Booting the Neo FreeRunner from SD via U-Boot

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(updated infos for P1 devices and OM 2007.2)
(add instructions to compile in ext2 fs)
Line 8: Line 8:
  
 
  CONFIG_MMC_S3C=m
 
  CONFIG_MMC_S3C=m
+
 
 
and change it to:
 
and change it to:
  
 
  CONFIG_MMC_S3C=y
 
  CONFIG_MMC_S3C=y
 +
 +
If you want to use an ext2 file system on the SD, also find the line saying:
 +
 +
CONFIG_EXT2_FS=m
 +
 +
and change it to:
 +
 +
CONFIG_EXT2_FS=y
  
 
Thats it. Now rebuild the kernel.
 
Thats it. Now rebuild the kernel.

Revision as of 19:42, 13 August 2007

Here are the steps described to boot your system from an SD card.

Contents

Step 1: Build your kernel

Kernel building is supposed to be done through OpenEmbedded. If you use the MokoMakefile open up $OMDIR/openmoko/trunk/oe/packages/linux/linux-gta01/defconfig-2.6.21.6-fic-gta01. If you are building OM-2007.2 open $OEDIR/packages/linux/linux-gta01/defconfig-2.6.21.5-fic-gta01. (Note that the kernel version may change in future versions.)

Now find the line saying:

CONFIG_MMC_S3C=m

and change it to:

CONFIG_MMC_S3C=y

If you want to use an ext2 file system on the SD, also find the line saying:

CONFIG_EXT2_FS=m

and change it to:

CONFIG_EXT2_FS=y

Thats it. Now rebuild the kernel.

Step 2: Populate SD card

Format partition 1 as ext3 (ext2 will not boot). Mount your SD card somewhere and put your image on it:

mount /dev/sda1 /mnt/moko
tar -C /mnt/moko/ -xvzf openmoko-devel-image-fic-gta01-20070313022035.rootfs.tar.gz

Now we also want the kernel on there

cp uImage /mnt/moko/boot/

If you are building OM-2007.2 you need to add "tar" to the image types in your local.conf:

IMAGE_FSTYPES = "jffs2 tar"

After building a new image by issuing bitbake openmoko-devel-image there will be a OpenMoko-....tar in the deploy directory. Copy it on the SD card by doing

mount /dev/sda1 /mnt/moko
tar -C /mnt/moko/ -xvf openmoko-devel-image-fic-gta01-20070313022035.rootfs.tar

In OM-2007.2 the last built kernel gets a special soft-link. Therefore you can copy it by doing:

cp uImage-fic-gta01-latest.bin /mnt/moko/boot/uImage

Step 3: Add uboot boot entry

On my Phase-1 Neo the boot menu entry existed already. If yours is missing it follow those instructions: Start uboot in bootmenu mode (= hold AUX while powering on) and add the following entry via serial console: (See Bootloader section on how to access an bootloader).

GTA01Bv4 # setenv menu_4 Boot from SD: setenv bootargs root=/dev/mmcblk0p1 rootdelay=5 console=ttySAC0,115200 console=tty0 loglevel=8 \${mtdparts}\; mmcinit\; ext2load mmc 0 0x32000000 /boot/\${sd_image_name}\; bootm 0x32000000
GTA01Bv4 # setenv sd_image_name uImage
GTA01Bv4 # saveenv

You can now easily boot a different kernel by changing the variable sd_image_name to the new name.

Step 4: Boot into the new system

Power off your device, insert the SD card and boot into the boot menu. You should have an entry called "Boot from SD" which does exactly that. :-)

Personal tools

Here are the steps described to boot your system from an SD card.

Step 1: Build your kernel

Kernel building is supposed to be done through OpenEmbedded. If you use the MokoMakefile open up $OMDIR/openmoko/trunk/oe/packages/linux/linux-gta01/defconfig-2.6.21.6-fic-gta01. If you are building OM-2007.2 open $OEDIR/packages/linux/linux-gta01/defconfig-2.6.21.5-fic-gta01. (Note that the kernel version may change in future versions.)

Now find the line saying:

CONFIG_MMC_S3C=m

and change it to:

CONFIG_MMC_S3C=y

If you want to use an ext2 file system on the SD, also find the line saying:

CONFIG_EXT2_FS=m

and change it to:

CONFIG_EXT2_FS=y

Thats it. Now rebuild the kernel.

Step 2: Populate SD card

Format partition 1 as ext3 (ext2 will not boot). Mount your SD card somewhere and put your image on it:

mount /dev/sda1 /mnt/moko
tar -C /mnt/moko/ -xvzf openmoko-devel-image-fic-gta01-20070313022035.rootfs.tar.gz

Now we also want the kernel on there

cp uImage /mnt/moko/boot/

If you are building OM-2007.2 you need to add "tar" to the image types in your local.conf:

IMAGE_FSTYPES = "jffs2 tar"

After building a new image by issuing bitbake openmoko-devel-image there will be a OpenMoko-....tar in the deploy directory. Copy it on the SD card by doing

mount /dev/sda1 /mnt/moko
tar -C /mnt/moko/ -xvf openmoko-devel-image-fic-gta01-20070313022035.rootfs.tar

In OM-2007.2 the last built kernel gets a special soft-link. Therefore you can copy it by doing:

cp uImage-fic-gta01-latest.bin /mnt/moko/boot/uImage

Step 3: Add uboot boot entry

On my Phase-1 Neo the boot menu entry existed already. If yours is missing it follow those instructions: Start uboot in bootmenu mode (= hold AUX while powering on) and add the following entry via serial console: (See Bootloader section on how to access an bootloader).

GTA01Bv4 # setenv menu_4 Boot from SD: setenv bootargs root=/dev/mmcblk0p1 rootdelay=5 console=ttySAC0,115200 console=tty0 loglevel=8 \${mtdparts}\; mmcinit\; ext2load mmc 0 0x32000000 /boot/\${sd_image_name}\; bootm 0x32000000
GTA01Bv4 # setenv sd_image_name uImage
GTA01Bv4 # saveenv

You can now easily boot a different kernel by changing the variable sd_image_name to the new name.

Step 4: Boot into the new system

Power off your device, insert the SD card and boot into the boot menu. You should have an entry called "Boot from SD" which does exactly that. :-)