*** This bug is a duplicate of bug 1496756 ***
https://bugs.launchpad.net/bugs/1496756
** This bug has been marked a duplicate of bug 1496756
Nexus 7 devices which ship with android 5 need revised storage drivers
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https://bugs.launchpad.net/bugs/1497472
Title:
Kernel fails to find devices to mount
Status in linux-flo package in Ubuntu:
Confirmed
Bug description:
I posted more info here: https://github.com/ddagunts/UTCWM_N7_patch
Long story short, newer Nexus 7 "flo" models, made in/after late 2014 have a
different revision to their eMMC controller/hardware/something. This causes
Ubuntu Touch to fail to boot (or enter recovery). A kernel with the following
patch is needed:
```
mmc: add 5.0 emmc support
bug: 17968808 Kernel change for new eMMC v5.0 parts for FLO/DEB
Change-Id: Ia18152457fe3ff70401b199c267fa37374b9d544
Signed-off-by: hsuan-chih_chen <[email protected]>
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index dc4b125..ea1eca7 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -293,7 +293,7 @@
}
card->ext_csd.rev = ext_csd[EXT_CSD_REV];
- if (card->ext_csd.rev > 6) {
+ if (card->ext_csd.rev > 7) {
pr_err("%s: unrecognised EXT_CSD revision %d\n",
mmc_hostname(card->host), card->ext_csd.rev);
err = -EINVAL;
```
I answered a question about this here:
http://askubuntu.com/questions/674179/ubuntu-device-flash-fails-on-
nexus-7-2013-android-5-0-2-cant-copy-image-to
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