Booting Omap3/Omap4 via OTG

Requirements

• Beagle/BeagleXM/Panda development platform
• USB Mini Cable
• abootimg (from universe)

• gcc & gcc-arm-linux-gnueabi (if building on non-armel platform)

• omap4boot

  • Original code: https://github.com/swetland/omap4boot

  • Fix for USB support: https://github.com/rsalveti/omap4boot

  • package coming to universe soon - Oneiric?
• kernel
• ramdisk image

Setup

• Download the headless image for omap/omap4 and gunzip it.
• loop mount the image to a local directory to pull the kernel, ramdisk, and boot script
  • mkdir mnt; sudo mount ubuntu-11.04-preinstalled-headless-armel+omap4.img mnt -o loop,offset=$((512*63))
  • cp mnt/uI* mnt/boot.scr .
  • sudo umount mnt
• Install abootimg
• Strip the u-boot header from the kernel, initrd, and boot script.

  • dd bs=1 skip=64 if=uImage of=vmlinuz # Do the same for uInitrd & boot.scr, using initrd.img and boot.script for outfile

• Create an abootimg config file

     echo > boot.cfg <EOF
     bootsize    = 0x8e1000
     pagesize    = 0x800
     kerneladdr  = 0x80008000
     ramdiskaddr = 0x81000000 
     tagsaddr    = 0x80000100
     name        = Ubuntu Boot Img
     cmdline = vram=32M mem=456M@0x80000000 mem=512M@0xA0000000 root=/dev/sda1 fixrtc quiet splash \
               debian-installer/framebuffer=false console=ttyO2,115200n8
     EOF

• note: Use the cmdline from the boot.script and change the location of the root file system

• Create a boot image.
  • abootimg --create boot.img -f boot.cfg -k vmlinuz -r initrd.img
• Build omap4boot
  • cd omap4boot
  • make TOOLCHAIN=arm-linux-gnueabi-
• Start usbboot on host pc
  • ./omap4boot/out/panda/usbboot boot.img
• Power on platform with serial cable attached and mini-USB cable attached to host. platform should pull from usb and start booting.

Known Issues

• abootimg broken on amd64 platform (lp:784336)
• usbboot exits after downloading image
  • work is being done to enable daemon mode
• doesn't support omap3 - WIP
• usb ports and network port not enabled on panda - fixed in rsalveti's source tree above.
• mmc not enabled on panda
• software reset doesn't work (sudo reboot).
• above process doesn't fully work (more steps needed to get headless working from USB).