请问按照yocto工程编译的时候选择machine怎么选?编译image时,目标如何选择? 
machine有如下选型: 
imx6qsabresd 
• imx6qsabreauto 
• imx6dlsabresd 
• imx6dlsabreauto 
• imx6solosabreauto 
• imx6slevk 
• imx6sxsabresd 
• imx6sxsabreauto 
image目标有如下选项: 
  meta               
meta-yocto        = "(nobranch):30b8d9378b8260e452552b806610dc9b6fe0b69f" 
meta-oe           = "(nobranch):8065dd8456913457a0114ddb2b4bd4842847b2a3" 
meta-fsl-arm      = "(nobranch):9bc540eec9a7e280af13371ea70650fcc47ea627" 
meta-fsl-arm-extra = "(nobr 
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