Re: [ECOS] Redboot/eCos memory usage

["R S" <rusingh at ecs dot umass dot edu>]

Hi:

Thanks a lot for your input.

The arena size is:
ARENA SIZE = 133956528 Bytes ~ 127.7 MB which is very close to the 128 that my
target has.
Also if ecos application has addresses ranging from 0xc00171e8 up to
0xc7fd1000, how can heap be that large. Doesn't this mean ecos app have approx
8MB of space.
What am I missing here???

I calculate arena size as follows:
--------------------
struct mallinfo minfo;
minfo = mallinfo();
diag_printf("ARENA SIZE = %d\n",minfo.arena);
----------------------------------------

heap symbol is defined in my mlt_arm...h file as:
-------------------------------------
#define CYGMEM_REGION_ram      (0xC0000000)
#define CYGMEM_REGION_ram_SIZE (0x08000000)
#define CYGMEM_REGION_ram_ATTR (CYGMEM_REGION_ATTR_R | CYGMEM_REGION_ATTR_W)

#ifndef __ASSEMBLER__
extern char CYG_LABEL_NAME (__heap1) [];
#endif

#define CYGMEM_SECTION_heap1 (CYG_LABEL_NAME (__heap1))
#define CYGMEM_SECTION_heap1_SIZE (0xC8000000 - (size_t) CYG_LABEL_NAME (__heap1))
-------------------------------------------

Thanks a ton!


Gary Thomas <gary@mlbassoc.com> said:

> On Sat, 2005-12-03 at 08:20 +0000, R S wrote:
> > Confused with eCos/Redboot memory layout structure.
> > 
> > 1. How can I find how much available memory my target has for eCos
applications.
> > My target.ld is as below:
> > 
> > MEMORY
> > {
> >     vrom : ORIGIN = 0x00000000, LENGTH = 0x00001000
> >     ram  : ORIGIN = 0xC0000000, LENGTH = 0x08000000
> > }
> > 
> > 2. How much of the ram is used by redboot? Below is the message I get on
> > booting redboot
> > 
> > RedBoot(tm) bootstrap and debug environment [ROM]
> > Non-certified release, version 2.00 - built 11:55:39, May 15 2002
> > 
> > Platform: BRH (XScale)
> > Copyright (C) 2000, 2001, 2002, Red Hat, Inc.
> > 
> > RAM: 0xc0000000-0xc8000000, 0xc00171e8-0xc7fd1000 available
> > FLASH: 0x00000000 - 0x00400000, 32 blocks of 0x00020000 bytes each.
> > 
> > How is it that the two address ranges overlap??
> 
> They don't - the first range indicates the total amount and the 
> second range is what's available for user/eCos programs.
> 
> > 
> > primarily, what I intend to do is reduce my heap size and use the available
> > memory to create another memory section. In my application, I used
> > mallinfo.arenasize to find initial heap size. It reported over 133MB size??
> 
> Are you sure?  I think you are confusing sizes here - 1MB = 1024*1024 
> bytes = 1048576 bytes, so your board has 128MB = 134217728 bytes total.
> 
> eCos programs can safely use any of the memory from 0xc00171e8 up to
> 0xc7fd1000 (the lower and upper edge regions are used by RedBoot).
> 
> > That appears really huge to me. Is this available for use entirely by eCos
> > application or does Redboot uses it too??
> > 
> > Thanks in advance
> > 
> > 
> -- 
> Gary Thomas <gary@mlbassoc.com>
> 



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