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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">how can I access the SMBus of the MinnowMax under Linux?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I’ve successfully build an sdcard with a current Yocto-Linux (top of tree, with 3.19.0er kernel).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">There are two modules (automatically) loaded with i2c-support:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">- i2c_i801<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">- i2c_designware_core<o:p></o:p></span></p>
<p class="MsoListParagraph"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">root@intel-corei7-64:~# lsmod<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Module Size Used by<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">i2c_i801 10830 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">uio 9941 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">iwlwifi 109670 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">cfg80211 525235 1 iwlwifi<o:p></o:p></span></p>
<p class="MsoNormal">snd_hda_codec_hdmi 39400 1<o:p></o:p></p>
<p class="MsoNormal">snd_hda_intel 22091 0<o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">efivars 7981 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">snd_hda_controller 22700 1 snd_hda_intel<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">snd_hda_codec 109749 3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_controller<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">snd_pcm 93059 4 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_hda_controller<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">snd_timer 20730 1 snd_pcm<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">dw_dmac 2803 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">dw_dmac_core 15959 1 dw_dmac<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">spi_pxa2xx_platform 16651 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">i2c_designware_platform 3843 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">i2c_designware_core 7249 1 i2c_designware_platform<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">root@intel-corei7-64:~#<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I think the i2c_i801 is the driver for the smbus, the i2c_designware_xxx is for the i2c busses?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Is this correct?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I see nine i2c device-nodes (= buses):<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">root@intel-corei7-64:~# ls -la /dev/i2c*<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">crw------- 1 root root 89, 0 Mar 3 10:00 /dev/i2c-0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">crw------- 1 root root 89, 1 Mar 3 10:00 /dev/i2c-1<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">crw------- 1 root root 89, 2 Mar 3 10:00 /dev/i2c-2<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">crw------- 1 root root 89, 3 Mar 3 10:00 /dev/i2c-3<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">crw------- 1 root root 89, 4 Mar 3 10:00 /dev/i2c-4<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">crw------- 1 root root 89, 5 Mar 3 10:00 /dev/i2c-5<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">crw------- 1 root root 89, 6 Mar 3 10:00 /dev/i2c-6<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">crw------- 1 root root 89, 7 Mar 3 10:00 /dev/i2c-7<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">crw------- 1 root root 89, 8 Mar 3 10:00 /dev/i2c-8<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">root@intel-corei7-64:~#<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Is one of this the smbus?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The buses 0 to 6 could be accessed with i2cdetect (i2c-0 for example):<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">root@intel-corei7-64:~# i2cdetect 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">WARNING! This program can confuse your I2C bus, cause data loss and worse!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I will probe file /dev/i2c-0.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I will probe address range 0x03-0x77.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Continue? [Y/n]<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> 0 1 2 3 4 5 6 7 8 9 a b c d e f<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">00: -- -- -- -- -- -- -- -- -- -- -- -- --<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">70: -- -- -- -- -- -- -- --<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">root@intel-corei7-64:~#<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">When I try to access the busses 7 or 8 with i2cdetect, I get an error:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">root@intel-corei7-64:~# i2cdetect 7<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Error: Can't use SMBus Quick Write command on this bus<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">root@intel-corei7-64:~#<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I would expect to see at least two devices on the smbus, one on address<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">0x50 (24C02 EEPROM) and on address 0x6c (NCT3012S). But on the<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">i2c buses 0-6 - which could be accessed with i2cdetect - there is nothing<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">detected on this addresses.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Martin<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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