http://forums.leaflabs.com/topic.php?id=670 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:13:59 +0000 http://bbpress.org/?v=1.0.2 q http://forums.leaflabs.com/search.php http://forums.leaflabs.com/topic.php?id=670#post-6446 Tue, 20 Sep 2011 17:07:59 +0000 mbolivar 6446@http://forums.leaflabs.com/ <p>yes</p> <p><strong>Update</strong> I imagine that since the heap works now, these sorts of questions will be on a lot of people's minds. I've updated the FAQ to cover this: <a href="http://leaflabs.com/docs/faq.html#how-can-i-use-malloc-new" rel="nofollow">http://leaflabs.com/docs/faq.html#how-can-i-use-malloc-new</a> </p> http://forums.leaflabs.com/topic.php?id=670#post-6432 Tue, 20 Sep 2011 14:12:07 +0000 kqr2 6432@http://forums.leaflabs.com/ <p>Nice. Are statically allocated variables and stack still stored in on-chip ram for faster access? </p> http://forums.leaflabs.com/topic.php?id=670#post-6429 Tue, 20 Sep 2011 13:53:06 +0000 mbolivar 6429@http://forums.leaflabs.com/ <p>the heap is located on the external SRAM chip by default. no linker script modifications should be necessary. </p> http://forums.leaflabs.com/topic.php?id=670#post-6428 Tue, 20 Sep 2011 13:50:36 +0000 kqr2 6428@http://forums.leaflabs.com/ <p>Now that the Maple Native is available, has anyone tried compiling to external RAM or using it for heap? Is it possible to do this by modifying the linker script?</p> <p>My code seems to get bigger by the day, so the ability to use off chip RAM seamlessly would be great. </p> http://forums.leaflabs.com/topic.php?id=670#post-3796 Tue, 01 Mar 2011 19:24:58 +0000 mbolivar 3796@http://forums.leaflabs.com/ <p>Err, typo: It's an IS62WV51216BLL (note the "6" before the "BLL") </p> http://forums.leaflabs.com/topic.php?id=670#post-3794 Tue, 01 Mar 2011 18:46:22 +0000 gbulmer 3794@http://forums.leaflabs.com/ <p>Great!<br /> We'd like to run a LISP system, so RAM is the best answer :-) </p> http://forums.leaflabs.com/topic.php?id=670#post-3789 Tue, 01 Mar 2011 16:43:21 +0000 mbolivar 3789@http://forums.leaflabs.com/ <p>The memory chip on the Native is an ISSI IS62WV5121BLL, 44-pin TSOP type, organized in to 512K 16 bit words. It's a PSRAM chip with a 55ns access time.</p> <p>The Cortex M3 memory map specifies that the external RAM region (which the FSMC maps the chip into) is executable. However, I don't think I could give you an honest estimate of the performance impact, specifically because I don't know the penalty paid for sacrificing parallel instruction and data fetches.</p> <p>If we support loading code into the memory chip, we'll definitely fully support it from both the command line and the IDE. It would be nice for RAM builds to be a useful thing again :). </p> http://forums.leaflabs.com/topic.php?id=670#post-3783 Tue, 01 Mar 2011 12:45:01 +0000 gbulmer 3783@http://forums.leaflabs.com/ <p>I'd like to know what kind of external memory LeafLabs are planning to put onto Maple Native's Flexible Static Memory Controller (FSMC)?<br /> Is it some form of flash, RAM, or both?</p> <p>Will it be possible to execute code directly from the external, FSMC attached, memory?<br /> If Maple Native can run code from it, have you an estimate for the performance impact?</p> <p>Does LeafLabs intend to make it possible to load code straight into the FSMC memory from the IDE, or will that process be command line/Makefile only? </p>