----- Original Message ----- >Date: Sun, 31 Aug 2008 21:25:52 -0500 >From: Steven Stallion <[EMAIL PROTECTED]> >To: [email protected] >Cc: "Garrett D'Amore" <[EMAIL PROTECTED]> >Subject: [driver-discuss] DP8390 single-bus DMA alignment > > >All, > >I'm having some problems getting DMA to align appropriately for the >DP8390. The DP8390's DMA engine is programmed with the upper 16 bits in >single bus mode (single 32-bit DMA). > >After reading the documentation for ddi_dma_attr_t, it looks like >dma_attr_sgl can be used to accomplish this, however I can't seem to get >dma_cookie_t.dmac_address to align correctly: > > >static ddi_dma_attr_t ne_dma_attr = { > DMA_ATTR_V0, /* dma_attr_version */ > 0, /* dma_attr_addr_lo */ > 0xffffffff, /* dma_attr_addr_hi */ > 0xffffffff, /* dma_attr_count_max */ > 1, /* dma_attr_align */ > 0x1f, /* dma_attr_burstsizes */ > 1, /* dma_attr_minxfer */ > 0xffffffff, /* dma_attr_maxxfer */ > 0xffff, /* dma_attr_sgl */ > 1, /* dma_attr_sgllen */ > 1, /* dma_attr_granular */ > 0 /* dma_attr_flags */ >}; > >dmac.dma_address is: 0xc0190040. > >Any ideas? > >Steve
I don't think you need dma attribute for dp8390. DP8390 doesn't have dma capability. The remote dma capability in the datasheet, means to access the internal ram in DP8390 internal bus from outside, i.e, sparc or i86 cpu. Typical NE2000 compatible cards implements the remote dma with IO instructions from ISA or PCI bus, that is exactly same with PIO we call now. -masa _______________________________________________ >driver-discuss mailing list >[email protected] >http://mail.opensolaris.org/mailman/listinfo/driver-discuss _______________________________________________ driver-discuss mailing list [email protected] http://mail.opensolaris.org/mailman/listinfo/driver-discuss
