reply-To: <45EC2BF9.2000804@bulinfo.net> References: <45EC2667.9040004@bulinfo.net> <20070305.072919.2010473806.imp@bsdimp.com> <45EC2BF9.2000804@bulinfo.net>
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In message: <45EC2BF9.2000804@bulinfo.net>
Krassimir Slavchev <krassi@bulinfo.net> writes:
: M. Warner Losh wrote:
: > In message: <45EC2667.9040004@bulinfo.net>
: > Krassimir Slavchev <krassi@bulinfo.net> writes:
: > : Warner Losh wrote:
: > : >> I have problems to access the iic eeprom from userland. Even after set
: > : >> SCAN_IICBUS in iicbus.c nothing has been detected. I have made some
: > : >> tests from the bootloader to read/write from/to the eeprom and they work.
: > : >> Is there any known problems with TWI or any differences between board
: > : >> settings?
: > : >>
: > : >
: > : > The IIC bus is not a self enumerating bus. Bad things happen when you
: > : > go out and try to 'probe' it, although often you can get away with
: > : > that. FreeBSD takes a conservative approach. You need hints for each
: > : > iic device on bus that you have on your board.
: > : >
: > : >
: > : Ok, that was just for testing.
: > :
: > : I am trying to write a driver for pcf8563 (RTC similar to ds1672) but
: > : when I call the iicbus_transfer() function the iicbus_transfer_gen() is
: > : called instead of at91_twi_transfer().
: > : In the kernel config file I have:
: > : ...
: > : device at91_twi
: > : device iicbus
: > : ...
: > :
: > : Is this correct or I miss something else?
: >
: > Should be correct. What version of FreeBSD are you using?
: >
: 7.0-CURRENT, 2 days old
OK. I'll take a look to see if there are unmerged patches from p4.
I'm nearly positive that I fixed this...
Warner
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