LeafLabs Garden

A place to share, learn, and grow...

1. 

   barrybrown
   Member

   Hi all,

   New to Maple. I'm interested in using the Maple as a generic computer: just a processor, RAM, ROM, and console I/O. I've been starting out with the libmaple examples using the command-line toolchain.

   How much storage does libmaple use? How much will be left over for my own programs?

   For my experiments, I don't need most of libmaple; I just need the SerialUSB routines (or their C library equivalents, such as putchar, getchar, and printf). Where can I find information about stripping down libmaple to just the essentials?

   That probably leaves me with one final question: do I even need libmaple at all? Can I do console I/O through the USB serial port without it?

   Thanks for your help! I look forward to reporting on what I'm up to when I get it working. :)

   Posted 3 years ago #
2. 

   ala42
   Member

   Unused libmaple code is not added to the linked binary file.
   What makes you think your code will not fit into the available flashrom ?

   Posted 3 years ago #
3. 

   barrybrown
   Member

   Somewhere in the docs, I thought I saw that the libraries needed to be statically compiled. I may be misremembering, however.

   If I create an empty main.cpp, I end up with an ELF file that is about 59K in size, of which about 46K is executable code:

   
Final Size:
text data bss dec hex filename
46876 3004 9216 59096 e6d8 build/maple.elf


   What's all the code if I'm calling none of it?

   Posted 3 years ago #
4. 

   mbolivar
   LeafLabs

   What's all the code if I'm calling none of it?

   Interesting question. Off the top of my head: IRQ handlers, _start, start_c(). Check the disassembly in build/maple.disas to find out more!

   If you're interested in stripping the library down, it sounds like you're already well along in getting the tools together to figure out what's going on inside the final binary. Try building in verbose mode and reading the binutils documentation to find out more.

   Posted 3 years ago #
5. 

   mbolivar
   LeafLabs

   If I create an empty main.cpp, I end up with an ELF file that is about 59K in size

   That's also curious. When I leave main.cpp empty, I get link errors, since main() (which start_c() calls) is undefined. Did you really mean an empty main.cpp? Perhaps you meant a "trivial" main.cpp, which still does things like call init(), like all of our example code does. If you call init(), you have to pay for it.

   Posted 3 years ago #

RSS feed for this topic

Reply

You must log in to post.