PS I2C on Xillinux

I have some progress. FSBL is possible to create from SDK. I tried to add UART0 and I2C0 both connected to the MIO. I adjusted DTS. UART works well, but I2C is still not accessible from linux. /dev/i2c-0 does not exists.

Vatu,

Did you recompile Linux and create the dtb file form the ./scripts directory based on your updated dts file?

Thanks for answer.
I decompile DTB on first partition of SD using DTC -I dtb -O dts -o devicetree.dts devicetree.dtb. I add UART0 and I2C0 in to DTS. Last step is compiling DTB using DTC -I dts -O dtb -o devicetree.dtb devicetree.dts. Uart works fine but I2C does not.

Two possible reasons:
1. Wrong entry for I2C0 in DTS
2. Driver for I2C not found or does not exist in Xillinux.

I am linux newbie and I am not sure how to verify this.
I tried list modules by lsmod and modprobe -l. But nothing look like I2C driver. I thing that I2C driver is not instaled. I believe that it is not need recompile entire kernel. I read in  "Getting started with Xillybus on a Linux host" about compiling single module respective specified folder. This is what I tryed, but no success yet.

Hi Tim,
I am recompile kernel. I am use git clone https://github.com/Digilent/linux-3.3-digilent.git to get sources. I am apply 6 patches from /usr/src/xillinux/kernel-patches successfly. I am recompile kernel using by make. Then I copy zImage from arch/arm/boot to first partition on SD.

I am decompile DTB on first partition of SD using DTC -I dtb -O dts -o devicetree.dts devicetree.dtb. I add UART0 and I2C0 in to DTS.

ttserial@e0000000 {
tttclock = <0x2faf080>;
tttcompatible = "xlnx,ps7-uart-1.00.a", "xlnx,xuartps";
tttdevice_type = "serial";
tttinterrupt-parent = <0x1>;
tttinterrupts = <0x0 0x1b 0x0>;
tttreg = <0xe0000000 0x1000>;
tttxlnx,has-modem = <0x0>;
tttxlnx,uart-clk-freq-hz = <0x2faf080>;
tt};


tti2c0: i2c@e0004000 {
tttcompatible = "xlnx,ps7-i2c-1.00.a";
tttreg = <0xE0004000 0x1000>;
tttinterrupts = <0 25 0>;
tttinterrupt-parent = <1>;
tttbus-id = <0>;
tttinput-clk = <50000000>;
ttti2c-clk = <100000>;
ttt
ttt#address-cells = <1>;
ttt#size-cells = <0>;
tt};

Last step is compiling DTB using DTC -I dts -O dtb -o devicetree.dtb devicetree.dts.

After power off and power on zedboard boot successfly.





U-Boot 2012.04.01 (Oct 16 2012 - 17:41:50)

DRAM:  512 MiB
WARNING: Caches not enabled
MMC:   SDHCI: 0
Using default environment

In:    serial
Out:   serial
Err:   serial
Net:   zynq_gem
Hit any key to stop autoboot:  0
Copying Linux from SD to RAM...
Device: SDHCI
Manufacturer ID: 1d
OEM: 4144
Name: SD
Tran Speed: 25000000
Rd Block Len: 512
SD version 2.0
High Capacity: Yes
Capacity: 15 GiB
Bus Width: 4-bit
reading zImage

2674504 bytes read
reading devicetree.dtb

6483 bytes read
reading ramdisk8M.image.gz

** Unable to read "ramdisk8M.image.gz" from mmc 0:1 **
## Starting application at 0x00008000 ...
Uncompressing Linux... done, booting the kernel.
[    0.000000] Booting Linux on physical CPU 0
[    0.000000] Linux version 3.3.0-xillinux-1.0+ (root@arbot2) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #1 SMP PREEMPT Sat Nov 10 20:54:10 UTC 2012
[    0.000000] CPU: ARMv7 Processor [413fc090] revision 0 (ARMv7), cr=18c5387d
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] Machine: Xilinx Zynq Platform, model: Xillinux for Zedboard
[    0.000000] bootconsole [earlycon0] enabled
[    0.000000] Memory policy: ECC disabled, Data cache writealloc
[    0.000000] BUG: mapping for 0xf8f00000 at 0xfe00c000 out of vmalloc space
[    0.000000] BUG: mapping for 0xe0000000 at 0xfe000000 out of vmalloc space
[    0.000000] BUG: mapping for 0xffff1000 at 0xfe200000 out of vmalloc space
[    0.000000] PERCPU: Embedded 7 pages/cpu @c09c0000 s5440 r8192 d15040 u32768
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 125824
[    0.000000] Kernel command line: consoleblank=0 root=/dev/mmcblk0p2 rw rootwait earlyprintk
[    0.000000] PID hash table entries: 2048 (order: 1, 8192 bytes)
[    0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
[    0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
[    0.000000] Memory: 240MB 256MB = 496MB total
[    0.000000] Memory: 497428k/497428k available, 26860k reserved, 0K highmem
[    0.000000] Virtual kernel memory layout:
[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
[    0.000000]     fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
[    0.000000]     vmalloc : 0xe0800000 - 0xfd000000   ( 456 MB)
[    0.000000]     lowmem  : 0xc0000000 - 0xe0000000   ( 512 MB)
[    0.000000]     pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
[    0.000000]     modules : 0xbf000000 - 0xbfe00000   (  14 MB)
[    0.000000]       .text : 0xc0008000 - 0xc04bf650   (4830 kB)
[    0.000000]       .init : 0xc04c0000 - 0xc04e9540   ( 166 kB)
[    0.000000]       .data : 0xc04ea000 - 0xc051bfa0   ( 200 kB)
[    0.000000]        .bss : 0xc051bfc4 - 0xc0538028   ( 113 kB)
[    0.000000] Preemptible hierarchical RCU implementation.
[    0.000000]  Verbose stalled-CPUs detection is disabled.
[    0.000000] NR_IRQS:128
[    0.000000] xlnx,ps7-ttc-1.00.a #0 at 0xe0800000, irq=43
[    0.000000] Console: colour dummy device 80x30
[    0.000000] console [tty0] enabled, bootconsole disabled

Ubuntu 12.04 LTS arbot2 ttyPS0

arbot2 login: root (automatic login)

Last login: Sun Nov 11 08:00:07 UTC 2012 from 192.168.10.100 on pts/1
Welcome to the Xillinux distribution for Zynq-7000 EPP.

You may communicate data with standard FPGA FIFOs in the logic fabric by
writing to or reading from the /dev/xillybus_* device files. Additional
pipe files of that sort can be set up at request of a custom Xillybus IP core.

For more information: http://www.xillybus.com.

To start a graphical X-Windows session, type "startx" at shell prompt.



But without i2c. :-(
i2cdetect -l returns nothing.

I found log entry in /var/log/dmesg

[    1.430000] xi2cps e0004000.i2c: 100 kHz mmio e0004000 irq 57

But /dev/i2c-0 still does not exists.
I have no idea.
Any suggestions?

Thanks

Solved. It is easy. I2C-dev module must be installed (by default is disabled). It is controlled by option CONFIG_I2C_CHARDEV in .config.


Vatu

There is detailed procedure how to get working PS I2C.

http://www.arbot.cz/post/2012/11/14/PS-I2C-in-Xillinux.aspx


Vatu

There is detailed procedure how to get working PS I2C.

http://www.arbot.cz/post/2012/11/14/PS-I2C-in-Xillinux.aspx


Vatu

Could somebody tell me if there is any I2C device on Zedboard to play with?