4.14.6.1. chumbyone Chumby Industrie’s Falconwing

This device is also known as “chumby one” (http://www.chumby.com/)

This CPU card is based on a Freescale i.MX23 CPU. The card is shipped with:

• 64 MiB synchronous dynamic RAM (DDR type)

Memory layout when barebox is running:

• 0x40000000 start of SDRAM
• 0x40000100 start of kernel’s boot parameters
  • below malloc area: stack area
  • below barebox: malloc area
• 0x42000000 start of barebox

4.14.6.1.1. How to get the bootloader binary image

Using the default configuration:

make ARCH=arm chumbyone_defconfig

Build the bootloader binary image:

make ARCH=arm CROSS_COMPILE=armv5compiler

NOTE: replace the armv5compiler with your ARM v5 cross compiler.

4.14.6.1.2. How to prepare an MCI card to boot the “chumby one” with barebox

• Create four primary partitions on the MCI card
  • the first one for the bootlets (about 256 kiB)
  • the second one for the persistant environment (size is up to you, at least 256k)
  • the third one for the kernel (2 MiB … 4 MiB in size)
  • the fourth one for the root filesystem which can fill the rest of the available space
• Mark the first partition with the partition ID “53” and copy the bootlets into this partition (currently not part of barebox!).
• Copy the default barebox environment into the second partition (no filesystem required).
• Copy the kernel into the third partition (no filesystem required).
• Create the root filesystem in the fourth partition. You may copy an image into this partition or you can do it in the classic way: mkfs on it, mount it and copy all required data and programs into it.