Booting PhyTec PCM043/IMX35 from USB/SD-Card

Booting PhyTec PCM043/IMX35 from USB/SD-Card

[Peter Kuennemann@Crane-Soft]

Hi all.

I am trying to setup my PCM043/IMX35 board to boot from the
USB MMC card but til now I do have have any clue how to manage.
Searching the net, did not provide any hints regard that board.

I'ld like to have barebox to allow me to use the USB/MMC card
as boot device. Is there a chance to boot from SD-Card at all?

-- barebox configuration data --

I have enabled USB support (USB_EHCI/OHCI and  USB_STORAGE ) as well as
CONFIG_UBI=y
CONFIG_DISK=y
CONFIG_DISK_WRITE=y
...
CONFIG_USB=y
CONFIG_USB_EHCI=y
CONFIG_USB_OHCI=y
# CONFIG_USB_ULPI is not set
# CONFIG_USB_TWL4030 is not set
CONFIG_USB_STORAGE=y
# CONFIG_USB_GADGET is not set
# CONFIG_VIDEO is not set
CONFIG_MCI=y
...
CONFIG_MCI_STARTUP=y
CONFIG_MCI_INFO=y
CONFIG_MCI_WRITE=y
CONFIG_MCI_IMX_ESDHC=y
CONFIG_MCI_IMX_ESDHC_PIO=y
Device list in bareBox after boot:

---------

barebox@Phytec phyCORE-i.MX35:/ ls /dev
defaultenv             env0                   imx_iim_bank0
imx_iim_bank1          imx_iim_bank2          imx_iim_bank3
imx_iim_bank4          imx_iim_bank5          imx_iim_bank6
imx_iim_bank7          mem                    nand0
nand0.barebox          nand0.barebox.bb       nand0.bareboxenv
nand0.bareboxenv.bb    nand0.kernel           nand0.kernel.bb
nand0.root             nand0.root.bb          nand_oob0
nor0                   nor0.barebox           nor0.bareboxenv
nor0.kernel            nor0.root              phy0
ram0                   self0                  zero

----------

And the environment:

locals:
machine=pcm043
kernel_loc=nor
rootfs_loc=nor
rootfs_type=jffs2
rootfsimage=root.jffs2
kernelimage_type=uimage
kernelimage=uImage-pcm043
nfsroot=192.168.1.161:/tftpboot
autoboot_timeout=3
bootargs=console=ttymxc0,115200
nor_parts=256k(barebox)ro,128k(bareboxenv),2M(kernel),-(root)
rootfs_mtdblock_nor=3
nand_parts=256k(barebox)ro,128k(bareboxenv),2M(kernel),-(root)
rootfs_mtdblock_nand=7
PS1=\e[1;32mbarebox@\e[1;31m\h:\w\e[0m
globals:
barebox_loc=nor
armlinux_architecture=2072
PATH=/env/bin

Any comments will be very much appreciated.

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Re: Booting PhyTec PCM043/IMX35 from USB/SD-Card

[Sascha Hauer]

Hi Peter,

On Wed, May 23, 2012 at 05:43:52PM +0200, Peter Kuennemann@Crane-Soft wrote:
> Hi all.
> 
> I am trying to setup my PCM043/IMX35 board to boot from the
> USB MMC card but til now I do have have any clue how to manage.
> Searching the net, did not provide any hints regard that board.
> 
> I'ld like to have barebox to allow me to use the USB/MMC card
> as boot device. Is there a chance to boot from SD-Card at all?

Do you want to start barebox from USB/MMC or do you only want to load
the kernel from USB/MMC? The latter is possible, though you have to add
support for it. See arch/arm/boards/eukrea_cpuimx35/eukrea_cpuimx35.c
for an example how to do it. Basically for MMC you have to configure
the iomuxer and register the device. USB might be a bit more
complicated, you have to configure the phy correctly.

Sascba


-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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Re: Booting PhyTec PCM043/IMX35 from USB/SD-Card

[Peter Kuennemann@Crane-Soft]

Am 24.05.2012 21:55, schrieb Sascha Hauer:
> Hi Peter,
> 
> On Wed, May 23, 2012 at 05:43:52PM +0200, Peter Kuennemann@Crane-Soft wrote:
>> Hi all.
>>
>> I am trying to setup my PCM043/IMX35 board to boot from the
>> USB MMC card but til now I do have have any clue how to manage.
>> Searching the net, did not provide any hints regard that board.
>>
>> I'ld like to have barebox to allow me to use the USB/MMC card
>> as boot device. Is there a chance to boot from SD-Card at all?
> 
> Do you want to start barebox from USB/MMC or do you only want to load
> the kernel from USB/MMC? The latter is possible, though you have to add
> support for it. See arch/arm/boards/eukrea_cpuimx35/eukrea_cpuimx35.c
> for an example how to do it. Basically for MMC you have to configure
> the iomuxer and register the device. USB might be a bit more
> complicated, you have to configure the phy correctly.
> 
> Sascba
> 
Thanks a lot for your reply, Sascha. I'ld really want to load the
Kernel from the MMC and want to have the rootfs there as well. barebox
is goint to stay in flash anyhow.
I already tried to boot the Kernel from NOR/NAND but have problems to
mount the rootfs on MMC.
I think either way should work for us, booting kernel from MMC and having
rootfs on MMC or boot kernel from flash and have rootfs on MMC.
I'll investiage the sample that you referred to but I wonder if you could
point me into right direction regarding the rootfs on MMC?

---

To have kernel in flash and rootfs on MMC i tried bootargs as:

... root=/dev/mmcblk0p1 rootfstype=ext2 rootflags=noatime rw noinitrd rootwait ..

and it boots the kernel properly from flash up to:
...
mmcblk0: mmc0:a95c SD01G 968 MiB     <== Recognized the sd card
 mmcblk0: p1                         <== and partion 1
...
1f00             256 mtdblock0 (driver?)
1f01             128 mtdblock1 (driver?)
1f02            2048 mtdblock2 (driver?)
1f03           30336 mtdblock3 (driver?)
1f04         1048576 mtdblock4 (driver?)
b300          992000 mmcblk0 driver: mmcblk
  b301          991585 mmcblk0p1                    <=== Something missing here?
No filesystem could mount root, tried:  ext2        <===
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,1) <===

The mmc does contain a ext2 filesystem with the proper rootfs copied from
the jffs2.image that I mounted under Ubuntu as loop device. The kernel has ext2 fs
support compiled in.

The rootfs on the mmc is properly accessible when booting kernel and flash footfs
on the very same platform.

Peter

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Re: Booting PhyTec PCM043/IMX35 from USB/SD-Card

[Sascha Hauer]

Hi Peter,

On Fri, May 25, 2012 at 11:35:36AM +0200, Peter Kuennemann@Crane-Soft wrote:
> 
> 
> To have kernel in flash and rootfs on MMC i tried bootargs as:
> 
> ... root=/dev/mmcblk0p1 rootfstype=ext2 rootflags=noatime rw noinitrd rootwait ..
> 
> and it boots the kernel properly from flash up to:
> ...
> mmcblk0: mmc0:a95c SD01G 968 MiB     <== Recognized the sd card
>  mmcblk0: p1                         <== and partion 1
> ...
> 1f00             256 mtdblock0 (driver?)
> 1f01             128 mtdblock1 (driver?)
> 1f02            2048 mtdblock2 (driver?)
> 1f03           30336 mtdblock3 (driver?)
> 1f04         1048576 mtdblock4 (driver?)
> b300          992000 mmcblk0 driver: mmcblk
>   b301          991585 mmcblk0p1                    <=== Something missing here?
> No filesystem could mount root, tried:  ext2        <===
> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,1) <===
> 
> The mmc does contain a ext2 filesystem with the proper rootfs copied from
> the jffs2.image that I mounted under Ubuntu as loop device. The kernel has ext2 fs
> support compiled in.
> 
> The rootfs on the mmc is properly accessible when booting kernel and flash footfs
> on the very same platform.

Has this been solved in the mean time? The above looks correct, I have
no idea what's wrong.

Sascha


-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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Re: Booting PhyTec PCM043/IMX35 from USB/SD-Card

[CRANESOFT]

Am 31.05.2012 um 20:27 schrieb Sascha Hauer <s.hauer@pengutronix.de>:

> Hi Peter,
> 
> On Fri, May 25, 2012 at 11:35:36AM +0200, Peter Kuennemann@Crane-Soft wrote:
>> 
>> 
>> To have kernel in flash and rootfs on MMC i tried bootargs as:
>> 
>> ... root=/dev/mmcblk0p1 rootfstype=ext2 rootflags=noatime rw noinitrd rootwait ..
>> 
>> and it boots the kernel properly from flash up to:
>> ...
>> mmcblk0: mmc0:a95c SD01G 968 MiB     <== Recognized the sd card
>> mmcblk0: p1                         <== and partion 1
>> ...
>> 1f00             256 mtdblock0 (driver?)
>> 1f01             128 mtdblock1 (driver?)
>> 1f02            2048 mtdblock2 (driver?)
>> 1f03           30336 mtdblock3 (driver?)
>> 1f04         1048576 mtdblock4 (driver?)
>> b300          992000 mmcblk0 driver: mmcblk
>>  b301          991585 mmcblk0p1                    <=== Something missing here?
>> No filesystem could mount root, tried:  ext2        <===
>> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,1) <===
>> 
>> The mmc does contain a ext2 filesystem with the proper rootfs copied from
>> the jffs2.image that I mounted under Ubuntu as loop device. The kernel has ext2 fs
>> support compiled in.
>> 
>> The rootfs on the mmc is properly accessible when booting kernel and flash footfs
>> on the very same platform.
> 
> Has this been solved in the mean time? The above looks correct, I have
> no idea what's wrong.
> 
> Sascha
> 
Sascha,
I am sorry but this issue has not yet been resolved. I am currently out of office but will pick it up after my return. It may well be a Kernel configuration Problem.

Peter
> 
> -- 
> Pengutronix e.K.                           |                             |
> Industrial Linux Solutions                 | http://www.pengutronix.de/  |
> Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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Re: Booting PhyTec PCM043/IMX35 from USB/SD-Card

[Peter Kuennemann@Crane-Soft]

  mit freundlichen Grüßen,
  sincerely yours
  sincères salutations

Peter Künnemann
Kappeler Strasse 207
D-40599 Düsseldorf

Mobil: +49 151 40511525
       +49 211 1663157

http://www.crane-soft.de

Am 31.05.2012 20:27, schrieb Sascha Hauer:
> Hi Peter,
> 
> On Fri, May 25, 2012 at 11:35:36AM +0200, Peter Kuennemann@Crane-Soft wrote:
>>
>>
>> To have kernel in flash and rootfs on MMC i tried bootargs as:
>>
>> ... root=/dev/mmcblk0p1 rootfstype=ext2 rootflags=noatime rw noinitrd rootwait ..
>>
>> and it boots the kernel properly from flash up to:
>> ...
>> mmcblk0: mmc0:a95c SD01G 968 MiB     <== Recognized the sd card
>>  mmcblk0: p1                         <== and partion 1
>> ...
>> 1f00             256 mtdblock0 (driver?)
>> 1f01             128 mtdblock1 (driver?)
>> 1f02            2048 mtdblock2 (driver?)
>> 1f03           30336 mtdblock3 (driver?)
>> 1f04         1048576 mtdblock4 (driver?)
>> b300          992000 mmcblk0 driver: mmcblk
>>   b301          991585 mmcblk0p1                    <=== Something missing here?
>> No filesystem could mount root, tried:  ext2        <===
>> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,1) <===
>>
>> The mmc does contain a ext2 filesystem with the proper rootfs copied from
>> the jffs2.image that I mounted under Ubuntu as loop device. The kernel has ext2 fs
>> support compiled in.
>>
>> The rootfs on the mmc is properly accessible when booting kernel and flash footfs
>> on the very same platform.
> 
> Has this been solved in the mean time? The above looks correct, I have
> no idea what's wrong.

The case has been partly solved now. I am able to boot from NAND and NOR but I cannot
access the MMC. Reason for the kernel messages ...(driver?) above was a missing device
"mxc_nand" in the kernel parms for mtdparts:

    mtdparts=physmap-flash.0:256k(barebox)ro,128k(bareboxenv),2M(kernel),-(root); \
    mxc_nand:256k(barebox)ro,128k(bareboxenv),2M(kernel),-(root)

However, I still cannot access the mmc from barebox. It would be enough to be able to
read the mmc. I want to be able to store kernel or rootfs image updates on the mmc
and flash them to either NAND or NOR after reboot to enable remote update services.

Question: "How can I access the MMC from barebox (read only may be sufficient)

Regards, Peter

-- 
Barebox device list:

barebox@MKT.i357-CPU:/ ls -l /dev
crw-------         32 imx_iim_bank0
crw-------         32 imx_iim_bank1
crw-------         32 imx_iim_bank2
crw-------         32 imx_iim_bank3
crw-------         32 imx_iim_bank4
crw-------         32 imx_iim_bank5
crw-------         32 imx_iim_bank6
crw-------         32 imx_iim_bank7
cr-------- 4294967295 zero
crw-------  134217728 ram0
crw-------       8281 defaultenv
crw------- 4294967295 mem
crw-------         64 phy0
crw------- 1073741824 nand0
cr--------   33554432 nand_oob0
crw-------   33554432 nor0
crw-------     262144 self0
crw-------     131072 env0
crw-------     262144 nor0.barebox
crw-------     131072 nor0.bareboxenv
crw-------    2097152 nor0.kernel
crw-------   31064064 nor0.root
crw-------     262144 nand0.barebox
crw-------     131072 nand0.bareboxenv
crw-------    2097152 nand0.kernel
crw------- 1071251456 nand0.root
crw------- 1070071808 nand0.root.bb
crw-------    2097152 nand0.kernel.bb
crw-------     131072 nand0.bareboxenv.bb
crw-------     262144 nand0.barebox.bb



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Re: Booting PhyTec PCM043/IMX35 from USB/SD-Card

[Sascha Hauer]

On Thu, Jun 28, 2012 at 08:53:32AM +0200, Peter Kuennemann@Crane-Soft wrote:
> > 
> > Has this been solved in the mean time? The above looks correct, I have
> > no idea what's wrong.
> 
> The case has been partly solved now. I am able to boot from NAND and NOR but I cannot
> access the MMC. Reason for the kernel messages ...(driver?) above was a missing device
> "mxc_nand" in the kernel parms for mtdparts:
> 
>     mtdparts=physmap-flash.0:256k(barebox)ro,128k(bareboxenv),2M(kernel),-(root); \
>     mxc_nand:256k(barebox)ro,128k(bareboxenv),2M(kernel),-(root)
> 
> However, I still cannot access the mmc from barebox. It would be enough to be able to
> read the mmc. I want to be able to store kernel or rootfs image updates on the mmc
> and flash them to either NAND or NOR after reboot to enable remote update services.
> 
> Question: "How can I access the MMC from barebox (read only may be sufficient)

The pcm043 currently does not have mmc support. You have to add this to
the board file:

imx35_add_mmc0(NULL);

or

imx35_add_mmc1(NULL);

depending on which port is routed to the slot. Also you have to setup
the iomuxer (you can probably copy the pin settings from the kernel). Of
course you also have to enable MMC support in the config.

Sascha


-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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Re: Booting PhyTec PCM043/IMX35 from USB/SD-Card

[Peter Kuennemann@Crane-Soft]

Am 28.06.2012 12:43, schrieb Sascha Hauer:
>> ...
>> However, I still cannot access the mmc from barebox. It would be enough to be able to
>> read the mmc. I want to be able to store kernel or rootfs image updates on the mmc
>> and flash them to either NAND or NOR after reboot to enable remote update services.
>>
>> Question: "How can I access the MMC from barebox (read only may be sufficient)
> 
> The pcm043 currently does not have mmc support. You have to add this to
> the board file:
> 
> imx35_add_mmc0(NULL);
> 
> or
> 
> imx35_add_mmc1(NULL);
> 
> depending on which port is routed to the slot. Also you have to setup
> the iomuxer (you can probably copy the pin settings from the kernel). Of
> course you also have to enable MMC support in the config.
> 
> Sascha
> 
> 

I have tried to update the board code accordingly but stumbled upon another
problem. The size of barebox increased to 0x40bb7 so I changed the
partition definitions in pcm043.c as follows:

#define CONFIG_MX35_BBSIZE      0x42000
   ...
   devfs_add_partition("nor0", 0x00000, CONFIG_MX35_BBSIZE, PARTITION_FIXED, "self0"); /* ourself */
   devfs_add_partition("nor0", CONFIG_MX35_BBSIZE, 0x20000, PARTITION_FIXED, "env0");
   ...
Barebox boots OK but after having saved the environment (saveenv) it dow not boot anymore.

Barebox boot messages ...

Malloc space: 0x86e00000 -> 0x87dfffff (size 16 MB)
Stack space : 0x86df8000 -> 0x86e00000 (size 32 kB)
envfs: wrong magic on /dev/env0
no valid environment found on /dev/env0. Using default environment   <== expected
running /env/bin/init...

devinfo <== What is defined ?
...
`---- cfi_flash0
     `---- 0x00000000-0x01ffffff: /dev/nor0
     `---- 0x00000000-0x00041fff: /dev/self0
     `---- 0x00042000-0x0005ffff: /dev/env0

saveenv  <== save the environment
reset    <== nothing after here

What is wrong here?

Peter

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Re: Booting PhyTec PCM043/IMX35 from USB/SD-Card

[Sascha Hauer]

On Thu, Jun 28, 2012 at 03:36:22PM +0200, Peter Kuennemann@Crane-Soft wrote:
> 
> Am 28.06.2012 12:43, schrieb Sascha Hauer:
> >> ...
> >> However, I still cannot access the mmc from barebox. It would be enough to be able to
> >> read the mmc. I want to be able to store kernel or rootfs image updates on the mmc
> >> and flash them to either NAND or NOR after reboot to enable remote update services.
> >>
> >> Question: "How can I access the MMC from barebox (read only may be sufficient)
> > 
> > The pcm043 currently does not have mmc support. You have to add this to
> > the board file:
> > 
> > imx35_add_mmc0(NULL);
> > 
> > or
> > 
> > imx35_add_mmc1(NULL);
> > 
> > depending on which port is routed to the slot. Also you have to setup
> > the iomuxer (you can probably copy the pin settings from the kernel). Of
> > course you also have to enable MMC support in the config.
> > 
> > Sascha
> > 
> > 
> 
> I have tried to update the board code accordingly but stumbled upon another
> problem. The size of barebox increased to 0x40bb7 so I changed the
> partition definitions in pcm043.c as follows:
> 
> #define CONFIG_MX35_BBSIZE      0x42000
>    ...
>    devfs_add_partition("nor0", 0x00000, CONFIG_MX35_BBSIZE, PARTITION_FIXED, "self0"); /* ourself */
>    devfs_add_partition("nor0", CONFIG_MX35_BBSIZE, 0x20000, PARTITION_FIXED, "env0");
>    ...
> Barebox boots OK but after having saved the environment (saveenv) it dow not boot anymore.
> 
> Barebox boot messages ...
> 
> Malloc space: 0x86e00000 -> 0x87dfffff (size 16 MB)
> Stack space : 0x86df8000 -> 0x86e00000 (size 32 kB)
> envfs: wrong magic on /dev/env0
> no valid environment found on /dev/env0. Using default environment   <== expected
> running /env/bin/init...
> 
> devinfo <== What is defined ?
> ...
> `---- cfi_flash0
>      `---- 0x00000000-0x01ffffff: /dev/nor0
>      `---- 0x00000000-0x00041fff: /dev/self0
>      `---- 0x00042000-0x0005ffff: /dev/env0
> 
> saveenv  <== save the environment
> reset    <== nothing after here
> 
> What is wrong here?

You should align partition sizes to eraseblock sizes.

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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Re: Booting PhyTec PCM043/IMX35 from USB/SD-Card

[Peter]

Am 28.06.2012 12:43, schrieb Sascha Hauer:
> On Thu, Jun 28, 2012 at 08:53:32AM +0200, Peter Kuennemann@Crane-Soft wrote:
>>>
>>> Has this been solved in the mean time? The above looks correct, I have
>>> no idea what's wrong.

...

>> However, I still cannot access the mmc from barebox. It would be enough to be able to
>> read the mmc. I want to be able to store kernel or rootfs image updates on the mmc
>> and flash them to either NAND or NOR after reboot to enable remote update services.
>>
>> Question: "How can I access the MMC from barebox (read only may be sufficient)
> 
> The pcm043 currently does not have mmc support. You have to add this to
> the board file:
> 
> imx35_add_mmc0(NULL);
> 
> or
> 
> imx35_add_mmc1(NULL);
> 
> depending on which port is routed to the slot. Also you have to setup
> the iomuxer (you can probably copy the pin settings from the kernel). Of
> course you also have to enable MMC support in the config.
> 
> Sascha
> 
Sascha I'ld like to pick up this thread again abd I hope that someone can
give me the hint to help me out here.

I managed to access the mmc applying your hints above. The card seem to
appear correctly with all it's partitions:

---
imx-esdhc@mci0: registered as mci0
mci@mci0: registered disk0
ehci@ehci0: USB EHCI 1.00
---
barebox:/ ls /dev
defaultenv             disk0                  disk0.0
disk0.1                env0                   full
---
I am able to boot the kernel from NOR flash and use the mmc as rootfs. However
I did not yet find a way to boot the kernel from the MMC. I set up the MMC
with 255 heads, 63 sectors/track, 245 cylinders and formated partition 1 as
VFAT and made it bootable. I then copied uImage to it. Partition 2 contains
the rootfs which can be used when booting the kernel from flash.

Barebox /env/config contains: (besides others)
...
 kernel_loc=disk
 rootfs_loc=disk
 rootfs_type=ext2
 rootfs_part_linux_dev=mmcblk0p2
 kernel_part=disk0.0
...

Trying to boot results in:
booting kernel from /dev/disk0.0

and then followed by the barebox prompt.

barebox:/

Kernel parameters are: console=ttymxc0,115200 video=mx3fb:CTP-CLAA070LC0ACW ip=dhcp root=/dev/mmcblk0p2 rootfstype=ext2 noinitrd rootwait
mtdparts=physmap-flash.0:256k(barebox)ro,128k(bareboxenv),2M(kernel),-(root);:256k(barebox)ro,128k(bareboxenv),2M(kernel),-(root)

A little help would be very much appreciated.

Regards and many thanks for your support.

Peter

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Re: Booting PhyTec PCM043/IMX35 from USB/SD-Card

[Jan Lübbe]

Hi!

On Thu, 2012-08-23 at 19:59 +0200, Peter wrote:
> I am able to boot the kernel from NOR flash and use the mmc as rootfs. However
> I did not yet find a way to boot the kernel from the MMC. I set up the MMC
> with 255 heads, 63 sectors/track, 245 cylinders and formated partition 1 as
> VFAT and made it bootable. I then copied uImage to it. Partition 2 contains
> the rootfs which can be used when booting the kernel from flash.
> 
> Barebox /env/config contains: (besides others)
> ...
>  kernel_loc=disk
>  rootfs_loc=disk
>  rootfs_type=ext2
>  rootfs_part_linux_dev=mmcblk0p2
>  kernel_part=disk0.0
> ...
> 
> Trying to boot results in:
> booting kernel from /dev/disk0.0
> 
> and then followed by the barebox prompt.

You're using the old default-env which does not support uImage on FAT
(only a kernel directly in a partition). Either switch to default-env-2
and mount the FAT ('mount /dev/disk0.0 fat /mnt') before loading the
kernel from /mnt/uImage.

Otherwise for the old default-env take a look at
<1345472428-17417-13-git-send-email-jlu@pengutronix.de>. Note that for
that to work, the FAT must be mounted by the board code or you need to
setup an automount.

Regards,
Jan
-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |


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Re: Booting PhyTec PCM043/IMX35 from USB/SD-Card

[Peter]

Am 24.08.2012 10:46, schrieb Jan Lübbe:

Jan, thanks very much for pointing me into the right direction

> Hi!
> 
> On Thu, 2012-08-23 at 19:59 +0200, Peter wrote:
>> I am able to boot the kernel from NOR flash and use the mmc as rootfs. However
>> I did not yet find a way to boot the kernel from the MMC. I set up the MMC
>> with 255 heads, 63 sectors/track, 245 cylinders and formated partition 1 as
>> VFAT and made it bootable. I then copied uImage to it. Partition 2 contains
>> the rootfs which can be used when booting the kernel from flash.
>>
>> Barebox /env/config contains: (besides others)
>> ...
>>  kernel_loc=disk
>>  rootfs_loc=disk
>>  rootfs_type=ext2
>>  rootfs_part_linux_dev=mmcblk0p2
>>  kernel_part=disk0.0
>> ...
>>
>> Trying to boot results in:
>> booting kernel from /dev/disk0.0
>>
>> and then followed by the barebox prompt.
> 
> You're using the old default-env which does not support uImage on FAT
> (only a kernel directly in a partition). Either switch to default-env-2
> and mount the FAT ('mount /dev/disk0.0 fat /mnt') before loading the
> kernel from /mnt/uImage.
> Otherwise for the old default-env take a look at
> <1345472428-17417-13-git-send-email-jlu@pengutronix.de>. Note that for
> that to work, the FAT must be mounted by the board code or you need to
> setup an automount.


After implementing all required driver and support into barebox, it turns
out that I also need to increase it's partition size to 512K. I then was
able to use the existing environment and changed the boot script as follows

elif [ x$kernel_loc = xdisk ]; then
     kdev="/dev/$kernel_part"
+    mkdir /boot
+    mount $kdev fat /boot
+    kdev=/boot/UIMAGE

Many thanks, Peter


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