On Fri, Aug 14, 2009 at 3:14 PM, Philip Balister<philip@xxxxxxxxxxxx> wrote: > John Sarman wrote: >> >> On Thu, Aug 13, 2009 at 9:29 AM, Elvis Dowson<elvis.dowson@xxxxxxx> wrote: >>> >>> Hi John, >>> >>> On Aug 13, 2009, at 5:14 PM, John Sarman wrote: >>> >>>> >>>> <snip from omap 35xx page> >>>> General Purpose Memory Controller (GPMC) >>>> >>>> * 16-bit Wide Multiplexed Address/Data Bus >>>> * Up to 8 Chip Select Pins With 128M-Byte Address Space per Chip Select >>>> Pin >>>> * Glueless Interface to NOR Flash, NAND Flash (With ECC Hamming >>>> Code Calculation), SRAM and Pseudo-SRAM >>>> * Flexible Asynchronous Protocol Control for Interface to Custom >>>> Logic (FPGA, CPLD, ASICs, etc.) >>>> * Nonmultiplexed Address/Data Mode (Limited 2K-Byte Address Space) >>>> </snip from omap 35xx page> >>> >>> Thanks for the info, I've read that section on the GPMC. I'm going to >>> attempt this in stages. First I'll implement a simple protocol between >>> the >>> OMAP and the FPGA, e.g. use GPIOs to signal read and write operations, >>> and >>> the serial UART0 to transfer data to a memory location for the FPGA to >>> process and return the result. >>> >>> Since the TI OMAP uses 1.8v signalling, I can directly interface it with >>> the >>> Virtex-5 and get a simple prototype up and running. >>> >>> After that, create a TI OMAP GPMC to PLB v4.6 Bus Bridge, to make the >>> GPMC >>> requests appear in the FPGA PLB bus, so that it can access the FPGA >>> devices >>> and peripherals connected to the PLB bus. I'm using the gumstix Overo for >>> these tests, and the GPMC signals are not available on the Palo43 or >>> summit >>> expansion boards. It is available on the Overo J4/J6 connector though, >>> but >>> that needs a custom board to bring those signals out. >>> >>> Do you know if any other TI OMAP 35xx development board exposes the GPMC >>> connectors? I just want to finish the software/firmware part before >>> starting >>> work on a custom expansion board. >> >> >> I had to build a custom board for my project, I would recommend taking >> that approach if possible. > > Gumstix Overo? Yeah using the Overo. I whipped up a board with 4 port USB Host, 1 OTG, the smsc911x ethernet controller. and msp430 to control some peripherials, 3rd MMC, etc, etc. My favorite part was the 70 Watt dual power supply (5V,3.3V). The gumstix uses about 1-2 watts so a little overkill on the supply, but it can cook right through a pencil lead :) Gumstix site has excellent docs to be able to build an expansion board. Makes more sense with these fine pitch connectors to build a proper test board rather than try to bread board up two demo boards. John > > Philip > -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
