OESF Portables Forum

Model Specific Forums => Sharp Zaurus => Zaurus - pdaXrom => Topic started by: realm on July 20, 2007, 07:12:08 pm

Title: Zaurus Ide-cs Dma Support
Post by: realm on July 20, 2007, 07:12:08 pm

if i'm reading this reference document which says the pxa270 should support dma mode 0 1 at least.

http://www.xilinx.com/publications/xcellon...38_57-iwave.pdf (http://www.xilinx.com/publications/xcellonline/xcell_57/xc_pdf/p036-038_57-iwave.pdf)

right now hdparm -tT /dev/hda lists 1.7 Mb/sec transfer rates. no dma or 32 bit io. everytime i tried to enable 32 bit io my z crashed. everytime i tried to enable dma  (hdparm -d 1 /dev/hda) i got - HDIO_SET_DMA failed: Operation not permitted.

i'm going to keep googling about this, but has anyone out there got dma working on their z?

Title: Zaurus Ide-cs Dma Support
Post by: ernestus on July 20, 2007, 08:30:02 pm

Does the microdrive (or any other cf memory) support DMA transfers? I am not sure of that.

Cheers

Title: Zaurus Ide-cs Dma Support
Post by: pelrun on July 20, 2007, 09:01:31 pm

The CF interface is only 16-bit, so 32-bit transfers are out of the question. Additionally, the PXA270 dma lines arent connected to anything in the Z as far as I can tell (certainly not to the Scoop CF controllers) so DMA is unavailable too.

Title: Zaurus Ide-cs Dma Support
Post by: realm on July 23, 2007, 02:12:43 pm

the new 8 gig and 16 gig high end cf cards suport dma