Date: Wed, 3 Feb 2016 16:40:24 +0200 From: Jukka Ukkonen <jau789@gmail.com> To: freebsd-arm <freebsd-arm@FreeBSD.org> Subject: ds3231 suddenly failing Message-ID: <56B21158.80401@gmail.com>
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Hello all,
Previously my RPI2 had no problems with ds3231 RTC.
Now 11.0-CURRENT r295206 shows these during boot...
ds32310: <Maxim DS3231 RTC> at addr 0x1a0 on iicbus1
ds32310: cannot read from RTC.
Trying sysctl dev.ds3231 gives me this...
dev.ds3231.0.%parent: iicbus1
dev.ds3231.0.%pnpinfo: name=rtc compat=maxim,ds3231
dev.ds3231.0.%location: addr=0x1a0
dev.ds3231.0.%driver: ds3231
dev.ds3231.0.%desc: Maxim DS3231 RTC
dev.ds3231.%parent:
Trying "i2c -s" does not show anything on either
/dev/iic0 or /dev/iic1.
AFAIK I have not changed anything in the build.
Checking the contents of rpi2.dtb says this about
the clock chip...
rtc {
compatible = "maxim,ds3231";
reg = <0xd0>;
};
I guess that the alert "cannot read from RTC." is
due to the fact that "addr 0x1a0" does not match
"reg = <0xd0>;" in the DTB. It just does not dawn
to me where the kernel found the alternate value.
Any ideas?
--jau
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