Porting U-boot Michael Opdenacker Free Electrons

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Presentation transcript:

Porting U-boot Michael Opdenacker Free Electrons

Rights to copy © Copyright 2004-2009, Free Electrons feedback@free-electrons.com Document sources, updates and translations: http://free-electrons.com/docs/porting-u-boot Corrections, suggestions, contributions and translations are welcome! Latest update: 6/3/2018 Attribution – ShareAlike 3.0 You are free to copy, distribute, display, and perform the work to make derivative works to make commercial use of the work Under the following conditions Attribution. You must give the original author credit. Share Alike. If you alter, transform, or build upon this work, you may distribute the resulting work only under a license identical to this one. For any reuse or distribution, you must make clear to others the license terms of this work. Any of these conditions can be waived if you get permission from the copyright holder. Your fair use and other rights are in no way affected by the above. License text: http://creativecommons.org/licenses/by-sa/3.0/legalcode

Porting U-boot (1) It is relatively easy to port U-boot to a new board. This explains its success. Look for an already supported board which is as close as possible to yours. Create a new file in include/configs. For example, have a look at the adsvix.h file (pxa270 processor).

Porting U-boot (2) Then create support code in the board directory Example: have a look at board/adsvix: adsvix.c config.mk lowlevel_init.S Makefile pcmcia.c pxavoltage.S u-boot.lds You will find many similarities with board/lubbock.

Porting U-boot (3) Then, add your board to the following files: MAKEALL: LIST_pxa=" \ adsvix cerf250 cradle csb226 \ delta innokom lubbock pleb2 \ pxa255_idp wepep250 xaeniax xm250 \ xsengine zylonite \ Makefile: adsvix_config : unconfig @$(MKCONFIG) $(@:_config=) arm pxa adsvix include/asm-arm/mach-types.h: #define MACH_TYPE_ADSVIX 620 (originating from Linux headers, should already be present)

Other U-boot implementation details CPU support implemented in the cpu/ directory 74xx_7xx arm926ejs i386 mips mpc8260 nios sa1100 arm1136 arm946es ixp mpc5xx mpc83xx nios2 arm720t arm_intcm lh7a40x mpc5xxx mpc85xx ppc4xx arm920t at32ap mcf52x2 mpc8220 mpc86xx pxa arm925t bf533 microblaze mpc824x mpc8xx s3c44b0 Device drivers implemented in drivers/ A lot of reuse from Linux drivers! Headers implemented in include/ and in include/asm-<arch>/ (mostly Linux headers)