RBPI2 ds1307 rtc kernel panic

[Jukka Ukkonen]

On 09/27/15 13:34, Stefan Parvu wrote:
> 
> Im seeing kernel panics after I have compiled support for DS1307 RTC
> device on RBPI2 hardware:
> 
> panic: sleepq_add: td 0xc395b000 to sleep on wchan 0xc39fa380 with
> sleeping prohibited
> 
> The system here:
> 
> iichb0: <BCM2708/2835 BSC controller> mem 0x205000-0x20501f irq 61 on
> simplebus0
> iicbus0: <OFW I2C bus> on iichb0
> iic0: <I2C generic I/O> on iicbus0
> iichb1: <BCM2708/2835 BSC controller> mem 0x804000-0x80401f irq 61 on
> simplebus0
> iicbus1: <OFW I2C bus> on iichb1
> iic1: <I2C generic I/O> on iicbus1
> ds13070: <Maxim DS1307 RTC> at addr 0xd0 on iicbus1
> 
> 
> FreeBSD rpi2 11.0-CURRENT FreeBSD 11.0-CURRENT #0 r288098: Thu Aug 20
> 04:00:38 UTC 2015     root at rpi2:/usr/obj/usr/src/sys/KPI2  arm
> 
> 
> I have compiled the kernel by Vadim's procedure [1] but modified for
> RBPI2: bcm2836.dtsi:  https://github.com/vzaigrin/ds1307/issues/1
> 
> Anyone any ideas why the crash ?
> Many thanks
> 
> [1]
> https://vzaigrin.wordpress.com/2015/08/04/real-time-clock-on-raspberry-pi-with-freebsd-11/
> 


Hi Stefan!

I have used a different chip (Maxim ds3231), but I guess
the process should be much the same for your chip.

In my kernel configuration (sys/arm/conf/RPI-B) I have
added this line ...

device		ds3231

in your case this should become

device		ds1307

In the DTS file (sys/boot/fdt/dts/arm/rpi.dts) I added
the attached patch.
In your case you should of course change the name of
the chip in the DTS to ds1307 as well.

The same changes work also for a ds3231 on RPI2.
I have successfully equipped both my RPI-B and my PRI2
with the ds3231 chip. For RPI2 the files to modify are
- sys/arm/conf/RPI2 and
- sys/boot/fdt/dts/arm/rpi2.dts

I hope this helps.

Cheers,
--jau

-------------- next part --------------
A non-text attachment was scrubbed...
Name: RPI-B-dts-ds3231.patch
Type: text/x-patch
Size: 486 bytes
Desc: not available
URL: <http://lists.freebsd.org/pipermail/freebsd-arm/attachments/20150927/6c0bf110/attachment.bin>