Hi, On Thu, Jun 18, 2015 at 10:46:41PM +0100, bruce bushby wrote: > Hi > > I wanted to ask if anybody is having or has had problems with "A13 I2C bus > locked"? > > I'm using a "Latest" version of u-boot and 4.1 release candidate. I've also > tried using an older U-Boot (2014.04) .... tomorrow I'll try some older > kernels but thought I would check with the list at the same time. > > I'm using the Olimex A13-SOM with nothing connected and have tried a couple > of different power supplies just in case it was a voltage issue. > > > > Some console extracts: > > > U-Boot SPL 2015.04 (Jun 18 2015 - 17:32:42) > DRAM: 512 MiB > Failed to set core voltage! Can't set CPU frequency > > > U-Boot 2015.04 (Jun 18 2015 - 17:32:42) Allwinner Technology > > CPU: Allwinner A13 (SUN5I) > I2C: ready > DRAM: 512 MiB > MMC: SUNXI SD/MMC: 0 > *** Warning - bad CRC, using default environment > > Setting up a 1024x768 vga console > In: serial > Out: vga > Err: vga > Net: No ethernet found. > starting USB... > USB0: USB EHCI 1.00 > scanning bus 0 for devices... 1 USB Device(s) found > scanning usb for storage devices... 0 Storage Device(s) found > Hit any key to stop autoboot: 0 > switch to partitions #0, OK > mmc0 is current device > Scanning mmc 0:1... > Found U-Boot script /boot.scr > reading /boot.scr > 318 bytes read in 21 ms (14.6 KiB/s) > ## Executing script at 43100000 > reading uImage > 4281912 bytes read in 666 ms (6.1 MiB/s) > reading sun5i-a13-olinuxino-micro.dtb
So you're using a DT for a board that is not yours. Please NEVER do that, unless you're willing to take the risk of blowing your board up. > 14674 bytes read in 36 ms (397.5 KiB/s) > ## Booting kernel from Legacy Image at 46000000 ... > Image Name: Linux-4.1.0-rc6 > Image Type: ARM Linux Kernel Image (uncompressed) > Data Size: 4281848 Bytes = 4.1 MiB > Load Address: 40008000 > Entry Point: 40008000 > Verifying Checksum ... OK > ## Flattened Device Tree blob at 49000000 > Booting using the fdt blob at 0x49000000 > Loading Kernel Image ... OK > Using Device Tree in place at 49000000, end 49006951 > > Starting kernel ... > > [ 0.000000] Booting Linux on physical CPU 0x0 > [ 0.000000] Initializing cgroup subsys cpuset > [ 0.000000] Initializing cgroup subsys cpu > [ 0.000000] Initializing cgroup subsys cpuacct > [ 0.000000] Linux version 4.1.0-rc6 (br...@core.home.local) (gcc version > 4.9.2 (Buildroot 2015.08-git-00187-g0db1c13) ) #1 SMP Thu Jun 18 17:40:32 > BST 2015 > > ...... Usually these dots are helpful. > # ls -l /dev | grep i2c > crw------- 1 root root 89, 0 Jan 1 00:00 i2c-0 > crw------- 1 root root 89, 1 Jan 1 00:00 i2c-1 > crw------- 1 root root 89, 2 Jan 1 00:00 i2c-2 > # > # i2cdetect -l > i2c-0 i2c mv64xxx_i2c adapter I2C adapter > i2c-1 i2c mv64xxx_i2c adapter I2C adapter > i2c-2 i2c mv64xxx_i2c adapter I2C adapter > # > # i2cdetect -y 0 > 0 1 2 3 4 5 6 7 8 9 a b c d e f > 00: [ 55.294387] i2c i2c-0: mv64xxx: I2C bus locked, block: 1, > time_left: 0 > -- [ 57.294387] i2c i2c-0: mv64xxx: , block: 1, time_left: 0 > -- [ 59.294474] i2c i2c-0: mv64xxx: I2C bus locked, block: 1, time_left: 0 > -- [ 61.294381] i2c i2c-0: mv64xxx: I2C bus locked, block: 1, time_left: 0 > -- ^C[ 63.294436] i2c i2c-0: mv64xxx: I2C bus locked, block: 1, > time_left: 0 Do you have pullups on that bus? Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
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