Thanks again Ed. This is a really good idea. It is entirely possible that some other complication in Linux is getting to me. So, with that in mind, I'm off to uboot for a while to see if I can convince myself the rest of the chips are setup correctly on the board. Charles
________________________________ From: Swarthout Edward L-SWARTHOU [mailto:[EMAIL PROTECTED] Sent: Fri 3/2/2007 1:27 PM To: Charles Krinke; [email protected] Subject: RE: DMA take 3 Maybe even a more basic question - are you setting the controller up correctly for this mode (SRW=1 and CTM=1)? One suggestion is to try it once by hand in u-boot to ensure the hardware is working as expected before trying it in Linux. -EdS #simple u-boot Direct Mode dma example - Ed.Swarthout setenv sad fff80000 #source setenv dad 10000 #dest setenv bc 10 #byte count setenv b e0021 #ccsr mw ${b}104 ffffffff #sr clear mw ${b}110 50000 #satr SREADTTYPE=5 read snoop mw ${b}114 $sad #sar mw ${b}118 50000 #datr write snoop mw ${b}120 $bc #bcr mw ${b}100 0f03c404 #mr BWC=f, DAHTS=3, SAHTS=3, SRW=1 CTM md $dad 5 #before mw ${b}11c $dad #set dar and go md ${b}100 9 #show status md $dad 5 #after Or make a dma command and run it: setenv dma 'mw ${b}104 ffffffff;mw ${b}110 50000;mw ${b}114 $sad;mw ${b}118 50000;mw ${b}120 $bc;mw ${b}100 0f03c404; mw ${b}11c $dad; md ${b}100 9' setenv b e0021; setenv sad fff80000; setenv dad 10000; setenv bc 10 run dma --- results --- => md $dad 5 md $dad 00010000: deadbeef deadbeef deadbeef deadbeef ................ 00010010: deadbeef .... => run dma run dma e0021100: 0f03c405 00000000 00000000 00000000 ................ e0021110: 00050000 fff80010 00050000 00010010 ................ e0021120: 00000000 .... => md $dad 5 md $dad 5 00010000: 27051956 552d426f 6f742031 2e322e30 '..VU-Boot 1.2.0 00010010: deadbeef .... _______________________________________________ Linuxppc-embedded mailing list [email protected] https://ozlabs.org/mailman/listinfo/linuxppc-embedded
