5.11 versus 4.42A Version 5.11 is the latest and preferred installation. It provides the latest features, program corrections, and device support. It does, however, lack support for for the ARM VFP (Vector Floating Point) coprocessor. Version 5.x support for VFP is planned for May 2008 (in version 5.20). Version 4.42A is provided to support customers that depends on support for VFP. If support for VFP is not critical, it is recommended to migrate to version 5.11.
More information can be found in the technical note 40394. ******************************************************************** 上面好像说5.11不支持矢量浮点运算（VFP），而4.42支持。这个VFP是做什么用的？
It does, however, lack support for for the ARM VFP (Vector Floating Point) coprocessor. 这句话是说，5.11暂时不支持矢量浮点协处理器，不是说不支持矢量浮点运算。后一句话说，计划到2008年5月的V5.20版开始支持矢量浮点协处理器。
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