History 8xxROM by Magnus Damm PPCBoot (1999) – v 0.4.1 (2000) U−Boot−0.1.0 (2002) extended functionality, new architectures Das U-Boot.

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Presentation transcript:

History 8xxROM by Magnus Damm PPCBoot (1999) – v (2000) U−Boot−0.1.0 (2002) extended functionality, new architectures Das U-Boot

What is Das U-Boot Universal Bootloader MIPS, NIOS, ARM, PowerPC... allows: bring-up development debugging finished system boot-loader

Why Das U-Boot serial console support integrated shell-like setup interface optional password protection and timeout for access to setup interface on boot editable configuration space capable of booting through TFTP, SCSI, IDE etc. range of file systems supported runs test applications directly boots Linux

How it works $ git clone git://git.denx.de/u-boot.git for igepv2: $ wget $ make gta01_config $ make CROSS_COMPILE=arm-none-linux-gnueabi- (igep0020_config) $ make ARCH=arm CROSS_COMPILE=arm-angstrom-linux-gnueabi- u-boot.udfu $ make CROSS_COMPILE=arm-none-linux-gnueabi-

How it works u-boot.map- The symbol map u-boot - U-Boot executable in ELF binary format u-boot.bin - U-Boot raw binary image, which can be written to the boot storage device u-boot.udfu- U-Boot image in the special U-Boot Device Firmware Upgrade (DFU) file format used by the OpenMoko devices

How it works U-Boot rc2-dirty-moko12 (Mar :40:43) I2C: ready DRAM: 128 MB NAND: 64 MiB Found Environment offset in OOB.. Video: 640x480x8 31kHz 59Hz NAND read: device 0 offset 0x25c000, size 0x5000 Reading data from 0x260e % complete bytes read: OK USB: S3C2410 USB Deviced In: serial Out: serial Err: serial GTA01Bv4 #

How it works GTA01Bv4 # GTA01Bv4 # help ? - alias for 'help' askenv - get environment variables from stdin autoscr - run script from memory base - print or set address offset bdinfo - print Board Info structure bmp - manipulate BMP image data boot - boot default, i.e., run 'bootcmd'

Why not... GRUB? No “monitor” capabilities Requires x86-based host Makefiles not built for cross-compilation Hot off the press... added last night!

More Info on Das U-Boot Building Embedded Linux Systems, Karim Yaghmour, Jon Masters, Gilad Ben-Yossef and Philippe Gerum Documentation on the web (14 chapters):