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<DIV><FONT face=Verdana color=#0000ff size=2>Hi John,</FONT></DIV>

<DIV><FONT face=Verdana color=#0000ff size=2></FONT>&nbsp;</DIV>

<DIV><FONT face=Verdana color=#0000ff size=2>Did you use DMA driver in our FEC 

driver before?</FONT></DIV>

<DIV><FONT face=Verdana size=2></FONT>&nbsp;</DIV>

<DIV><FONT face=Verdana color=#0000ff size=2>Best Regards,</FONT></DIV>

<DIV align=left>

<DIV align=left><FONT face=Verdana size=2>

<HR style="WIDTH: 122px; HEIGHT: 2px" SIZE=2>

</FONT></DIV>

<DIV><FONT color=#c0c0c0><FONT face=Verdana size=2>Hongjun Chen</FONT></DIV>

<DIV><FONT face=Verdana size=2>2009-05-20</FONT></FONT></DIV></DIV>

<DIV><FONT face=Verdana size=2>

<HR>

</FONT></DIV>

<DIV><FONT face=Verdana><FONT size=2><STRONG>发件人：</STRONG> Piotr 

Zięcik</FONT></FONT></DIV>

<DIV><FONT face=Verdana><FONT size=2><STRONG>发送时间：</STRONG> 

2009-05-19&nbsp;16:05:05</FONT></FONT></DIV>

<DIV><FONT face=Verdana><FONT size=2><STRONG>收件人：</STRONG> Hongjun 

Chen</FONT></FONT></DIV>

<DIV><FONT face=Verdana><FONT size=2><STRONG>抄送：</STRONG> Wolfgang Denk; 

linuxppc-dev@ozlabs.org</FONT></FONT></DIV>

<DIV><FONT face=Verdana><FONT size=2><STRONG>主题：</STRONG> Re: [PATCH 11/12] 

mpc5121: Added MPC512x DMA driver.</FONT></FONT></DIV>

<DIV><FONT face=Verdana size=2></FONT>&nbsp;</DIV>

<DIV><FONT face=Verdana size=2>

<DIV>Tuesday&nbsp;19&nbsp;May&nbsp;2009&nbsp;03:37:47&nbsp;Hongjun&nbsp;Chen&nbsp;wrote:</DIV>

<DIV>&gt;&nbsp;Since&nbsp;you&nbsp;have&nbsp;reuse&nbsp;most&nbsp;part&nbsp;of&nbsp;our&nbsp;BSP,&nbsp;why&nbsp;should&nbsp;you&nbsp;reinvent&nbsp;wheel</DIV>

<DIV>&gt;&nbsp;for&nbsp;MPC512x&nbsp;DMA?&nbsp;We&nbsp;have&nbsp;one&nbsp;ready&nbsp;DMA&nbsp;driver,&nbsp;which&nbsp;has&nbsp;been&nbsp;used&nbsp;by&nbsp;AC97,</DIV>

<DIV>&gt;&nbsp;ATA,&nbsp;VIU&nbsp;etc.</DIV>

<DIV>&gt;</DIV>

<DIV>&nbsp;</DIV>

<DIV>Answer&nbsp;is&nbsp;simple.&nbsp;The&nbsp;old&nbsp;one&nbsp;does&nbsp;not&nbsp;fit&nbsp;Linux&nbsp;DMA&nbsp;API.&nbsp;New&nbsp;one&nbsp;uses&nbsp;</DIV>

<DIV>existing&nbsp;infrastructure&nbsp;which&nbsp;makes&nbsp;DMA&nbsp;engine&nbsp;aviable&nbsp;for&nbsp;existing&nbsp;consumers</DIV>

<DIV>in&nbsp;Linux&nbsp;kernel.&nbsp;For&nbsp;example&nbsp;network&nbsp;stack.&nbsp;Support&nbsp;for&nbsp;I/O&nbsp; 

&lt;- &gt;&nbsp;memory&nbsp;</DIV>

<DIV>transfers&nbsp;will&nbsp;be&nbsp;added&nbsp;when&nbsp;more&nbsp;consumers&nbsp;arrive.</DIV>

<DIV>&nbsp;</DIV>

<DIV>--&nbsp;</DIV>

<DIV>Best&nbsp;Regards.</DIV>

<DIV>Piotr&nbsp;Zięcik</DIV></FONT></DIV></BODY></HTML>