http://forums.leaflabs.com/topic.php?id=74405 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:04:55 +0000 http://bbpress.org/?v=1.0.2 q http://forums.leaflabs.com/search.php http://forums.leaflabs.com/topic.php?id=74405#post-105605 Sun, 04 Jan 2015 17:49:36 +0000 bobc 105605@http://forums.leaflabs.com/ <p>Sure, that makes sense for a RAM build, the bootloader must load it into RAM while the bootloader is running.</p> <p>I can't see why a Flash build would need the same behaviour though. </p> http://forums.leaflabs.com/topic.php?id=74405#post-105604 Sun, 04 Jan 2015 14:16:54 +0000 gbulmer 105604@http://forums.leaflabs.com/ <p>I have a <em>very vague</em> recollection that reserving some RAM allowed the bootloader to be triggered by a reset, without disturbing a program loaded into RAM. So that RAM-resident program could be reentered repeatedly via a reset to the bootloader. </p> <p>But I can't find any reference that look familiar enough to explain why I think that, so I may be wrong. </p> http://forums.leaflabs.com/topic.php?id=74405#post-105602 Sun, 04 Jan 2015 06:55:18 +0000 bobc 105602@http://forums.leaflabs.com/ <p>I'm working on port of libmaple into Arduino 1.5.x IDE environment. This is going quite well, but there is one question I am puzzling over.</p> <p>Namely, in the link script (e.g. mem-flash.inc), the first part of RAM (0xC00 bytes) is reserved (presumably for the bootloader). I don't see why this is necessary, the bootloader and application will always initialise RAM in their startup code, and as far as I can see there is no communication between bootloader and application via RAM that would need RAM contents to be preserved.</p> <p>Perhaps there is a reason somewhere I haven't spotted, but I will try changing it to see what happens.</p> <p>I'd also like to reduce the amount of Flash used by the bootloader, but that is another topic! </p>