DS1307 RTC not working on SAM-L9260 board.

Development Boards MicroMod
1

Hi All,

I am trying to use DS1307 RTC in my At91sam9260 running on 2.6.30.4 kernel. I can not make it working.

I have enabled the following options in the menuconfig.

Device Drivers->I2C support

  1. I2C device interface

  2. I2C Hardware Bus support->GPIO-based bitbanging I2C

DeviceDrivers->Real Time Clock

1)(rtc1) RTC used to set the system time

  1. Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025

I also see the I2C interface initialisation with NULL argument in board-sam9-l9260.c file,

/* I2C */

at91_add_device_i2c(NULL, 0);

Do I need to pass something instead of NULL?

I am getting the following while booting.

g_ether gadget: Ethernet Gadget, version: Memorial Day 2008

g_ether gadget: g_ether ready

mice: PS/2 mouse device common for all mice

i2c /dev entries driver

i2c-gpio i2c-gpio: using pins 55 (SDA) and 56 (SCL)

TCP cubic registered

Initializing XFRM netlink socket

NET: Registered protocol family 17

NET: Registered protocol family 15

RPC: Registered udp transport module.

RPC: Registered tcp transport module.

drivers/rtc/hctosys.c: unable to open rtc device (rtc1)

Empty flash at 0x07b5d794 ends at 0x07b5d800

VFS: Mounted root (jffs2 filesystem) on device 31:1.

Freeing init memory: 108K

mdev: unknown user/group →

mdev: unknown user/group →

Setting system clock: hwclock: can’t open ‘/dev/misc/rtc’: No such file or direy

FAIL

Can anyone help me to get this RTC working?

2

Just a note, but this trips up a lot of people. The DS1307 is a 5v only part, so if you are supplying 3.3v, it’s not going to work.