misc patches and cleanup

I recently dabbled in u-boot and kept track of a few points I found confusing. I fixed them up to the best of my ability and created some patches for consideration.

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Dear Christopher Harvey,

Please read http://www.denx.de/wiki/U-Boot/Patches

These patches must be submitted one by one, each in a separate message. Make sure to provide useful commit messages that explain what you are doing and why, and make sure to include your signed-off-by lines.

Thanks.

Best regards,

Wolfgang Denk

DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
A wise person makes his  own  decisions,  a  weak  one  obeys  public
opinion.                                           -- Chinese proverb