- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hello everybody,
I have an EBV SoCrates Board (Cyclone V) with me. I want to devide the external DDR3 memory into 3 partiions. One partition for linux/hps, one partition for the fpga and a third 'swap' partition with access from FPGA and linux. Can anyone please give me a hint where and how to configure it? The icing on the cake would be a working tutorial or a demo project. Thanks in advance Greetings GuineaLink Copied
3 Replies
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Try having a look at http://www.rocketboards.org/foswiki/view/projects/myfirstmodule to see an example driver for creating an area of memory in the HPS SDRAM that the FPGA can access via the H2F SDRAM port.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
@DaveHorne
Thank you very much for your help... but the topic I was searching for is described in: Cyclone 5 device handbook, catchwords are: SDRAM Controller Subsystem, Memory Protection. Now I'm trying to figure out how to set up the protection rules ... unfortunately the documentation is not as good as expected - this often leads to trial and error developement :( cheers guinea- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hi Guinea, I managed to create 2 partitions on the HPS SDRAM - 1 for the Linux operating system, the other for exclusive use by the FPGA. You can take a look at: https://support.criticallink.com/redmine/projects/mityarm-5cs/wiki/writing_to_hps_memory for an excellent tutorial on how to do this. The magic is in setting the bootloader argument as follows:
- setenv mmcboot 'setenv bootargs console=ttyS0,115200 root=${mmcroot} rw rootwait mem=512M;bootz ${loadaddr} - ${fdtaddr}'
- saveenv

Reply
Topic Options
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page