RTEMS + EPICS on Motorola MVME6100 ("Beatnik")

[Joel Sherrill]

On Tue, Mar 7, 2017 at 1:19 AM, Sebastian Huber <
sebastian.huber at embedded-brains.de> wrote:

> On 22/02/17 15:04, Michael Westfall wrote:
>
>> We are using RTEMS 4.10.2 + EPICS R3.14.12.4 for the beatnik and mvme2307
>> BSPs.
>>
>> What I've noticed is that the boot files created for the beatnik BSP are
>> more than twice the size of the boot files for the mvme2307. In some cases,
>> the boot file is too large for the "user download buffer" so the tftpGet
>> fails on startup.
>>
>> I realize that these two BSPs use different PPC CPUs (7400 vs. 604), but
>> I wonder why the great disparity in compiled file size.
>>
>
> I don't think the instruction set makes a big difference. I would look at
> the ELF file to figure out how the sections are placed and how big the are,
> e.g. objdump -h.
>
>
You can double check me on this but the motorola_powerpc family of BSPs
prepend a
bootloader to a compressed executable image. If the beatnik does not do
that, it could
easily be 2-4 times larger for exactly the same code.

--joel


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> Sebastian Huber, embedded brains GmbH
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