Messages in this thread | | | Date | Wed, 2 Oct 2013 11:03:47 +0200 | From | "Arend van Spriel" <> | Subject | Re: using mmc2 on panda [was: Regression 3.11-rc1: omap4panda: no usb and consequently no ethernet] |
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On 10/01/2013 03:19 PM, Balaji T K wrote: >>>>>> Hi Roger, >>>>>> >>>>>> It has been a while, but I would like to pickup this thread. We >>>>>> have a couple of pandaboards used as test setup. These have an >>>>>> SDIO adapter hooked up to expansion connector A using MMC2. I have >>>>>> attached the patch file (just ignore platform_data stuff). Now on >>>>>> one board it works, but not for the other. I suspect a board issue >>>>>> so listing the two types that we use: >>>>>> >>>>>> PandaBoard rev A2 (dmesg: OMAP4430 ES2.1): works >>>>>> PandaBoardES rev B1 (dmesg: OMAP4460 ES1.1): nope >>>>>> >>>>>> Any hints for me. >>>>> >>>>> Does your PandaboardES have the WLAN chip (U4) mounted? If yes, how >>>>> do you isolate >>>>> it from your external SDIO adapter? >>> >>> On my 4460 board in front of me U4 is not populated, but U3 is (the >>> TiWi thing). >>> >>>> >>>> OK, just realized that the expansion connector uses different pads >>>> for MMC2. However, you still >>>> need to make sure that the other pins (connected to on board WLAN >>>> chip) are not muxed as MMC2. >>> >>> I think Luciano added DT patches for on-board WLAN and it uses MMC5 >>> if I am not mistaken(?). Attached are the dmesg logs of the two boards. >> >> Right. WLAN is supposed to use MMC5. But if you don't have Luca's >> patches, can you please ensure that those pins are muxed either as >> safe mode >> or as MMC5? Default seems to be safe mode, but you should cross check. >> >> Also in your patches you have set mmc2-clk to PIN_INPUT_PULLUP >> Shouldn't it be PIN_OUTPUT? >> >> Still I have no clue why it works on 4430 and not on 4460. Are you >> using the same bootloader image on both boards? >> > if you are using vaux1, can you check the voltage levels, > > From dmesg you attached, > vaux1 is set to 1.8V on omap4430 and to 2.8V on OMAP4460 > > 4430 > [ 2.425750] VAUX1_6030: 1000 <--> 3000 mV at 1800 mV > > 4460 > [ 2.244262] VAUX1_6030: 1000 <--> 3000 mV at 2800 mV
Nice catch. Not sure whether this is an issue, but worth looking into.
> Can you also check with MMC_DEBUG enabled for any clues.
building....
>> cheers, >> -roger >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-omap" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ >
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