Le mardi 10 mars 2009 C 10:24 +0000, Stuart Henderson a C)crit : > I would look through a driver which was already converted and see what > was done. vr(4) doesn't look to be a bad choice, since it was done in > stages, so there are small commits you can look at (look at jason@'s > commits in October 2003).. > > http://www.openbsd.org/cgi-bin/cvsweb/src/sys/dev/pci/if_vr.c > > It will be easier to do this with the card in an i386 box so you can > test things in stages.
thanks for your help ! I had a look on manpages for bus_dma and I think I understood the basic idea : 1) actually, ste driver do direct I/O by reserving memory buffers (I don't really understand why it needs a virtual to physical translation but I guess it's not a real problem) 2) I need to replace these direct I/O access by DMA accesses using the bus_dma API. In particular, ste_newbuf must be rewritten, then every accesses using actually the memory pointer returned by vtophy have to be adapted using bus_dma* function. Am I right ? -- Eric Belhomme [demime 1.01d removed an attachment of type application/x-pkcs7-signature which had a name of smime.p7s]
