Re: [Discuss-gnuradio] Using the USRP2 external SRAM
Thanks for the answer. I'm going to start working on it soon and then I'll come back here with the results (or with the problems :) 2009/6/15 Eric Blossom > On Wed, Jun 10, 2009 at 04:59:24PM -0300, Tiago Rogério Mück wrote: > > Hi all, > > > > I'm working on some experiments using the USRP2, and the 32 Kb available > for > > the firmware won't be enough for my experiments. I'll need to modify the > > FPGA code so I can use the 1 MB SRAM for both instructions and data for > the > > aeMB, but I'm a bit lost on how I can do this modifications. > > > > I looked the code and came to some conclusions about what needs to be > done: > > > > 1 - Change the memory map > > - Change the RAM space to 0 - 1 MB > > - Update the mapping of the buffer poll and the peripherals > > > > 2 - Change the logic inside the sys_ram block to forward access to > addresses > > beyond 32 K to the external SRAM > > > > 3 - Change the ram_loader parameters so it can load the entire firmware. > > > > Could someone tell me if I'm going to the right direction? I will be very > > grateful for any hint you can give me. > > Yes, this is the right direction. You'll probably want to include a > dcache to get any kind of throughput out of it. There's currently a > small icache. > > Eric > ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Using the USRP2 external SRAM
On Wed, Jun 10, 2009 at 04:59:24PM -0300, Tiago Rogério Mück wrote: > Hi all, > > I'm working on some experiments using the USRP2, and the 32 Kb available for > the firmware won't be enough for my experiments. I'll need to modify the > FPGA code so I can use the 1 MB SRAM for both instructions and data for the > aeMB, but I'm a bit lost on how I can do this modifications. > > I looked the code and came to some conclusions about what needs to be done: > > 1 - Change the memory map > - Change the RAM space to 0 - 1 MB > - Update the mapping of the buffer poll and the peripherals > > 2 - Change the logic inside the sys_ram block to forward access to addresses > beyond 32 K to the external SRAM > > 3 - Change the ram_loader parameters so it can load the entire firmware. > > Could someone tell me if I'm going to the right direction? I will be very > grateful for any hint you can give me. Yes, this is the right direction. You'll probably want to include a dcache to get any kind of throughput out of it. There's currently a small icache. Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Using the USRP2 external SRAM
Hi all, I'm working on some experiments using the USRP2, and the 32 Kb available for the firmware won't be enough for my experiments. I'll need to modify the FPGA code so I can use the 1 MB SRAM for both instructions and data for the aeMB, but I'm a bit lost on how I can do this modifications. I looked the code and came to some conclusions about what needs to be done: 1 - Change the memory map - Change the RAM space to 0 - 1 MB - Update the mapping of the buffer poll and the peripherals 2 - Change the logic inside the sys_ram block to forward access to addresses beyond 32 K to the external SRAM 3 - Change the ram_loader parameters so it can load the entire firmware. Could someone tell me if I'm going to the right direction? I will be very grateful for any hint you can give me. Thanks ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
