[En-Nut-Discussion] ARM MMC Boot Problem

[Ole Reinhardt]

Hi Harald,

> mmcloader seems to work fine too. Otherwise httpserv won't come that
> far, being able to respond to the first one or two HTTP requests, right?

I also had problems using a bootloader. Perhaps at the end this results
from the same problem.

I have a (serial) bootloader, which itself is a NutOS Application linked
to the start of flash. I have my user application linked to offset 64K
into the flash by modifying the startup code and linker script.

My application works fine as long as the .bss and / or .data segment
does not become larger than somewhat around 6000+x bytes. If it grows
larger than this magic threshold my application just freezes if the
bootloader jumps into it. No output at all... If I remove some global
variables so that the bss / data segment is smaler like this threshold
the application works like a charme. So I just have to allocate the
needed ram on the heap instead using global variables.

As I absolutely don't know the reason of this problem I can't tell you
if there is a common reason, but perhaps a starting point for further
investigations.

Bye,

Ole

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| Embedded-IT                                                 |
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