User:Parasense/arm

OMAP5 uEVM notes

Fedora 20 uENV.txt:

setenv bootm_size 0x20000000
setenv bootargs console=${console} vram=${vram} root=LABEL=_/ ro rootwait rhgb
ext4load mmc 0:3 0x82000000 /boot/vmlinuz-3.14.0-0.rc6.git4.1.fc21.armv7hl
ext4load mmc 0:3 0x88080000 /boot/uInitrd-3.14.0-0.rc6.git4.1.fc21.armv7hl
ext4load mmc 0:3 0x88000000 /boot/dtb-3.14.0-0.rc6.git4.1.fc21.armv7hl/omap5-uevm.dtb
bootz 0x82000000 0x88080000 0x88000000

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Fedora 21/rawhide notes

Install MLO and u-boot on non-vfat image: WARNING: BETA NOTES

sudo dd if=MLO           \
        of=/dev/sdz      \
      conv=fsync,notrunc \
      seek=128k

sudo dd if=u-boot.img    \
        of=/dev/sdz      \
     count=2             \
      seek=1             \
      conv=notrunc,fsync \
        bs=384k

F20 notes

• download the f20 minimal image

wget http://download.fedoraproject.org/pub/fedora/linux/releases/20/Images/armhfp/Fedora-Minimal-VFAT-armhfp-20-1-sda.raw.xz

• Decompress

unxz -v Fedora-Minimal-VFAT-armhfp-20-1-sda.raw.xz

• Map the partitions

kpartx -avp _fedora_  Fedora-Minimal-VFAT-armhfp-20-1-sda.raw

• Extract the rootfs

dd if=/dev/mapper/loop0_fedora_3 \
   of=f20-minimal-rootfs.ext4    \
 conv=fsync

• Unmap the partitions

kpartx -dvp _fedora_  Fedora-Minimal-VFAT-armhfp-20-1-sda.raw

• Optionally discard the official Fedora minimal image, we now have the essential rootfs.

• Shrink the rootfs image file

e2fsck    -f  f20-minimal-rootfs.ext4 &> /dev/null
resize2fs -M  f20-minimal-rootfs.ext4

• Create a new f20 disk image file

truncate -s 4G f20-minimal.disk

• Partition the newly created disk image

parted -a    optimal 
       -s -- f20-minimal.disk      \
             unit MiB              \
             mklabel msdos         \
             mkpart primary 4 24   \
             mkpart primary 24 152 \
             mkpart primary 152 -1 \
             print

• Map the partitions to loop devices

kpartx -avp _remix_ f20-minimal.disk

• Format the partitions accordingly to the output of the previous kpartx cmd.

mkfs.vfat -n uboot -F 16              /dev/mapper/loop0_remix_1

mkswap -L swap -U $(uuidgen)          /dev/mapper/loop0_remix_2

#mkfs.ext4 -L rootfs -U $(uuidgen) -m0 /dev/mapper/loop0_remix_3

• Copy the Fedora-20 minimal rootfs to the appropriate partition

dd if=f20-minimal-rootfs.ext4   \
   of=/dev/mapper/loop0_remix_3 \
   bs=4M conv=fsync 

• Inflate the rootfs on the partition

resize2fs -fp /dev/mapper/loop0_remix_3

• Unmap the partition loops devs

kpartx -dvp _remix_ f20-minimal.disk

Tips & Tricks

You can monitor the DD command in an easy one liner.

dd if=/dev/sdc3 of=f20-minimal-rootfs.ext4-ORIG &   while ps -p $! ; do kill -USR1 $! ; sleep 5 ; done

This signals the DD process to spew progress info every five seconds. Especially useful on very slow sdcard, or large data transfers.

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