Hi Kirill, >From the lspci output, it appears you have a PLX-9054. Told you it was popular! So the board has registers as follows: > Region 0: Memory at de600000 (32-bit, non-prefetchable) [size=256] PLX-specific control registers. This is where the DMA controller registers can be accessed. The PLX 9054 data sheet append lists all of these registers. > Region 2: Memory at de500000 (32-bit, non-prefetchable) [size=1M] > Region 3: Memory at de000000 (32-bit, non-prefetchable) [size=2M] These are two board specific memory regions. Assuming a 'signal processing controller' means that there is a DSP or processor on the board, then these two regions probably correspond to regions of the DSP/CPU memory map on the board. Do you have information on the memory map of these two regions? I can send you a driver that finds the PLX-9054 device and allows you to memory map these regions. I can also show how to mmap the two other regions - this allows programmed I/O from user space - good for checking things out. To perform DMA, you need to use 'kernel memory'. This is because the board DMA controller needs to move data to/from physical addresses. The kernel buffer can be obtained most easily with kmallocs, or you can use a user-space buffer and kiobuf. We can discuss either method once you confirm you have details of the memory map. Regards, Dave > -----Original Message----- > From: kernelnewbies-bounce@nl.linux.org > [mailto:kernelnewbies-bounce@nl.linux.org]On Behalf Of Kirill Messel > Sent: Wednesday, November 13, 2002 1:00 AM > To: David Hawkins; kernelnewbies@nl.linux.org > Subject: Re: DMA support > > > Hello David, > > I will try to be specific. > > I am writing a custom driver for our card. This is signal processing > controller. > > This is an information after lspci. > > 03:01.0 Signal processing controller: Unknown device 1819:0504 (rev 01) > Subsystem: PLX Technology, Inc.: Unknown device 9054 > Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- > Stepping- SERR- FastB2B- > Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- > <TAbort- <MAbort- >SERR- <PERR- > Latency: 32, cache line size 08 > Interrupt: pin A routed to IRQ 5 > Region 0: Memory at de600000 (32-bit, non-prefetchable) [size=256] > Region 2: Memory at de500000 (32-bit, non-prefetchable) [size=1M] > Region 3: Memory at de000000 (32-bit, non-prefetchable) [size=2M] > Expansion ROM at dd000000 [disabled] [size=64K] > Capabilities: <available only to root> > > In principle i have windows driver, but i can not understand how it works. > > Thanks > Kirill > > > > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
