On 2 July 2015 at 13:40, Alan Cooper <alcoop...@gmail.com> wrote: > On Wed, Jul 1, 2015 at 6:11 PM, Paul Mansfield > <paul-ker...@mansfield.co.uk> wrote: >> On 1 July 2015 at 14:24, Alan Cooper <alcooperx@.......> wrote: >>> There is a WRITE PROTECT signal from the card socket to the host >>> controller that may not be connected. You can try booting the kernel >>> with "sdhci.debug_quirks=0x10000". This tells the driver that the WP >>> signal is inverted. >> >> thanks. >> won't that cause the dock's SD card slot to switch from being writable >> whilst making the internal one writable?
> Yes, that will cause the SD dock to be read-only for read/write cards, > but this is a quick way to tell if this is the problem. Ok, I tried the quirks mode kernel option and it solves the problem of making the microSDHC card slot writable, yay! Interesting, it didn't break the dock's SDHC card slot and make it read-only, so I would guess that's connected using a USB bridge; that comes out as mmcblk2 And neither did it break the eMMC in the tablet, that's writable too, so again a great result. Is the "sdhci.debug_quirks" command line flag available without full debugging on? Now the only obstacle remaining is that grub can't see the internal memory card slot, so I guess I will need to have a small boot partition in the eMMC. At the moment I've made the tablet triple boot. With rEFInd on the eMMC's EFI partition and the SDHC card EFI partition, the UEFI firmware offers me both devices as a boot option. Windows is in the eMMC, along with a small linux install, then a full install in a partition in the SDHC card. Each EFI partitions' grub-efi finds its relevant linux installation (it seems grub-efi patches the bootable program since the grub menu and modules lives in the ext4 linux partition). sorry for the brain dump but I thought it would be useful for anyone else treading this -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
