XUPV2P和Microblaze：BRAM太少了

我不是XUPV2P的专家，但我知道它有一个DDR SDRAM DIMM。
一般来说，嵌入式处理器有几种可能性：
- 直接从BRAM运行（就像你一样）
- 使用BRAM进行堆栈/堆并使用Flash运行处理器代码（由于性能问题通常不推荐）
http://www.xilinx.com/xlnx/xil_ans_display.jsp?iLanguageID=1&iCountryID=1&getPagePath=23748(8.1i EDK  - 如何直接从Flash执行MicroBlaze代码？）
- 使用BRAM进行堆栈/堆以及初始处理器引导加载程序。
然后，这将从非易失性存储器（例如闪存）复制较大的指令代码（太大而不适合可用的BRAM）到更快的存储器（例如DDR SDRAM）
我不认为你的电路板有闪光灯（它规定了我们的＃2和＃3）并且在SysACE中这样做可能不是一个简单的例子。
这带给我们下一个选择......
- 使用BRAM进行堆栈/堆和bootloop。
然后使用“dow”将你的精灵下载到SDRAM并从那里执行。
这可能是你最好的。
它将需要在上电后手动下载代码（相对于以前的方法，可以在设置后自动配置），但它已经完成并记录在案：
http://www.xilinx.com/univ/xupv2p_mem_ctrls.html
有关更详细的说明，请参阅示例文件中的doc文件。
祝你好运，
BT
==次要编辑
消息由timpe于09-26-2007 09:45 AM编辑



以下为原文

I'm not the expert on the XUPV2P, but I know it has a DDR SDRAM DIMM.Generally speaking, there are several possibilities for an embedded processor:-run directly from BRAM (as you've done) -use the BRAM for stack/heap and use Flash for running the processor code (not generally recommended because of performance issues)http://www.xilinx.com/xlnx/xil_ans_display.jsp?iLanguageID=1&iCountryID=1&getPagePath=23748 (8.1i EDK - How can I execute MicroBlaze code directly from flash?)
 -use the BRAM for stack/heap as well as initial processor bootloader. This would then copy the larger instruction code (too big to fit into available BRAM) from non-volatile storage (e.g. Flash) to faster memory (e.g. DDR SDRAM)  I don't think your board has flash (which rules our #2 and #3) and doing this across SysACE may not be the easist example. Which brings us to the next option... -use BRAM for stack/heap and bootloop. Then use "dow" to download your elf into SDRAM and execute from there. This is likely your best best. It will require manually downloading the code after power-up (versus the previous approach which could configure automatically once it has been setup), but it has already done and documented:http://www.xilinx.com/univ/xupv2p_mem_ctrls.htmlSee the doc file in the example files for a more detailed description. Good luck,bt == minor edit 

Message Edited by timpe on 09-26-2007 09:45 AM

非常感谢您的帮助！
西蒙娜



以下为原文

Thank you very much for your help! Simone