linux-kernel - Power Management with rootfs on SDMMC.

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Date:	Fri, 2 Jan 2009 12:05:05 +0530
From:	"Sriram V" <vshrirama@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Power Management with rootfs on SDMMC.

Hi,
  I am using linux-2.6.27.  I am testing power management after
booting out of a SD/MMC card.
  My root file system is on a SD card.

  I am issuing the following command to suspend

      $ echo -n mem > /sys/power/state

 What happens is, The kernel hangs and it does not come out of suspend.
 even after i press keypad/generate serial input data.

 # echo -n mem > /sys/power/state
PM: Syncing filesystems ... done.
Freezing user space processes ... (elapsed 0.00 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done.
mmc0: card e624 removed
--- kernel hangs---

The same works, If i boot on NFS and mount a SD card.
PM works, suspend and resume work fine. This means
that the PM of SD MMC driver works properly.

However, I have a problem when the rootfs is on SDMMC card.
Has anyone tried this before?

Am i missing something here?

Regards,
sriram
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