current code does not support internal sdhc card as root partition?
Because kernel does not recognize the sdhc(mmcsd).

Do we need external umass storage for root partition?

dwcotg0: <DWC OTG 2.0 integrated USB controller> mem
0xf2980000-0xf299ffff irq 17 on simplebus0
usbus0 on dwcotg0
Timecounters tick every 10.000 msec
usbus0: 480Mbps High Speed USB v2.0
Root mount waiting for: usbus0
ugen0.1: <DWCOTG> at usbus0
uhub0: <DWCOTG OTG Root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus0
uhub0: 1 port with 1 removable, self powered
Root mount waiting for: usbus0
ugen0.2: <vendor 0x0424> at usbus0
uhub1: <vendor 0x0424 product 0x9512, class 9/0, rev 2.00/2.00, addr
2> on usbus0
uhub1: MTT enabled
uhub1: 3 ports with 2 removable, self powered
Root mount waiting for: usbus0
ugen0.3: <vendor 0x0424> at usbus0
smsc0: <vendor 0x0424 product 0xec00, rev 2.00/2.00, addr 3> on usbus0
Trying to mount root from ufs:/dev/mmcsd0s2 []...
mountroot: waiting for device /dev/mmcsd0s2 ...
smsc0: chip 0xec00, rev. 0002
miibus0: <MII bus> on smsc0
ukphy0: <Generic IEEE 802.3u media interface> PHY 1 on miibus0
ukphy0:  none, 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
ue0: <USB Ethernet> on smsc0
ue0: Ethernet address: 9a:ea:92:da:66:31
Mounting from ufs:/dev/mmcsd0s2 failed with error 19.

Loader variables:

Manual root filesystem specification:
  <fstype>:<device> [options]

2012/9/13 Hans Petter Selasky <hsela...@c2i.net>:
> On Wednesday 12 September 2012 12:24:58 Alexander Yerenkow wrote:
>> We tested kernel built by gonzo@, there working framebuffer, ue0, and
>> USB2.0 devices (in theory, I didn't have those).
>> But after some activity (like download few megabytes file) all is stuck
>> with message
>> usb device stalled
>> This is getting 100% repeatedly, no matter if download goes to sd card, or
>> to malloc-md-device.
>> If (When) this will be fixed, then Rpi would be a candy, prepared to
>> testing and more or less usable.
>> I have in plans try it with xorg-framebuffer, and with directfb, while
>> there's no video support.
> Hi,
> You should try a kernel after "r240419"
> Right now my code uses PIO mode and is a bit slow, but it should be more
> stable. Let's start from there and work on upwards?
> Anyone care to look into to optimising bus_space_region_4() calls to use
> load/store multiple?
> --HPS
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