some newbie questions

sebastian ssmoller sebastian.ssmoller at
Mon Feb 16 20:02:43 UTC 2004

On Mon, 16 Feb 2004 14:33:35 -0500
Ed Sutter <els at> wrote:

> Seb,
> I don't know too much about the ip450mon and the "lo" command;
> however,
> if it just dies, then it sounds like the srecord may be pointing to 
> space that is used by the monitor itself, and the download is
> corrupting
> RAM that is owned/used by the monitor in runtime.
> Is it possible that you have a conflict between the monitor and app
> memory maps?
> Ed

this could be possible. unfortunately i am still a beginner just
learning all that stuff about embedded programming and how the
compiler/linker works under the hood :)

what i know so far is that when we built our project/app with introl
code it generated the s19 in that way that the start address (used by
the "ca" command) was mapped to 700. i read in the docs that the memory
below 700 is used for internals (register memory maps, ...).

so in our linker command file we have something like this:
group ROM rom itemalign 2 origin 0x0700 maxsize 0x10000-0x0700;

i looked into the linkcmd files of the gen68360 bsp but havnt found
something like that. do i have to integrate this info into the "build
process" or does rtems already do it (implicitly by choosing the
correct bsp) ? how would i do that ?


> sebastian ssmoller wrote:
> > 
> > hi,
> > the hints u gave me so far helped me a lot. the last two days i read
> > some more docs about rtems and managed to build the hello world
> > sample
> > for pc386 and boot it via grub :)
> > 
> > then i build the hello world for gen68360 and tried to start it on
> > an ip
> > 460 developer board (68040 + 68360). unfortunately i wasnt able to
> > load
> > the file (s-record file) over the serial line :(
> > 
> > usually i would connect to the board (ip460mon) via terminal prog,
> > use
> > the "lo" command to download the s19 file and run "ca" to start the
> > prog. when i try "lo" with the hello world app nothing happens. i
> > mean:
> > i send the file and when finished the board usually answers "what ?"
> > but
> > it doesnt. i waited some minutes (10 min for 260k over 34800).
> > 
> > the only thing i found out so far is that usually the srec file has
> > s1
> > records (generated with introl code compiler) but the rtems objcopy
> > output has s2 records. i dont know whether it does matter (?)
> > 
> > i would expect that even if the output format is not correct the
> > download should just finish and possibly the "ca" would fail (?)
> > 
> > does anyone have any ideas ?
> > 
> > thx again
> > regards,
> > seb

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