Re: mmc driver read/write detect problem with Baytrail tablet

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On Tue, Jun 30, 2015 at 10:13 AM, Paul Mansfield <paul@xxxxxxxxxxxxxxx> wrote:
>
> Hello,
>
> I am trying to get a baytrail-t based convertible tablet working with
> linux, using kernel 4.1 built for 32 bit Debian Jessie. I've made
> good progress, making my Toshiba Click Mini work
> sufficiently well to be useable with a USB wifi adaptor (the driver
> for the integrated SDIO wifi makes it unstable).
>
> A major sticking point is that the internal microSDHC slot is always
> read only; the device node /dev/mmcblk1 is read-write but when I
> try and mount it the kernel complains it's not writable.
>
> Meanwhile the tablet has a dock which has an full sized SDHC slot,
> and that works perfectly. I can put cards in the internal and dock
> card slots and they come up as separate devices, so they're
> definitely different devices on different buses.
>
> Is there some debug I can enable to let me find out why the driver
> thinks that internal card slot is read only?
>
> Is there some way to override the mmc driver read-only/write-protect
> function to force the driver to allow writing?
>
> Needless to say the card works fine in Windows 8.1.
>

Are the reads working properly ?
Can you enable MMC_DEBUG in the kernel config to collect more information ?
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